HG/T 2904-1997 Poly(perfluoroethylene propylene) resin for molding and extrusion
Some standard content:
HG/T29041997
This standard is equivalent to the I, straight and IV type resins of ASTMD2116:1991 (a) "FEP fluorocarbon resins for molding and extrusion". Compared with ASTMD2116, the three indicators of appearance, volatile matter and thermal stress cracking resistance are added to the fluoroethylene propylene resins for molding and extrusion listed in this standard. The index values of tensile strength, elongation at break and melting point of superior products are better than those of the corresponding resins in ASTM D 2116.
The previous version of this standard is GB9351-88 "Fluorinated ethylene propylene resins for molding and extrusion". Differences from the previous version: the degree of standard adoption is changed from reference adoption to equivalent adoption; due to the low accuracy of instruments and equipment, there is a lag between the temperature of the template and the mold, so the sample preparation temperature is changed from \325℃±5℃" in the original standard to \325℃±10℃" in this standard, and the content of "cooling under pressure" is added. At the same time, the mold materials and the quantity of each batch in the original standard have been appropriately modified. From the date of implementation of this standard, the original national standard GB9351-88 "Fluorinated ethylene propylene resin for molding and extrusion" shall be abolished. This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Plastic Resin Product Sub-Technical Committee of the National Plastic Standardization Technical Committee (TC15/SC4). The responsible drafting unit of this standard: Shanghai San Ai Fu New Materials Co., Ltd. The main drafters of this standard: Ma Yujin, Wu Yulin, Xu Fang, Xie Ming. 935
Chemical Industry Standard of the People's Republic of China
Fluorinated ethylene propylene resin for molding and extrusion PFEP-Fluorocarbon moulding and extrusion materials HG/T2904—1997
Replaces GB 9351-88
This standard specifies the model, requirements, test methods, inspection rules, marking, packaging, storage and transportation of fluoroethylene propylene resin for molding and extrusion.
This standard applies to polyperfluoroethylene propylene resin for molding and extrusion after pelletization. 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. GB1033-86Test method for density and relative density of plastics (neqISO/DIS1183:1984) GB/T1039-92General principles for test methods for mechanical properties of plastics GB/T1040-92Test method for tensile properties of plastics (neqISO/R527:1966) GB1409-88Test method for relative dielectric constant and dielectric loss factor of solid insulating materials at power frequency, audio frequency and high frequency (including meter wavelength)
Test method for environmental stress cracking of polyethylene
GB 184282
GB/T1844.1-1995Abbreviation code for plastics and resins Part 1 Basic compounds and their characteristic properties (neqISO1043.1:1988)
GB 2918--82(88)
GB 3682-83(88)
Standard environment for conditioning and testing of plastic specimens (eqvISO 291:1977)Test method for melt flow rate of thermoplastics (neqISO1130:1981)GB6678-86General rules for sampling of chemical products
3 Model
3.1 According to the provisions of GB/T1844.1, the abbreviation code of perfluoroethylene propylene resin is PFEP. 3.2 This product is divided into three models: E1, E2 and M3 according to the molding method and melt flow rate, see Table 1. Table 1 Product molding method and melt flow rate code Molding method
Ministry of Chemical Industry of the People's Republic of China approved on May 23, 1997 936
Melt flow rate, g/10min
2.1～4. 0
Implementation on October 1, 1997
HG/T 2904—1997
3.3 The main uses of each type of product are shown in Table 2. Table 2 Uses of each type of product
4 Requirements
General extrusion plastic: mainly used for wire insulation, pipes, plates, films and various parts Heat stress cracking resistant extrusion plastic: mainly used for wire insulation, thin-walled pipes Heat stress cracking resistant molding plastic: mainly used for heat shrinkable tubes, linings, wire insulation The technical requirements of this product shall comply with the provisions of Table 3. Table 3 Technical requirements
