Some standard content:
QB/T 2199-1996
This standard is a revision of QB364--1981 "Hard Steel Paperboard" according to GB/T1.1-1993 "Guidelines for Standardization Work Unit 1: Rules for Drafting and Presenting Standards Part 1: Basic Regulations for Standard Writing". In order to adapt to the actual situation of my country's steel paper industry and meet the application of steel paperboard in various industries, the following revisions have been made on the basis of the original standard: This standard adopts the former Soviet Union FOCT11945-1978 standard in a non-equivalent manner. According to GB/T1.22-1993 "Guidelines for Standardization Work Unit 2: Methods for Determining Standard Contents Part 22: Provisions for Reference Standards", a reference standard is added to this standard. - Technical indicators use legal measurement units. - Adhesion coefficient is changed to interlayer peeling strength. Volume resistivity and breakdown voltage strength are changed to GB/T1410 "Test Method for Volume Resistivity and Surface Resistivity of Solid Insulating Materials" and GB/T1408 "Test Method for Power Frequency Electrical Strength of Solid Insulating Materials". The inspection sampling rules shall be carried out in accordance with the provisions of GB/T2828 "Batch-by-Batch Inspection Counting Sampling Procedure and Sampling Table (Applicable to Inspection of Continuous Batch)".
This standard is proposed by the Food Papermaking Department of China Light Industry Association. This standard is under the jurisdiction of the National Papermaking Standardization Center. The drafting unit of this standard: Mudanjiang Steel Paper Enterprise Group Co., Ltd. The main drafters of this standard: Shi Fuqing and Sun Xiaojun. From the date of implementation of this standard, the former Light Industry Ministry Standard QB364--1981 "Hard Steel Paperboard" will be invalid. 391
1 Scope
Light Industry Industry Standard of the People's Republic of China
Steel Paperboard
This standard specifies the technical specifications of hard steel paperboard. QB/T 2199--1996
This standard applies to hard steel paperboard for parts and insulating materials of processing machinery, aviation, electrical instruments, railways, and textile equipment. 2 Reference Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T450—1989 Method for sampling of paper and paperboard GB/T451.2-1989 Method for determination of basis weight of paper and paperboard GB/T451.3—1989 Method for determination of thickness of paper and paperboard GB/T453—1989 Method for determination of tensile strength of paper and paperboard (constant rate loading method) GB/T 461.3-1989 Method for determination of absorbency of paper and paperboard (water immersion method) GB/T 462—1989 Method for determination of moisture content of paper and paperboard GB/T 463—1989 GB/T 1408—1989 GB/T 1410—1989 GB/T 2828—1987
Determination of ash content in paper and paperboard
Test method for power frequency electrical strength of solid insulating materialsTest method for volume resistivity and surface resistivity of solid insulating materialsBatch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches)GB/T10342—1989
GB/T 10739—1989
GB/T 12656—1990
3Product classification
Paper packaging and marking
Standard for sample handling and testing of pulp, paper and paperboardMethod for determination of power frequency breakdown voltage of atmospheric capacitor paper
3. 1 Hard steel paperboard can be divided into three types according to its use: A steel paperboard, B steel paperboard and C steel paperboard. Among them, C steel paperboard is divided into I and 1, 1 is intermittent production and 1 is continuous production. 3.1.1 Class A hard steel paperboard is used for aviation components. 3.1.2 Class B hard steel paperboard is used for parts of machinery, electrical appliances, and instruments, and for insulating and isolating materials. 3.1.3 Class C hard steel paperboard is used for textile, railway, oxygen equipment, and other mechanical parts, electrical appliances, and motors for insulating and isolating materials. 3.2 Hard steel paperboard is a flat paperboard.
