Some standard content:
GB/T8815—2002
This standard is a revision of QB/T3804--1999 (formerly GB8815-1988) "Soft polyvinyl chloride plastics for wires and cables". This standard is not equivalent to IEC60227-1:1993 "Polyvinyl chloride cables with rated voltages of 450/750V and below" and IEC "Extruded solid insulated power cables with rated voltages of 1 to 30kV". According to the National Bureau of Light Industry's document C1999J112, GB8815-1988 "Soft polyvinyl chloride plastics for wires and cables" has been transformed into the light industry standard QB/T3804-1999 after rectification. Compared with the previous version of the standard, in the product classification, HI-90 and J90 varieties are added, and J-80 and J-105 varieties are cancelled; in the technical requirements classification, the test method of 200C thermal stability time of HI-90 and J-90 is added; the relative density, flame retardant performance and long-term heat resistance evaluation test are added in the form of table notes, which serve as the basis for negotiation between the supply and demand parties when users need it. The test conditions for tensile strength and elongation at break, dielectric strength and dielectric loss factor are clearly stipulated. In the inspection rules, the sampling method and sampling volume are added. From the date of implementation, this standard will replace QB/T3804-1999 (formerly GB8815-1988). This standard is proposed by the China Light Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Plastic Products. The drafting units of this standard are: Shanghai Chemical Plant Co., Ltd., Shanghai Cable Research Institute. The main drafters of this standard are: Mu Xiaobin, Xiang Jian, Zhong Weiqin, Xia Weiqing, and Zhu Kejian. 534
National Standard of the People's Republic of China
Soft polyvinyl chloride (PVC) compounds for wire and cable
Plasticized polyvinyl chloride (PVC) compounds for wire and cable1Scope
GB/T 8815--2002
neg IEC 60227-1: 1993
Replaces GB8815:·1988
This standard specifies the product classification, technical requirements, test methods, inspection rules and packaging, marking, transportation and storage of soft polyvinyl chloride (PVC) compounds for wire and cable (hereinafter referred to as PVC cable materials). This standard is applicable to soft PVC plastics for wire and cable made of PVC resin as the main raw material, with plasticizers, stabilizers and other additives added, mixed, plasticized and granulated. 2Cited StandardsWww.bzxZ.net
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T1033--1986 Test method for density and relative density of plastics (eqvISO/DIS1183:1984) Test method for tensile properties of plastics
GB/T 1040--1992
GB/T1408.1-1999 Test method for electrical strength of solid insulating materials Test at power frequency (eqvIEC60243-1:1988) GB/T1409--1988 Test method for relative dielectric constant and dielectric loss factor of solid insulating materials at power frequency, audio frequency and high frequency (including meter wavelength) (eqvIEC60250:1969) Test method for volume resistivity and surface resistivity of solid insulating materials (eqvIEC60093:1980) GB/T 1410--1989
GB/T2406—1993 Test method for burning performance of plastics Oxygen index method (neqISO4589:1984) GB/T2951.7-1997 General test methods for cable insulation and sheathing materials Part 3: Special test methods for polyvinyl chloride mixtures Section 2: Weight loss test Thermal stability test [idtIEC811-3-2:1985No.1(1993) first amendment]
Test method for impact embrittlement temperature of plastics
GB/T 5470-1985
IEC261:1990 Guidelines for testing the long-term heat resistance of electrical insulating materials 3 Product classification
The models and names of various types of polyvinyl chloride cable materials are shown in Table 1. 3.1
Table 1 Models and names of various types of polyvinyl chloride cable materials Type
JGD-70
70C Insulation grade soft polyvinyl fluoride plastic
70C Soft insulation grade soft polyvinyl chloride plastic
70C Sheath grade soft polyvinyl chloride plastic
70C Soft Sheath grade soft polyvinyl chloride plastic
70C high electrical performance insulation grade soft polyvinyl chloride plasticApproved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on March 5, 2002Implementation on September 1, 2002
GB/T8815—2002
Table 1 (end)
Type 1 90℃ sheath grade soft polyvinyl chloride plastic
Type I 90°C sheath grade soft polyvinyl chloride plastic 90 Insulation grade soft polyvinyl chloride plastic
The main uses of various types of polyvinyl chloride cable materials are shown in Table 2. Table 2 Main uses of various types of polyvinyl chloride cable materials Model
JGD-70
3.3 Appearance
Maximum allowable working temperature of conductor core
Main use
Insulation layer of instrument communication cable, cable of 0.6/1kV and below Insulation layer of flexible wire and cable of 450/750V and below Sheath of wire and cable of 450/750V and below Sheath of power cable of 26/35kV and below
Sheath of flexible wire and cable of 450/750V and below Insulation layer of power cable of 3.6/6kV and below Sheath of power cable of 35kV and below and other similar cables Sheath of wire and cable of 450/750V and below Insulation layer of heat-resistant wire and cable of 450/750V and below Polyvinyl chloride cable material is a square granular material of about 4mm×4mm×3mm or a cylindrical granular material of considerable size. 3.4 Color