Melt flow rate", g/10min
Tensile strength\, MPa
Elongation at break\, %
Relative density
Melting point", ℃
Dielectric constant, 10°Hz
Dielectric loss tangent, 10°Hz
Volatile matter, %
Resistance to thermal stress cracking
Note: *The results are obtained by rounding value comparison method
Test method
5.1 Sampling
Superior quality and first-class quality are qualified Superior quality, first-class quality, qualified quality, superior quality, M3
First-class quality, qualified quality
Translucent particles, which shall not contain impurities such as metal chips and sand particles, and the percentage of particles containing visible black spots shall not exceed
265±10
265±15
2.12~2.17
265±10
265±15
7.0×10-4
265±10
265±15
Sampling shall be carried out in accordance with GB6678. The number of sampling units shall be in accordance with the provisions of Table 2 of GB6678--86, and the sampling unit shall be calculated in packaging barrels. Take an equal amount of the required sample from each packaging barrel, mix it evenly, and put it into a clean and dry container. The sample should be kept clean and dry to prevent the introduction of impurities such as moisture and dust. Sampling is allowed during the production line or barrel sealing process, and uniform and representative samples are taken. The manufacturer name, product name, model, batch number and sampling date shall be marked on the sampling container. 5.2 Preparation of test pieces
5.2.1 Mold
Instructions for use:
1) In ASTMD2116-91&, tensile strength (MPa) Type I (corresponding to E1) ≥17.3; Type IV (equivalent to E2) ≥18.7, Type I (corresponding to M3) ≥20.7. 2) In ASTMD2116-91a, elongation at break (%), Type I (corresponding to E1) ≥275, Type N (equivalent to E2) ≥275, Type I (corresponding to M3) ≥300. 3) In ASTMD2116-91a, melting point (℃), 265±15. 937
HG/T 2904---1997
Use the plate-frame mold shown in Figure 1, and its technical conditions are as follows: a) Material: heat-resistant mold steel;
Figure 1 Schematic diagram of plate-frame mold
b) Template size: 170mm×170mm×2mm; c) Frame outer size: 170mm×170mm; d) Frame inner size: 120mm×120mm; e) Frame thickness: 1.5mm2.0mm.3.0mm. 5.2.2 Operation steps
a) Weigh 51g±1g of fluorinated ethylene propylene resin and put it into a mold with a frame thickness of 1.5mm. b) Lay a layer of annealed aluminum foil with a thickness of about 0.07mm between the template and the fluorinated ethylene propylene resin, and place the mold on the lower plate of the hydraulic press heated to 325℃±10℃. Lower the upper plate of the hydraulic press until it contacts the mold, and keep it for 2min~4min without applying pressure. Apply a pressure of 1MPa and keep it for 1min~1.5min. Then, apply a pressure of 2MPa~4MPa and keep it for 1min~1.5min. The temperature of the hydraulic press plate is always kept at 325℃±10℃. Take out the mold and put it on the cold press plate, close the upper and lower plates, and apply a pressure of 2MPa~4MPa. This pressure must be maintained before cooling to 200℃. When the mold cools to 50℃~60℃, take out the test piece from the mold and peel off the aluminum box. c) The test piece with a thickness of 1.5mm±0.2mm is used to measure tensile strength, elongation at break and relative density. d) Weigh 68g±1g of perfluoroethylene-propylene resin and put it into a mold with a mold frame thickness of 2.Omm. Repeat the operation steps of b) to make a test piece with a thickness of 2.0mm±0.2mm for measuring electrical properties. e) Weigh 102g ± 1g of polyperfluoroethylene propylene resin, put it into a mold with a mold frame thickness of 3.0mm, repeat the operation steps in b) to make a test piece with a thickness of 3.0mm ± 0.2mm for measuring heat stress cracking resistance. 5.3 Appearance inspection
Take about 500 resin pellets and inspect the number of particles with visible black spots under natural light. Calculate the percentage according to formula (1). N
Wherein: N--the percentage of particles with visible black spots, %, n--the number of particles with visible black spots.