3.3 The color of hard steel paperboard shall be in accordance with the order contract. 4 Technical requirements
The technical indicators of hard steel paperboard must comply with the provisions of Table 1 and Table 2. 4.1
Approved by China Light Industry General Association on March 22, 1996
Implemented on December 1, 1996
Indicator name
0. 5mm~0. 9mm
1. 0mm~2. 0mm
2.1mm~5.9mm
6.0mm and above
Volume resistivity at temperature (23±1)°C
QB/T 2199-1996
Not less than
Not less than
Breakdown voltage strength at 50Hz in air medium at temperature (23±1)°C and relative humidity (50±2)%
0.5mm~~0. 9mm
1.0mm~2.0mm
2. 1mm~~5. 0mm
5.1mm~~12mm
Cross-sectional tensile strength
0. 5mm~~0. 9mm
1.0mm～2.0mm
2. 1mm~3. 5mm
3. 6mm~5: 0mm
Above 5.0mm
Elongation
Interlayer peeling strength
1.5mm～~3.0mmNot less than
<1.5mm、>3.0mmNot tested
Water absorption
Water temperature (20±2)℃, soak for 24h
1. 0mm~ 2. 0mm
2. 1mm-~3. 5mm
3. 6mm~5. 0mm
Oil absorption rateImmersed for 24h
In aviation gasoline at (15~~20)℃
In transformer oil at (15~20)℃
Zinc chloride content
Not less than
Not less than
Not less than
Not greater than
Not tested
Not greater than
Not greater than
Not greater than
kV/rmm
Note: Hard steel paperboard above 5.0mm is made of thin steel paper. Class A
9×104
3.5.×104
6～10
Indicator name
Thickness, mm
0. 5～3.0
QB/T 2199--1996
Allowable error
Above 5.0
Allowable error
0. 5~~5. 0
Above 5.0
Allowable error
The size of hard steel paperboard is 1000mm×1200mm, 900mm×1200mm, 850mm×1000mm, 700mm×1200mm, 500mm×600mm, or as specified in the order contract, the size deviation shall not exceed ±10mm, and the deflection shall not exceed the following provisions:
8mm for 0.5mm～2.0mm; 10mm for 2.1mm～3.0mm; 12mm for 3.1mm～~15mm; 15mm for more than 15mm. 4.3 The surface of hard steel paperboard shall be smooth, flat and clean, without delamination, blistering, transparency, skin breakage and other paper defects, and the edge of the paperboard shall be cut straight. 4.4 After heating at 100℃~105℃ for 24h and soaking in water at 10℃~30℃ for 24h, there should be no cracking, blistering or delamination of the hard steel paperboard.
4.5 The hard steel paperboard should not crack or break when bent. 4.6 The hard steel paperboard should have good mechanical cold processing properties and should not cause delamination and peeling during processing. The steel paperboard to be processed should be treated at a relative humidity of (50±2)% and a temperature of (23±1)℃ for no less than 2 weeks to keep its moisture content within the range of (8±2)%. 4.7
The color tone of each batch of hard steel paperboard should be consistent.
The product number, thickness, size and color of the hard steel paperboard should be specified in the order contract. If there are special requirements, it can be produced according to the agreement. 5 Test method
The sample is taken in accordance with the provisions of GB/T450. 5.1 Thickness and tightness shall be measured in accordance with GB/T453.3 and GB/T453.2. 5.2 Volume resistivity
shall be measured in accordance with GB/T1410.
5.3 Breakdown voltage strength shall be measured in accordance with GB/T1408. 5.4 Tensile strength shall be measured in accordance with GB/T453, with the following supplements. 5.4.1 Size and shape of the specimen
5.4.1.The hard steel cardboard of 115mm and below is as shown in Figure 1. 90干0
5.4.1.2 The hard steel cardboard above 15mm should be processed into a cylindrical shape, as shown in Figure 2. 5.4.2 Test steps
QB/T 2199--1996
D(15±1.0)mm.d=(10±0.5)mm
For thickness above 20mm, D=(20±0.1)mm, d=（15±0.5)mm Figure 2
5.4.2.1 Measure the thickness of each part of the sample with an accuracy of 0.05mm and take the average value of the 5 points as the measurement result. 5.4.2.2 Place the prepared specimen between the two clamps of the universal material testing machine and clamp it firmly. Apply tension at a load rate of 125-150 kg/min until the specimen breaks. Record the reading of the applied tension and express the test result as the arithmetic mean of three measured values. 5.4.3 Calculation of the tensile force per unit cross section 5.4.3.1 Rigid steelboard with a thickness of 15 mm and below: Q=
Wherein: P--tensile force of the specimen, kN;
--cross-sectional area of the specimen before test, m\; F
---tensile strength per unit cross section, kN/m\Q,
5.4.3.2 Rigid steelboard with a thickness of more than 15 mm: P
Wherein: P-
-tensile force of the specimen, kN;
diameter of the specimen before test, m;
tensile strength per unit cross section, kN/m°. (1)
5.5 Determination of interlayer peel strength
5.5.1 From the edge of the hard steel paperboard not less than 50mm, cut three samples of 100mm in length and 30mm in width along the velvet direction of the paperboard, soak them in distilled water at (20±2)℃ for 24h, take them out, peel off the middle part of one end of the sample with the tip of a knife, and then tear it open by hand for about 30mm. Clamp the two torn ends on the upper and lower chucks of a 300N tensile testing machine, with a distance of 30mm between the two chucks, and then start the tensile testing machine to lower the lower clamp until the pointer stops moving. The arithmetic mean of the three measured values represents the measurement result. The interlayer peel strength (N/m) is calculated according to formula (3):
Where: F is the adhesive force, N,
D is the width of the sample, m.