The colors of insulation grade polyvinyl nitride cable materials are red, black, yellow, blue, green, brown, etc., and the colors of sheath grade polyvinyl chloride cable materials are black, white, gray, etc. Other colors are determined by negotiation between the user and the manufacturer. 4 Technical requirements
4.1 Appearance
The polyvinyl chloride cable material should be well plasticized, uniform in color, and should not have obvious impurities. 4.2 The mechanical, physical and electrical properties of polyvinyl chloride cable materials shall comply with the provisions of Table 3 and Table 4. Table 3 Mechanical, physical and electrical properties of polyvinyl chloride cable materials
1. Tensile strength/MPa
2. Elongation at break/%
3. Thermal deformation/%
Test temperature/C
4. Impact embrittlement
Impact embrittlement performance
5. Thermal stability time at 200C/min≥
6. Volume resistivity at 20C/(2*m）
JGD-70
1.0×1Q121.0×10/1.0×1081.0×10%|3.0×10121.0×10°1.0×10%1.0×101in
7. Dielectric strength/MV/m
8. Dielectric loss factor (50Hz)
9. At working temperature
Volume resistivity
Test temperature/℃
Volume resistivity
GB/T8815—2002
Table 3 (end)
Relative density index is negotiated by both parties, and the relative density is generally not more than 1.10. 2 Flame retardant performance is assessed by oxygen index index, and the index value is determined by both parties. 3 According to user requirements, the manufacturer can provide a long-term heat resistance assessment report for the product. JGD-70
Mechanical and physical properties of polyvinyl chloride cable materials Table 4
Test temperature/C
Test time/h
1. Tensile strength after aging/MPa
2. Maximum change rate of tensile strength/%
3. Elongation at break after aging/%
4Maximum change rate of elongation at break/%
Test conditions
5． Thermal aging
Mass loss
Mass loss/g/m2≤.
Test method
Appearance inspection
100±2
100℃
±2℃
Observe with naked eyes under natural light.
100±2
±2℃
100±2
100℃
±2℃
100±2||tt ||±2℃
J GD-70
100±2
100℃
±2℃
100±2
100℃
±2℃| |tt||135±2|| tt||115℃
±2℃
135±2
115℃
±2℃
5.2 Sample preparation
After mixing the pellets, they are plasticized on an open mill at a temperature of (165 ± 5) °C for 5 min to 10 min, and then preheated, heated and pressurized, and pressurized in a hydraulic press at a temperature of (165 ± 5) °C. The cooling sequence is 15-20 minutes and the mold is removed. The thickness of the test piece should meet the requirements of each test item. Before the test, the marking line and thickness of the sample are calibrated and the test is carried out under this condition. 5.3 Tensile strength and elongation at break The measurement is carried out according to the provisions of GB/T1040. The specimen is type 1, the thickness is (1.0±0.1)mm, and the tensile speed is (250±50)mm/min. The specimens are conditioned for not less than 4 hours in an environment with a temperature of (23 ± 2) °C and a relative humidity of 45% to 55%. 5.4 Determination of thermal deformation
5.4.1 Specimens ||tt ||The specimen is a circular piece with a diameter of 12 mm, or a square piece with a side length of 12 mm, and a thickness of (1.25 ± 0.15) mm. 5.4.2 Test apparatus: See Figure 1 for the test apparatus. 537
GB/T 8815—2002
1—clamp; 2—positioning screw; 3—weight screw; 4—weight; 5—cylindrical pressure bar; 6—sample; 7—horizontal support Figure 1 Thermal deformation test equipment||tt ||5.4.2.1 Frame, consisting of clamping plates and positioning bolts. 5.4.2.2 Cylindrical weight, the mass of which should be such that the total downward pressure acting on the cylindrical pressure rod is 3.50 ± 0.02)N. 5.4.2.3 Cylindrical pressure bar, with a flat end and a diameter of (3.15 ± 0.03) mm. 5.4.2.4 Horizontal support for placing the specimen. When assembling the cylindrical pressure bar, the rack and the cylindrical weight, Make sure the center of gravity is at the lower end of the pressure rod; and when the lower end of the pressure rod is at the center of the sample, it does not touch other parts of the equipment. To prevent swinging, a guide device can be installed. 5.4.3 Test steps
At room temperature Measure the thickness of the specimen where pressure is applied. If a dry gauge is used, there should be a contact point of appropriate size and only slight pressure should be applied to the specimen. Place the test device and specimen separately in the oven and place them in a position that is free from Vibrate and keep the temperature at (120 ± 2) °C. After 1 hour, place the sample on a horizontal support and install a cylindrical weight to the sample pressure point, and keep the temperature constant for another 1 hour. Take out the entire test device from the oven and Cool at room temperature for 1 hour. Then remove the sample and immediately measure the thickness of the deformed portion of the sample with the instrument used at the beginning of the test. 5.4.4 Calculation and evaluation of test results
The thermal deformation D(%) is calculated according to formula (1).