5.4 Determination of melt flow rate
Carry out in accordance with the provisions of GB/T3682. Wherein: a) Temperature: 372℃±1℃;
b) Load: 5kg;
c) Inner diameter of die: 2.095mm±0.005mmd) Cutting time interval and number of sampling strips are shown in Table 4. X100.
Table 4 Cutting conditions
Melt flow rate, g/10min
4. 1~~12. 0
5.5 Determination of tensile strength and elongation at break 5.5.1 Test specimen
Time interval, 8
Number of cut specimens
（1）)
HG/T 2904--1997
The specimen is punched out from the test piece prepared in 5.2.2.3. Its dimensions are shown in Figure 2: R5±0.8
5.5.2 Conditioning
Figure 2 Dimensions of tensile specimen
Condition according to the standard environment specified in GB/T2918. The conditioning time shall be at least 4h. 5.5.3 Operating steps
Perform according to the provisions of GB/T1039 and GB/T1040. Where: a) The test environment temperature is 23℃±2℃; b) The tensile speed is 50mm/min±5mm/minc) The lengths of the two ends of the sample held by the clamps are equal, and the distance between the clamps is 24mm; d) The elongation at break is calculated according to formula (2):
Where: E
Elongation at break, %;
Initial length of the sample, mm;
L Length of the sample at break, mm.
(2)
e) The test results are expressed as the arithmetic mean of each group of samples. The relative deviation of each test value shall not exceed ±10%. If it exceeds ±10%, the value shall be discarded. After discarding, the number of samples shall not be less than 3. 5.6 Determination of relative density
is carried out according to the provisions of Method A in GB1033-86. The sample is punched out from the test piece prepared in 5.2.2.3, and its size is 38mm×25mm.
5.7 Determination of melting point
5.7.1 Instrument
Differential scanning calorimeter (DSC).
5.7.2 Operating steps
Accurately weigh 20 mg ± 0.5 mg of sample, heat at a heating rate of 10°C/min in a nitrogen atmosphere until the polyperfluoroethylene propylene resin is completely melted, and take the peak temperature of the molten bee as the melting point of the polymer. The test results are expressed in integers. 5.8 The determination of dielectric constant and dielectric loss tangent is carried out in accordance with the provisions of GB1409, the measurement frequency is 106 Hz, and the sample is punched from the test piece prepared in 5.2.2.4. 5.9 Determination of volatile matter
Volatile matter refers to the mass loss of the sample after it is kept at a specified temperature and vacuum for a certain period of time. 5.9.1 Apparatus and equipment
a) Heating device: as shown in Figure 3;
b) Vacuum pump: ultimate vacuum 6.6×10-2Pa; c) Balance: sensitivity 0.1g;
d) Dryer.
Thermocouple hole
Heating wire
Wire inlet
5.9.2 Procedure
HG/T 2904bzxz.net
Figure 3 Schematic diagram of volatile matter device
a) Make a round tube with aluminum foil and weigh it accurately to 0.0001g. b) Add 3g~5g of polyperfluoroethylene propylene resin into the aluminum tube (accurately weighed to 0.0001g); Vacuum port
Glass cover
Sampling hole
Heating core seat
Asbestos board
c) Put the aluminum tube containing the sample into the sampling hole of the heating device, control the temperature to 380℃±1℃, and keep it for 30min under a vacuum degree of less than 1.5kPa.
d) Take out the aluminum tube and put it into a desiccator to cool to room temperature, and weigh it accurately to 0.0001g. 5.9.3 Result Expression
The volatile matter is calculated according to formula (3):
Wherein: V-
volatile matter, %,
-mass of empty tube before heating, 8,
m2-mass of empty tube and resin before heating, g
-mass of empty tube and resin after heating, g.
_mz-ms×100
The test result is expressed as the arithmetic mean of two specimens, with two decimal places. 5.10 Determination of Thermal Stress Cracking Resistance
The thermal stress cracking resistance refers to the cracking resistance of the bending specimen with notches on the surface under the specified temperature and time conditions. 5.10.1 Specimen
The specimen is punched out from the test piece prepared in 5.2.2.5. Its length is 38mm±2mm and its width is 13mm±1mm. 5.10.2 Operation steps
Perform according to the provisions of GB1842. Among them:
a) Test temperature: 250℃±1℃;
b) Test time: 6h;
c) Test medium: air.