5.6 Water absorption shall be determined in accordance with the provisions of GB/T461.3. 5.7 Determination of oil absorption rate
5.7.1 Determination of aviation gasoline absorption rate
Take three pieces of hard steel cardboard from different parts, with a size of 50mm×50mm, accurately weigh them, and soak them in aviation gasoline at 15-20℃ for 24h. Then take them out with a forge, wipe off the floating oil on the surface with filter paper, and quickly put them into a weighing bottle of known weight and weigh them to an accuracy of 0.01g. The result is calculated according to formula (4):
Where: S aviation gasoline absorption rate, %;
Gi——sample weight before oil absorption, g;
Gz——sample weight after oil absorption, g.
5.7.2 Determination of transformer oil absorption rate
QB/T 2199-1996
Take three pieces of hard steel cardboard from different parts, with a size of 50mm×50mm, weigh them accurately, and soak them in transformer oil at 15-20℃ for 24h, then take them out with a plater, wipe off the floating oil on the surface with filter paper, and quickly put them into a weighing bottle with known weight for weighing, accurate to 0.01g, and the result is calculated according to formula (5):
Where: S-
Transformer oil absorption rate, %;
Weight of sample before oil absorption,;
G.--Weight of sample after oil absorption, g.
5.8The moisture content shall be determined according to GB/T462. 5.9The ash content shall be determined according to GB/T463. s=G=G×100
（5）
5.10 Determination of zinc chloride content
First, cut the hard steel paperboard sample into small pieces of 2mm×2mm, weigh two portions of 2.5g, place one portion in an oven at 100-105℃ to dry to constant weight, and place the other portion in a 250mL conical flask. Then add about 150mL of distilled water and 2-4mL of 3% hydrogen peroxide solution. Boil on an electric stove for about 15min, pour the extract into a 250mL volumetric flask, and then inject 150mL of distilled water into the conical flask containing the sample (do not add hydrogen peroxide this time). After the second boiling, mix the extracts and place them in a 250mL volumetric flask, cool to 20℃, and dilute to the mark. Then transfer 50mL of the diluted solution into a 150mL conical flask, add 0.4mL of 5% potassium chromate indicator, and titrate with 0.01N silver nitrate until it turns orange. Calculate the result according to formula (6): Zinc chloride content (%) = c×V×0.068 2X5A
Wherein: V—
volume of 0.01N silver nitrate consumed, mL;
molar concentration of silver nitrate, mol/L;
A—constant weight of dried sample, g;
the mass of zinc chloride in grams equivalent to 1.00mL of standard silver nitrate titration solution [c(AgNO:）=1.00mol/L) 0.0682
6 Inspection rules
The supplier shall ensure that the product quality complies with the provisions of this standard, and the quantity delivered each time shall be regarded as a batch. Each piece shall be affixed with a certificate of conformity upon delivery, and the box shall contain 6.1
Product quality instructions.