D(%) =
Where: d. -Specimen Original thickness, mm; d-thickness of the sample after the test, mm.
× 100
The test result is the arithmetic mean of the two samples. If the deviation of the two sample results is within 10 % or more, the test is invalid and a new sample should be taken for testing.
5.5 Determination of impact embrittlement performance
The test shall be carried out in accordance with the provisions of GB/T5470.
5.6 Determination of thermal stability time at 200°C
5.6.1 Determination of thermal stability time of 70°C product series and HI-905.6.1.1 Test instruments
a) Glass beaker, capacity 1000mL, There is a small hole in the middle of the cup lid for the thermometer, and six small holes around it for the test tubes; 538
GB/T 8815—2002
b) Glass test tube, inner diameter (12~13) mm , 95mm high, with two circular marks on the test tube, the lower mark is 30mm from the bottom of the tube, and the upper mark is 70mm from the bottom of the tube;
c) Thermometer, the highest scale is 300℃, the accuracy is ±1C. 5.6.1.2 Test Steps
Place the granular sample in the test tube to the level of the lower mark. Then place a 5mm wide Congo red test paper ring in the test tube so that the lower edge of the test paper ring is at the upper mark. Then plug the test tube with a cork or rubber stopper and put in a glass of glycerol (the oil level should be such that the sample is completely immersed). Place the Congo red test paper in a beaker at a temperature of (200 ± 2)°C and start timing to the nearest minute. The time from when the lower edge of the Congo red test paper begins to turn blue is the thermal stability time. Arithmetic mean. 5.6.2 The thermal stability time of J-90 and H-90 at 200℃ shall be determined in accordance with GB/T2951.7. See Figure 2 for the test apparatus. 888888888
$13~$14
1--Thermometer; 2-test tube; 3-~-Congo red test paper; 4-sample Figure 2 Thermal stability test device
5.7 Determination of volume resistivity
5.7.1 Sample
Test The sample thickness is (1.0 ± 0.1) mm. To measure the volume resistivity at 20°C, the sample should be immersed in distilled water at (20 ± 2)°C for 24 hours and then immediately dried. To measure the volume resistivity at the working temperature, the sample The test should be carried out immediately after being kept in an oven at the test temperature for 1 hour. 5.7.2 Test conditions
5.7.2.1 Electrode treatment
When measuring the volume resistivity at the working temperature, the electrodes used shall be kept at the test temperature for 1 h. 5.7.2.2 In addition to the above conditions, all other conditions shall be The test voltage is 1000V. 5.8 The dielectric strength is measured in accordance with GB/T1408.1. The sample thickness is (1.0 ± 0.1) mm. The electrode is 25 mm thick. Symmetrical electrodes. Starting from zero, increase at a uniform rate of 2000V/s until breakdown occurs. When conducting dielectric strength tests, the transformer oil must be clean and fresh. 5.9 Determination of dielectric loss factor
GB/T 8815 —2002
Perform according to the provisions of GB/T1409. The thickness of the test piece is (1.0±0.1) mm. 5.10 Determination of thermal aging performance
5.10.1 Test equipment
5.10.1.1 Naturally ventilated electric heating aging box. The air entering the aging box should flow evenly over the surface of the sample and then pass through the aging box. Exhaust near the top. At the specified test temperature, the air in the aging box should be replaced no less than 8 times and no more than 20 times per hour. Rotating fans or blowers shall not be used in the aging box.