5.10.3 Result expression
HG/T 2904---- 1997
If there are visible new cracks on the surface of the sample, it is unqualified. 6 Inspection rules
6.1 Inspection is carried out in batches, and the maximum amount of production is a batch of polymerization kettles or mixing. 6.2 Each batch of products must be inspected by the quality inspection department of the manufacturer, and it is guaranteed that all products leaving the factory meet the requirements of this standard. Each batch of products should have a quality inspection report.
6.3 Inspection is divided into factory inspection and type inspection. Among the technical indicators in Table 3, (1) appearance, (2) melt flow rate, (3) tensile strength, and (4) elongation at break are mandatory items for each batch, and the rest are random inspection items, among which (6) melting point and (9) volatile matter are randomly inspected at least once every 25 batches; (5) relative density, (7) dielectric constant, and (8) dielectric loss tangent are randomly inspected at least once every 50 batches; (10) thermal stress cracking resistance is inspected according to the requirements of the purchaser. Type inspection is carried out in accordance with the provisions of 6.6.1 of GB/T1.3. 6.4 The user has the right to accept the received products in accordance with the provisions of this standard, and the acceptance inspection shall be carried out within one month of receiving the products.
6.5 Inspection results If any indicator does not meet the requirements of this standard, double samples should be randomly taken from the batch of products to re-inspect the unqualified items. If the re-inspection results still do not meet the requirements of this standard, the batch of products shall be unqualified. 6.6 When the supply and demand parties have any objections to the product quality, the two parties may negotiate to resolve the dispute or the statutory quality inspection department may conduct arbitration. 7 Marking, packaging, storage and transportation
7.1 Marking
The packaging barrel of this product should have a firm and clear label indicating the manufacturer's name, product name, product model, grade, net content, batch number or production date and this standard number.
7.2 Packaging
This product should be packaged in two layers of polyethylene plastic bags and then packed in hard barrels. The net content of each barrel shall not exceed 30kg. Each packaging barrel shall have a product certificate.
7.3 Storage and transportation
This product is transported as non-dangerous goods and should be protected from moisture and severe vibration during transportation. This product should be stored in a clean, cool and dry place to prevent rain, sunlight, moisture, dust and other impurities. 9413 Operation steps
Perform according to the provisions of GB/T1039 and GB/T1040. Wherein: a) The test environment temperature is 23℃±2℃; b) The tensile speed is 50mm/min±5mm/minc) The lengths of the two ends of the sample held by the clamps are equal, and the distance between the clamps is 24mm; d) The elongation at break is calculated according to formula (2):
Wherein: E
Elongation at break, %;
Initial length of the sample, mm;
L Length of the sample at break, mm.
(2)
e) The test results are expressed as the arithmetic mean of each group of samples. The relative deviation of each test value shall not exceed ±10%. If it exceeds ±10%, the value shall be discarded. After discarding, the number of samples shall not be less than 3. 5.6 Determination of relative density
Perform according to the provisions of Method A in GB1033-86. The sample is punched out from the test piece prepared in 5.2.2.3, and its size is 38mm×25mm.
5.7 Determination of melting point
5.7.1 Instrument
Differential scanning calorimeter (DSC).
5.7.2 Operation steps
Accurately weigh 20mg±0.5mg of the sample, and heat it at a heating rate of 10℃/min in a nitrogen atmosphere until the polyperfluoroethylene propylene resin is completely melted. The peak temperature of the molten bee is taken as the melting point of the polymer. The test results are expressed in integers. 5.8 The determination of dielectric constant and dielectric loss tangent is carried out in accordance with the provisions of GB1409, and the measurement frequency is 106Hz. The sample is punched out from the test piece prepared in 5.2.2.4. 5.9 Determination of volatile matter
Volatile matter refers to the mass loss of the sample after it is kept at a specified temperature and vacuum for a certain period of time. 5.9.1 Apparatus and equipment
a) Heating device: as shown in Figure 3;
b) Vacuum pump: ultimate vacuum 6.6×10-2Pa; c) Balance: sensitivity 0.1g;
d) Dryer.