6.2 Product delivery inspection sampling inspection shall be carried out in accordance with GB/T2828. 6.3 Sample collection and sample processing before inspection shall be carried out in accordance with GB/T450. 6.4 The items, sequence and inspection level, sampling plan and qualified quality level (AQL) of delivery sampling shall be carried out in accordance with Table 3. 396
Batch, sheet
Sampling plan
≤150
151~35000
QB/T 2199--1996
Normal inspection Secondary sampling plan Inspection level S-2 Class B nonconforming products
Sample size
Class C nonconforming products
AQL= 10
Classification of non-conformities
Class B non-conformities
Tensile strength
Breaking voltage strength
Class C non-conformities
Thickness, volume resistivity
Rate, elongation, interlayer
peel strength, water absorption
Rate, oil absorption, ash
content, moisture, zinc chloride
content, appearance
6.5 The purchaser has the right to inspect and accept according to this standard. If there is any objection to the product, the supplier should be notified within three months after arrival and re-inspected together. If it does not meet the requirements of this standard, it will be judged as a batch non-conformity and the supplier will be responsible for handling it. If it meets the requirements of this standard, it will be judged as a batch qualified and the purchaser will be responsible for handling it. 6.6 If the storage and transportation do not meet the requirements of this standard, resulting in quality not meeting the requirements of this standard, the relevant parties shall be responsible. 7 Marking, packaging, transportation, storage
The packaging and marking of the products shall be in accordance with the provisions of GB/T10342, with the following supplements. 7.1 The products shall be packed in this box. Under the premise of ensuring the quality of the products, with the consent of the user, wooden plywood packaging and soft packaging are allowed. 7.2 The weight of each piece of hard steel cardboard is 100kg, 150kg or as stipulated in the order contract. 7.3 The products shall be kept in a dry place, and the relative humidity shall be maintained at 60% to 70% and the temperature shall be maintained at 10 to 25℃. They shall be placed on a dry floor or wooden rack to prevent the influence of atmospheric condensation and ground moisture. 7.4 The products shall not be close to walls and heat transfer systems. 7.5 The products shall be transported by canopied and clean transportation vehicles. 3972 Hard steel paperboard with a thickness of more than 15 mm: P
Where: P-
-tensile strength of the sample, kN;
diameter of the sample before testing, m;
tensile strength per unit cross section, kN/m°. (1)
5.5 Determination of interlayer peeling strength
5.5.1 Starting from not less than 50 mm from the edge of the hard steel paperboard, cut 3 samples of 100 mm in length and 30 mm in width along the fleece direction of the paperboard, soak them in distilled water at (20±2)℃ for 24 h, take them out, peel off the middle part of one end of the sample with the tip of a knife, and then tear it open by hand for about 30 mm. Clamp the two torn ends on the upper and lower clamps of a 300N tensile testing machine, with a distance of 30 mm between the two clamps. Then start the tensile testing machine and lower the lower clamp hook until the pointer no longer moves. The arithmetic mean of three measured values is the measurement result. The interlayer peel strength (N/m) is calculated according to formula (3):
Wherein: F—adhesion, N,
D—sample width, m.
5.6 Water absorption is carried out according to the provisions of GB/T461.3. 5.7 Determination of oil absorption rate
5.7.1 Determination of aviation gasoline absorption rate
Take three pieces of hard steel cardboard from different parts, with a size of 50mm×50mm, accurately weigh them, and soak them in aviation gasoline at 15-20℃ for 24h. Then take them out with a forge, wipe off the floating oil on the surface with filter paper, and quickly put them into a weighing bottle of known weight and weigh them to an accuracy of 0.01g. The result is calculated according to formula (4):
Where: S aviation gasoline absorption rate, %;
Gi——sample weight before oil absorption, g;
Gz——sample weight after oil absorption, g.
5.7.2 Determination of transformer oil absorption rate
QB/T 2199-1996
Take three pieces of hard steel cardboard from different parts, with a size of 50mm×50mm, weigh them accurately, and soak them in transformer oil at 15-20℃ for 24h, then take them out with a plater, wipe off the floating oil on the surface with filter paper, and quickly put them into a weighing bottle with known weight for weighing, accurate to 0.01g, and the result is calculated according to formula (5):
Where: S-
Transformer oil absorption rate, %;
Weight of sample before oil absorption,;
G.--Weight of sample after oil absorption, g.