5.10.1.2 Analysis Balance, with an accuracy of 0.1 mg. 5.10.1.3 Tensile testing machine.
5.10.1.4 Desiccator filled with silica gel or similar desiccant. 5.10.2 Test steps
Put the sample in the desiccator Keep it in the ambient temperature for no less than 20 hours, and weigh it immediately after taking it out. Then hang the sample vertically in the middle of the aging box so that it is in the effective working area. After being treated at the specified temperature and time, take it out of the aging box immediately and put it back into the desiccator. After being placed at ambient temperature for 20 hours, weigh it again and measure the tensile strength and elongation at break according to 5.2 at the same time as the sample before heat aging. The distance between the samples in the aging box should be no less than 20 mm, and the sample volume should not exceed 0.5% of the aging box volume. Samples with different formulations cannot be tested at the same time.
5.10.3 Test results Calculate the
test results according to formula (2), (3) and (4). Vi(%) = 2
V2(%) = =Fm × 100
Wherein: V.·Tensile strength change rate after heat aging; r-tensile strength before heat aging, MPa;
al----Tensile strength after heat aging, MPa; V2---Change rate of elongation at break after heat aging; u---Elongation at break before heat aging, %; E--- Elongation at break after heat aging, %;
A--—Mass loss after heat aging?g/m;
G. -—Mass of the specimen before heat aging·g;||tt| |, mass of the sample after heat aging, g;
S is the surface area of the sample, m. The surface area of the
sample is calculated according to formula (5).
S = 3.72 × 10 -3 + 2. 79 × 10~5d Sample thickness, m.
Where:d—
The test result of mass loss is the arithmetic mean of five samples. 5.11 Relative density
According to GB3/T1033~-1986 A method - immersion method. 5.12 Oxygen index
According to GB/T2406.
5.13 Long-term thermal stability assessment.
According to IEC261.
(5)
6 Inspection rules
6.1 Batch
GB/T8815-2002
The inspection of polyvinyl chloride cable materials is carried out in batches. The polyvinyl chloride cable materials of the same variety and color produced continuously are regarded as a batch, and the mass of each batch shall not exceed 10t. If the production of a shift exceeds 10t, the production of the shift shall be regarded as a batch. 6.2 Sampling
Randomly select 3 packages from each batch, and take 1kg samples from each of the 3 packages. First inspect the appearance, and then mix it after it is judged to be qualified, in preparation for the test of other items.
6.3 Inspection classification
6.3.1 Factory inspection
Each batch of polyvinyl chloride cable materials must be inspected before leaving the factory. The inspection items should include: insulation level: impact embrittlement performance, volume resistivity at 20C, volume resistivity at working temperature and dielectric strength; sheath level: tensile strength, elongation at break, impact embrittlement performance 6.3.2 Type inspection
Type inspection is all items specified in the technical requirements. If there is one of the following situations, type inspection should be carried out. a) Trial formulation and identification of new products or old products transferred to the factory for production; b) Formal production, when the raw materials, formula or process conditions change, type inspection should also be carried out; c) During normal production, it should be carried out every six months; d) When the national quality supervision agency proposes a requirement for type inspection. 6.4 Judgment rules
If any performance item in the inspection result is unqualified, the test needs to be repeated. Randomly select pellets from twice the number of packages and re-test the unqualified items. If the re-test is qualified, the batch will be qualified. If it is still unqualified, the batch will be unqualified. 7 Packaging, marking, transportation, storage
7.1 Packaging
PVC cable materials are packed in plastic liner bags, and are packed in woven composite bags or other packaging bags agreed by both the supply and demand parties. The net weight of each bag is (25.0 ± 0.2) kg. Negative tolerance is not allowed per ton. 7.2 Marking
The packaging bag should be marked with: manufacturer name and address, product variety and model, batch number, color, manufacturing date, quality, standard number, and color mark.
7.3 Transportation
PVC cable materials should not be exposed to the sun and rain during transportation. 7.4 Storage
PVC cable materials should be stored in a clean, cool, dry and ventilated warehouse. The shelf life is two years from the date of production.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.