Thermocouple hole
Heating wire
Wire inlet
5.9.2 Procedure
HG/T 2904
Figure 3 Schematic diagram of volatile matter device
a) Make a round tube with aluminum foil and weigh it accurately to 0.0001g. b) Add 3g~5g of polyperfluoroethylene propylene resin into the aluminum tube (accurately weighed to 0.0001g); Vacuum port
Glass cover
Sampling hole
Heating core seat
Asbestos board
c) Put the aluminum tube containing the sample into the sampling hole of the heating device, control the temperature to 380℃±1℃, and keep it for 30min under a vacuum degree of less than 1.5kPa.
d) Take out the aluminum tube and put it into a desiccator to cool to room temperature, and weigh it accurately to 0.0001g. 5.9.3 Result Expression
The volatile matter is calculated according to formula (3):
Wherein: V-
volatile matter, %,
-mass of empty tube before heating, 8,
m2-mass of empty tube and resin before heating, g
-mass of empty tube and resin after heating, g.
_mz-ms×100
The test result is expressed as the arithmetic mean of two specimens, with two decimal places. 5.10 Determination of Thermal Stress Cracking Resistance
The thermal stress cracking resistance refers to the cracking resistance of the bending specimen with notches on the surface under the specified temperature and time conditions. 5.10.1 Specimen
The specimen is punched out from the test piece prepared in 5.2.2.5. Its length is 38mm±2mm and its width is 13mm±1mm. 5.10.2 Operation steps
Perform according to the provisions of GB1842. Among them:
a) Test temperature: 250℃±1℃;
b) Test time: 6h;
c) Test medium: air.
5.10.3 Result expression
HG/T 2904---- 1997
If there are visible new cracks on the surface of the sample, it is unqualified. 6 Inspection rules
6.1 Inspection is carried out in batches, and the maximum amount of production is a batch of polymerization kettles or mixing. 6.2 Each batch of products must be inspected by the quality inspection department of the manufacturer, and it is guaranteed that all products leaving the factory meet the requirements of this standard. Each batch of products should have a quality inspection report.
6.3 Inspection is divided into factory inspection and type inspection. Among the technical indicators in Table 3, (1) appearance, (2) melt flow rate, (3) tensile strength, and (4) elongation at break are mandatory items for each batch, and the rest are random inspection items, among which (6) melting point and (9) volatile matter are randomly inspected at least once every 25 batches; (5) relative density, (7) dielectric constant, and (8) dielectric loss tangent are randomly inspected at least once every 50 batches; (10) thermal stress cracking resistance is inspected according to the requirements of the purchaser. Type inspection is carried out in accordance with the provisions of 6.6.1 of GB/T1.3. 6.4 The user has the right to accept the received products in accordance with the provisions of this standard, and the acceptance inspection shall be carried out within one month of receiving the products.
6.5 Inspection results If any indicator does not meet the requirements of this standard, double samples should be randomly taken from the batch of products to re-inspect the unqualified items. If the re-inspection results still do not meet the requirements of this standard, the batch of products shall be unqualified. 6.6 When the supply and demand parties have any objections to the product quality, the two parties may negotiate to resolve the dispute or the statutory quality inspection department may conduct arbitration. 7 Marking, packaging, storage and transportation
7.1 Marking
The packaging barrel of this product should have a firm and clear label indicating the manufacturer's name, product name, product model, grade, net content, batch number or production date and this standard number.
7.2 Packaging
This product should be packaged in two layers of polyethylene plastic bags and then packed in hard barrels. The net content of each barrel shall not exceed 30kg. Each packaging barrel shall have a product certificate.