5.8The moisture content shall be determined according to GB/T462. 5.9The ash content shall be determined according to GB/T463. s=G=G×100
（5）
5.10 Determination of zinc chloride content
First, cut the hard steel paperboard sample into small pieces of 2mm×2mm, weigh two portions of 2.5g, place one portion in an oven at 100-105℃ to dry to constant weight, and place the other portion in a 250mL conical flask. Then add about 150mL of distilled water and 2-4mL of 3% hydrogen peroxide solution. Boil on an electric stove for about 15min, pour the extract into a 250mL volumetric flask, and then inject 150mL of distilled water into the conical flask containing the sample (do not add hydrogen peroxide this time). After the second boiling, mix the extracts and place them in a 250mL volumetric flask, cool to 20℃, and dilute to the mark. Then transfer 50mL of the diluted solution into a 150mL conical flask, add 0.4mL of 5% potassium chromate indicator, and titrate with 0.01N silver nitrate until it turns orange. Calculate the result according to formula (6): Zinc chloride content (%) = c×V×0.068 2X5A
Wherein: V—
volume of 0.01N silver nitrate consumed, mL;
molar concentration of silver nitrate, mol/L;
A—constant weight of dried sample, g;
the mass of zinc chloride in grams equivalent to 1.00mL of standard silver nitrate titration solution [c(AgNO:）=1.00mol/L) 0.0682
6 Inspection rules
The supplier shall ensure that the product quality complies with the provisions of this standard, and the quantity delivered each time shall be regarded as a batch. Each piece shall be affixed with a certificate of conformity upon delivery, and the box shall contain 6.1
Product quality instructions.
6.2 Product delivery inspection sampling inspection shall be carried out in accordance with GB/T2828. 6.3 Sample collection and sample processing before inspection shall be carried out in accordance with GB/T450. 6.4 The items, sequence and inspection level, sampling plan and qualified quality level (AQL) of delivery sampling shall be carried out in accordance with Table 3. 396
Batch, sheet
Sampling plan
≤150
151~35000
QB/T 2199--1996
Normal inspection Secondary sampling plan Inspection level S-2 Class B nonconforming products
Sample size
Class C nonconforming products
AQL= 10
Classification of non-conformities
Class B non-conformities
Tensile strength
Breaking voltage strength
Class C non-conformities
Thickness, volume resistivity
Rate, elongation, interlayer
peel strength, water absorption
Rate, oil absorption, ash
content, moisture, zinc chloride
content, appearance
6.5 The purchaser has the right to inspect and accept according to this standard. If there is any objection to the product, the supplier should be notified within three months after arrival and re-inspected together. If it does not meet the requirements of this standard, it will be judged as a batch non-conformity and the supplier will be responsible for handling it. If it meets the requirements of this standard, it will be judged as a batch qualified and the purchaser will be responsible for handling it. 6.6 If the storage and transportation do not meet the requirements of this standard, resulting in quality not meeting the requirements of this standard, the relevant parties shall be responsible. 7 Marking, packaging, transportation, storage
The packaging and marking of the products shall be in accordance with the provisions of GB/T10342, with the following supplements. 7.1 The products shall be packed in this box. Under the premise of ensuring the quality of the products, with the consent of the user, wooden plywood packaging and soft packaging are allowed. 7.2 The weight of each piece of hard steel cardboard is 100kg, 150kg or as stipulated in the order contract. 7.3 The products shall be kept in a dry place, and the relative humidity shall be maintained at 60% to 70% and the temperature shall be maintained at 10 to 25℃. They shall be placed on a dry floor or wooden rack to prevent the influence of atmospheric condensation and ground moisture. 7.4 The products shall not be close to walls and heat transfer systems. 7.5 The products shall be transported by canopied and clean transportation vehicles. 3972 Hard steel paperboard with a thickness of more than 15 mm: P
Where: P-
-tensile strength of the sample, kN;
diameter of the sample before testing, m;
tensile strength per unit cross section, kN/m°. (1)
5.5 Determination of interlayer peeling strength
5.5.1 Starting from not less than 50 mm from the edge of the hard steel paperboard, cut 3 samples of 100 mm in length and 30 mm in width along the fleece direction of the paperboard, soak them in distilled water at (20±2)℃ for 24 h, take them out, peel off the middle part of one end of the sample with the tip of a knife, and then tear it open by hand for about 30 mm. Clamp the two torn ends on the upper and lower clamps of a 300N tensile testing machine, with a distance of 30 mm between the two clamps. Then start the tensile testing machine and lower the lower clamp hook until the pointer no longer moves. The arithmetic mean of three measured values is the measurement result. The interlayer peel strength (N/m) is calculated according to formula (3):
Wherein: F—adhesion, N,
D—sample width, m.
5.6 Water absorption is carried out according to the provisions of GB/T461.3. 5.7 Determination of oil absorption rate
5.7.1 Determination of aviation gasoline absorption rate
Take three pieces of hard steel cardboard from different parts, with a size of 50mm×50mm, accurately weigh them, and soak them in aviation gasoline at 15-20℃ for 24h. Then take them out with a forge, wipe off the floating oil on the surface with filter paper, and quickly put them into a weighing bottle of known weight and weigh them to an accuracy of 0.01g. The result is calculated according to formula (4):
Where: S aviation gasoline absorption rate, %;
Gi——sample weight before oil absorption, g;
Gz——sample weight after oil absorption, g.
5.7.2 Determination of transformer oil absorption rate
QB/T 2199-1996
Take three pieces of hard steel cardboard from different parts, with a size of 50mm×50mm, weigh them accurately, and soak them in transformer oil at 15-20℃ for 24h, then take them out with a plater, wipe off the floating oil on the surface with filter paper, and quickly put them into a weighing bottle with known weight for weighing, accurate to 0.01g, and the result is calculated according to formula (5):
Where: S-
Transformer oil absorption rate, %;
Weight of sample before oil absorption,;
G.--Weight of sample after oil absorption, g.
5.8The moisture content shall be determined according to GB/T462. 5.9The ash content shall be determined according to GB/T463. s=G=G×100
（5）
5.10 Determination of zinc chloride content
First, cut the hard steel paperboard sample into small pieces of 2mm×2mm, weigh two portions of 2.5g, place one portion in an oven at 100-105℃ to dry to constant weight, and place the other portion in a 250mL conical flask. Then add about 150mL of distilled water and 2-4mL of 3% hydrogen peroxide solution. Boil on an electric stove for about 15min, pour the extract into a 250mL volumetric flask, and then inject 150mL of distilled water into the conical flask containing the sample (do not add hydrogen peroxide this time). After the second boiling, mix the extracts and place them in a 250mL volumetric flask, cool to 20℃, and dilute to the mark. Then transfer 50mL of the diluted solution into a 150mL conical flask, add 0.4mL of 5% potassium chromate indicator, and titrate with 0.01N silver nitrate until it turns orange. Calculate the result according to formula (6): Zinc chloride content (%) = c×V×0.068 2X5A
Wherein: V—
volume of 0.01N silver nitrate consumed, mL;
molar concentration of silver nitrate, mol/L;
A—constant weight of dried sample, g;
the mass of zinc chloride in grams equivalent to 1.00mL of standard silver nitrate titration solution [c(AgNO:）=1.00mol/L) 0.0682
6 Inspection rules
The supplier shall ensure that the product quality complies with the provisions of this standard, and the quantity delivered each time shall be regarded as a batch. Each piece shall be affixed with a certificate of conformity upon delivery, and the box shall contain 6.1
Product quality instructions.