7.3 Storage and transportation
This product is transported as non-dangerous goods and should be protected from moisture and severe vibration during transportation. This product should be stored in a clean, cool and dry place to prevent rain, sunlight, moisture, dust and other impurities. 9413 Operation steps
Perform according to the provisions of GB/T1039 and GB/T1040. Wherein: a) The test environment temperature is 23℃±2℃; b) The tensile speed is 50mm/min±5mm/minc) The lengths of the two ends of the sample held by the clamps are equal, and the distance between the clamps is 24mm; d) The elongation at break is calculated according to formula (2):
Wherein: E
Elongation at break, %;
Initial length of the sample, mm;
L Length of the sample at break, mm.
(2)
e) The test results are expressed as the arithmetic mean of each group of samples. The relative deviation of each test value shall not exceed ±10%. If it exceeds ±10%, the value shall be discarded. After discarding, the number of samples shall not be less than 3. 5.6 Determination of relative density
Perform according to the provisions of Method A in GB1033-86. The sample is punched out from the test piece prepared in 5.2.2.3, and its size is 38mm×25mm.
5.7 Determination of melting point
5.7.1 Instrument
Differential scanning calorimeter (DSC).
5.7.2 Operation steps
Accurately weigh 20mg±0.5mg of the sample, and heat it at a heating rate of 10℃/min in a nitrogen atmosphere until the polyperfluoroethylene propylene resin is completely melted. The peak temperature of the molten bee is taken as the melting point of the polymer. The test results are expressed in integers. 5.8 The determination of dielectric constant and dielectric loss tangent is carried out in accordance with the provisions of GB1409, and the measurement frequency is 106Hz. The sample is punched out from the test piece prepared in 5.2.2.4. 5.9 Determination of volatile matter
Volatile matter refers to the mass loss of the sample after it is kept at a specified temperature and vacuum for a certain period of time. 5.9.1 Apparatus and equipment
a) Heating device: as shown in Figure 3;
b) Vacuum pump: ultimate vacuum 6.6×10-2Pa; c) Balance: sensitivity 0.1g;
d) Dryer.
Thermocouple hole
Heating wire
Wire inlet
5.9.2 Procedure
HG/T 2904
Figure 3 Schematic diagram of volatile matter device
a) Make a round tube with aluminum foil and weigh it accurately to 0.0001g. b) Add 3g~5g of polyperfluoroethylene propylene resin into the aluminum tube (accurately weighed to 0.0001g); Vacuum port
Glass cover
Sampling hole
Heating core seat
Asbestos board
c) Put the aluminum tube containing the sample into the sampling hole of the heating device, control the temperature to 380℃±1℃, and keep it for 30min under a vacuum degree of less than 1.5kPa.
d) Take out the aluminum tube and put it into a desiccator to cool to room temperature, and weigh it accurately to 0.0001g. 5.9.3 Result Expression
The volatile matter is calculated according to formula (3):
Wherein: V-
volatile matter, %,
-mass of empty tube before heating, 8,
m2-mass of empty tube and resin before heating, g
-mass of empty tube and resin after heating, g.
_mz-ms×100
The test result is expressed as the arithmetic mean of two specimens, with two decimal places. 5.10 Determination of Thermal Stress Cracking Resistance
The thermal stress cracking resistance refers to the cracking resistance of the bending specimen with notches on the surface under the specified temperature and time conditions. 5.10.1 Specimen
The specimen is punched out from the test piece prepared in 5.2.2.5. Its length is 38mm±2mm and its width is 13mm±1mm. 5.10.2 Operation steps
Perform according to the provisions of GB1842. Among them:
a) Test temperature: 250℃±1℃;
b) Test time: 6h;
c) Test medium: air.
5.10.3 Result expression
HG/T 2904---- 1997
If there are visible new cracks on the surface of the sample, it is unqualified. 6 Inspection rules
6.1 Inspection is carried out in batches, and the maximum amount of production is a batch of polymerization kettles or mixing. 6.2 Each batch of products must be inspected by the quality inspection department of the manufacturer, and it is guaranteed that all products leaving the factory meet the requirements of this standard. Each batch of products should have a quality inspection report.