6.2 Product delivery inspection sampling inspection shall be carried out in accordance with GB/T2828. 6.3 Sample collection and sample processing before inspection shall be carried out in accordance with GB/T450. 6.4 The items, sequence and inspection level, sampling plan and qualified quality level (AQL) of delivery sampling shall be carried out in accordance with Table 3. 396
Batch, sheet
Sampling plan
≤150
151~35000
QB/T 2199--1996
Normal inspection Secondary sampling plan Inspection level S-2 Class B nonconforming products
Sample size
Class C nonconforming products
AQL= 10
Classification of non-conformities
Class B non-conformities
Tensile strength
Breaking voltage strength
Class C non-conformities
Thickness, volume resistivity
Rate, elongation, interlayer
peel strength, water absorption
Rate, oil absorption, ash
content, moisture, zinc chloride
content, appearance
6.5 The purchaser has the right to inspect and accept according to this standard. If there is any objection to the product, the supplier should be notified within three months after arrival and re-inspected together. If it does not meet the requirements of this standard, it will be judged as a batch non-conformity and the supplier will be responsible for handling it. If it meets the requirements of this standard, it will be judged as a batch qualified and the purchaser will be responsible for handling it. 6.6 If the storage and transportation do not meet the requirements of this standard, resulting in quality not meeting the requirements of this standard, the relevant parties shall be responsible. 7 Marking, packaging, transportation, storage
The packaging and marking of the products shall be in accordance with the provisions of GB/T10342, with the following supplements. 7.1 The products shall be packed in this box. Under the premise of ensuring the quality of the products, with the consent of the user, wooden plywood packaging and soft packaging are allowed. 7.2 The weight of each piece of hard steel cardboard is 100kg, 150kg or as stipulated in the order contract. 7.3 The products shall be kept in a dry place, and the relative humidity shall be maintained at 60% to 70% and the temperature shall be maintained at 10 to 25℃. They shall be placed on a dry floor or wooden rack to prevent the influence of atmospheric condensation and ground moisture. 7.4 The products shall not be close to walls and heat transfer systems. 7.5 The products shall be transported by canopied and clean transportation vehicles. 39710 Determination of zinc chloride content
First, cut the hard steel paperboard sample into small pieces of 2mm×2mm, weigh two portions of 2.5g, place one portion in an oven at 100-105℃ to dry to constant weight, and place the other portion in a 250mL conical flask, then add about 150mL of distilled water, and then add 2-4mL of 3% hydrogen peroxide solution, boil on an electric stove for about 15min, pour the extract into a 250mL volumetric flask, and then inject 150mL of distilled water into the conical flask containing the sample (do not add hydrogen peroxide this time), after the second boiling, mix the extracts and put them in a 250mL volumetric flask, cool to 20℃, and dilute to the mark. Then transfer 50mL of the diluted solution into a 150mL conical flask, add 0.4mL of 5% potassium chromate indicator, and titrate with 0.01N silver nitrate until it turns orange. Calculate the result according to formula (6): Zinc chloride content (%) = c×V×0.068 2X5A
Wherein: V—
volume of 0.01N silver nitrate consumed, mL;
molar concentration of silver nitrate, mol/L;
A—constant weight of dried sample, g;
the mass of zinc chloride in grams equivalent to 1.00mL of standard silver nitrate titration solution [c(AgNO:）=1.00mol/L) 0.0682
6 Inspection rules
The supplier shall ensure that the product quality complies with the provisions of this standard, and the quantity delivered each time shall be regarded as a batch. Each piece shall be affixed with a certificate of conformity upon delivery, and the box shall contain 6.1
Product quality instructions.
6.2 Product delivery inspection sampling inspection shall be carried out in accordance with GB/T2828. 6.3 Sample collection and sample processing before inspection shall be carried out in accordance with GB/T450. 6.4 The items, sequence and inspection level, sampling plan and qualified quality level (AQL) of delivery sampling shall be carried out in accordance with Table 3. 396
Batch, sheet
Sampling plan
≤150
151~35000
QB/T 2199--1996
Normal inspection Secondary sampling plan Inspection level S-2 Class B nonconforming products
Sample size
Class C nonconforming products
AQL= 10
Classification of non-conformities
Class B non-conformities
Tensile strength
Breaking voltage strength
Class C non-conformities
Thickness, volume resistivity
Rate, elongation, interlayer
peel strength, water absorption
Rate, oil absorption, ash
content, moisture, zinc chloride
content, appearance
6.5 The purchaser has the right to inspect and accept according to this standard. If there is any objection to the product, the supplier should be notified within three months after arrival and re-inspected together. If it does not meet the requirements of this standard, it will be judged as a batch non-conformity and the supplier will be responsible for handling it. If it meets the requirements of this standard, it will be judged as a batch qualified and the purchaser will be responsible for handling it. 6.6 If the storage and transportation do not meet the requirements of this standard, resulting in quality not meeting the requirements of this standard, the relevant parties shall be responsible. 7 Marking, packaging, transportation, storage
The packaging and marking of the products shall be in accordance with the provisions of GB/T10342, with the following supplements. 7.1 The products shall be packed in this box. Under the premise of ensuring the quality of the products, with the consent of the user, wooden plywood packaging and soft packaging are allowed. 7.2 The weight of each piece of hard steel cardboard is 100kg, 150kg or as stipulated in the order contract. 7.3 The products shall be kept in a dry place, and the relative humidity shall be maintained at 60% to 70% and the temperature shall be maintained at 10 to 25℃. They shall be placed on a dry floor or wooden rack to prevent the influence of atmospheric condensation and ground moisture. 7.4 The products shall not be close to walls and heat transfer systems. 7.5 The products shall be transported by canopied and clean transportation vehicles. 39710 Determination of zinc chloride content
First, cut the hard steel paperboard sample into small pieces of 2mm×2mm, weigh two portions of 2.5g, place one portion in an oven at 100-105℃ to dry to constant weight, and place the other portion in a 250mL conical flask, then add about 150mL of distilled water, and then add 2-4mL of 3% hydrogen peroxide solution, boil on an electric stove for about 15min, pour the extract into a 250mL volumetric flask, and then inject 150mL of distilled water into the conical flask containing the sample (do not add hydrogen peroxide this time), after the second boiling, mix the extracts and put them in a 250mL volumetric flask, cool to 20℃, and dilute to the mark. Then transfer 50mL of the diluted solution into a 150mL conical flask, add 0.4mL of 5% potassium chromate indicator, and titrate with 0.01N silver nitrate until it turns orange. Calculate the result according to formula (6): Zinc chloride content (%) = c×V×0.068 2X5A
Wherein: V—
volume of 0.01N silver nitrate consumed, mL;bzxZ.net
molar concentration of silver nitrate, mol/L;
A—constant weight of dried sample, g;
the mass of zinc chloride in grams equivalent to 1.00mL of standard silver nitrate titration solution [c(AgNO:）=1.00mol/L) 0.0682
6 Inspection rules
The supplier shall ensure that the product quality complies with the provisions of this standard, and the quantity delivered each time shall be regarded as a batch. Each piece shall be affixed with a certificate of conformity upon delivery, and the box shall contain 6.1
Product quality instructions.
6.2 Product delivery inspection sampling inspection shall be carried out in accordance with GB/T2828. 6.3 Sample collection and sample processing before inspection shall be carried out in accordance with GB/T450. 6.4 The items, sequence and inspection level, sampling plan and qualified quality level (AQL) of delivery sampling shall be carried out in accordance with Table 3. 396
Batch, sheet
Sampling plan
≤150
151~35000
QB/T 2199--1996
Normal inspection Secondary sampling plan Inspection level S-2 Class B nonconforming products
Sample size
Class C nonconforming products
AQL= 10
Classification of non-conformities
Class B non-conformities
Tensile strength
Breaking voltage strength
Class C non-conformities
Thickness, volume resistivity
Rate, elongation, interlayer
peel strength, water absorption
Rate, oil absorption, ash
content, moisture, zinc chloride
content, appearance
6.5 The purchaser has the right to inspect and accept according to this standard. If there is any objection to the product, the supplier should be notified within three months after arrival and re-inspected together. If it does not meet the requirements of this standard, it will be judged as a batch non-conformity and the supplier will be responsible for handling it. If it meets the requirements of this standard, it will be judged as a batch qualified and the purchaser will be responsible for handling it. 6.6 If the storage and transportation do not meet the requirements of this standard, resulting in quality not meeting the requirements of this standard, the relevant parties shall be responsible. 7 Marking, packaging, transportation, storage
The packaging and marking of the products shall be in accordance with the provisions of GB/T10342, with the following supplements. 7.1 The products shall be packed in this box. Under the premise of ensuring the quality of the products, with the consent of the user, wooden plywood packaging and soft packaging are allowed. 7.2 The weight of each piece of hard steel cardboard is 100kg, 150kg or as stipulated in the order contract. 7.3 The products shall be kept in a dry place, and the relative humidity shall be maintained at 60% to 70% and the temperature shall be maintained at 10 to 25℃. They shall be placed on a dry floor or wooden rack to prevent the influence of atmospheric condensation and ground moisture. 7.4 The products shall not be close to walls and heat transfer systems. 7.5 The products shall be transported by canopied and clean transportation vehicles. 397
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