6.3 Inspection is divided into factory inspection and type inspection. Among the technical indicators in Table 3, (1) appearance, (2) melt flow rate, (3) tensile strength, and (4) elongation at break are mandatory items for each batch, and the rest are random inspection items, among which (6) melting point and (9) volatile matter are randomly inspected at least once every 25 batches; (5) relative density, (7) dielectric constant, and (8) dielectric loss tangent are randomly inspected at least once every 50 batches; (10) thermal stress cracking resistance is inspected according to the requirements of the purchaser. Type inspection is carried out in accordance with the provisions of 6.6.1 of GB/T1.3. 6.4 The user has the right to accept the received products in accordance with the provisions of this standard, and the acceptance inspection shall be carried out within one month of receiving the products.
6.5 Inspection results If any indicator does not meet the requirements of this standard, double samples should be randomly taken from the batch of products to re-inspect the unqualified items. If the re-inspection results still do not meet the requirements of this standard, the batch of products shall be unqualified. 6.6 When the supply and demand parties have any objections to the product quality, the two parties may negotiate to resolve the dispute or the statutory quality inspection department may conduct arbitration. 7 Marking, packaging, storage and transportation
7.1 Marking
The packaging barrel of this product should have a firm and clear label indicating the manufacturer's name, product name, product model, grade, net content, batch number or production date and this standard number.
7.2 Packaging
This product should be packaged in two layers of polyethylene plastic bags and then packed in hard barrels. The net content of each barrel shall not exceed 30kg. Each packaging barrel shall have a product certificate.
7.3 Storage and transportation
This product is transported as non-dangerous goods and should be protected from moisture and severe vibration during transportation. This product should be stored in a clean, cool and dry place to prevent rain, sunlight, moisture, dust and other impurities. 9413 Result Expression
The volatile matter is calculated according to formula (3):
Wherein: V-
volatile matter, %,
-mass of empty tube before heating, 8,
m2-mass of empty tube and resin before heating, g
-mass of empty tube and resin after heating, g.
_mz-ms×100
The test result is expressed as the arithmetic mean of two specimens, with two decimal places. 5.10 Determination of Thermal Stress Cracking Resistance
The thermal stress cracking resistance refers to the cracking resistance of the bending specimen with notches on the surface under the specified temperature and time conditions. 5.10.1 Specimen
The specimen is punched out from the test piece prepared in 5.2.2.5. Its length is 38mm±2mm and its width is 13mm±1mm. 5.10.2 Operation steps
Perform according to the provisions of GB1842. Among them:
a) Test temperature: 250℃±1℃;
b) Test time: 6h;
c) Test medium: air.
5.10.3 Result expression
HG/T 2904---- 1997
If there are visible new cracks on the surface of the sample, it is unqualified. 6 Inspection rules
6.1 Inspection is carried out in batches, and the maximum amount of production is a polymerization kettle or mixing. 6.2 Each batch of products must be inspected by the quality inspection department of the manufacturer, and it is guaranteed that all products leaving the factory meet the requirements of this standard. Each batch of products should have a quality inspection report.
6.3 Inspection is divided into factory inspection and type inspection. Among the technical indicators in Table 3, (1) appearance, (2) melt flow rate, (3) tensile strength, and (4) elongation at break are mandatory items for each batch, and the rest are random inspection items, among which (6) melting point and (9) volatile matter are randomly inspected at least once every 25 batches; (5) relative density, (7) dielectric constant, and (8) dielectric loss tangent are randomly inspected at least once every 50 batches; (10) thermal stress cracking resistance is inspected according to the requirements of the purchaser. Type inspection is carried out in accordance with the provisions of 6.6.1 of GB/T1.3. 6.4 The user has the right to accept the received products in accordance with the provisions of this standard, and the acceptance inspection shall be carried out within one month of receiving the products.
6.5 Inspection results If any indicator does not meet the requirements of this standard, double samples should be randomly taken from the batch of products to re-inspect the unqualified items. If the re-inspection results still do not meet the requirements of this standard, the batch of products shall be unqualified. 6.6 When the supply and demand parties have any objections to the product quality, the two parties may negotiate to resolve the dispute or the statutory quality inspection department may conduct arbitration. 7 Marking, packaging, storage and transportation
7.1 Marking
The packaging barrel of this product should have a firm and clear label indicating the manufacturer's name, product name, product model, grade, net content, batch number or production date and this standard number.
7.2 Packaging
This product should be packaged in two layers of polyethylene plastic bags and then packed in hard barrels. The net content of each barrel shall not exceed 30kg. Each packaging barrel shall have a product certificate.
7.3 Storage and transportation
This product is transported as non-dangerous goods and should be protected from moisture and severe vibration during transportation. This product should be stored in a clean, cool and dry place to prevent rain, sunlight, moisture, dust and other impurities. 9413 Result Expression
The volatile matter is calculated according to formula (3):
Wherein: V-
volatile matter, %,
-mass of empty tube before heating, 8,
m2-mass of empty tube and resin before heating, g
-mass of empty tube and resin after heating, g.
_mz-ms×100
The test result is expressed as the arithmetic mean of two specimens, with two decimal places. 5.10 Determination of Thermal Stress Cracking Resistance
The thermal stress cracking resistance refers to the cracking resistance of the bending specimen with notches on the surface under the specified temperature and time conditions. 5.10.1 Specimen
The specimen is punched out from the test piece prepared in 5.2.2.5. Its length is 38mm±2mm and its width is 13mm±1mm. 5.10.2 Operation steps
Perform according to the provisions of GB1842. Among them:
a) Test temperature: 250℃±1℃;
b) Test time: 6h;
c) Test medium: air.
5.10.3 Result expression
HG/T 2904---- 1997
If there are visible new cracks on the surface of the sample, it is unqualified. 6 Inspection rules
6.1 Inspection is carried out in batches, and the maximum amount of production is a polymerization kettle or mixing. 6.2 Each batch of products must be inspected by the quality inspection department of the manufacturer, and it is guaranteed that all products leaving the factory meet the requirements of this standard. Each batch of products should have a quality inspection report.
6.3 Inspection is divided into factory inspection and type inspection. Among the technical indicators in Table 3, (1) appearance, (2) melt flow rate, (3) tensile strength, and (4) elongation at break are mandatory items for each batch, and the rest are random inspection items, among which (6) melting point and (9) volatile matter are randomly inspected at least once every 25 batches; (5) relative density, (7) dielectric constant, and (8) dielectric loss tangent are randomly inspected at least once every 50 batches; (10) thermal stress cracking resistance is inspected according to the requirements of the purchaser. Type inspection is carried out in accordance with the provisions of 6.6.1 of GB/T1.3. 6.4 The user has the right to accept the received products in accordance with the provisions of this standard, and the acceptance inspection shall be carried out within one month of receiving the products.
6.5 Inspection results If any indicator does not meet the requirements of this standard, double samples should be randomly taken from the batch of products to re-inspect the unqualified items. If the re-inspection results still do not meet the requirements of this standard, the batch of products shall be unqualified. 6.6 When the supply and demand parties have any objections to the product quality, the two parties may negotiate to resolve the dispute or the statutory quality inspection department may conduct arbitration. 7 Marking, packaging, storage and transportation
7.1 Marking
The packaging barrel of this product should have a firm and clear label indicating the manufacturer's name, product name, product model, grade, net content, batch number or production date and this standard number.
7.2 Packaging
This product should be packaged in two layers of polyethylene plastic bags and then packed in hard barrels. The net content of each barrel shall not exceed 30kg. Each packaging barrel shall have a product certificate.
7.3 Storage and transportation
This product is transported as non-dangerous goods and should be protected from moisture and severe vibration during transportation. This product should be stored in a clean, cool and dry place to prevent rain, sunlight, moisture, dust and other impurities. 941
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