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This standard was proposed by the Ministry of Light Industry of the People's Republic of China.
This standard is under the jurisdiction of the Institute of Plastics Processing and Application of Light Industry.
This standard refers to the Japanese industrial standard JIS C 2410-1975 (1988) PVC tubing for electrical insulation.
The department standard SG 79-74 Plasticized polyvinyl chloride tubing issued by the former Ministry of Light Industry of the People's Republic of China shall be abolished since the implementation date of this standard.
Plasticized polyvinyl chloride tubing for electrical insulation
1 Subject content and applicable scope
This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of plasticized polyvinyl chloride tube (hereinafter referred to as tube).
This standard is applicable to plasticized tube for electrical insulation by extrusion, which is mainly made of polyvinyl chloride resin. This tube is mainly for protecting the wire and cable at room temperature.
2 Normative references
GB 1.3
Directives for the work of standardization -Rules for drafting product standards
GB 1040 Plastics-Determination of tensile properties
GB 2828
Sampling procedures and tables for lot-by-lot inspection by attributes (Apply to inspection of successive lots or batches)
GB 7141 General rules of test methods for heat air aging of plastics by means of an oven
GB/T 13527.1 Plasticized polyvinyl chloride tubing for transport of fluids
3 Product model
DT represents the name of plasticized polyvinyl chloride tube, and d×δ is for the specification
For DT tube with an inner diameter (d) of 5.0mm and a wall thickness (δ) of 0.5 mm, its model is DT -5.0×0.5.
4 Technical requirements
4.1 The inner diameter, wall thickness and limit deviation shall meet those specified in Table 1.
Table 1
Inner diameter Wall thickness
Nominal inner diameter Limit deviation Nominal wall thickness Limit deviation
1.0 +0.15
-0.10 0.4 ±0.08
1.5 +0.30
-0.15
2.0 +0.30
-0.20
2.5
3.0 0.5 +0.10
-0.08
3.5
4.0 +0.40
-0.30
4.5
5.0
6.0
7.0 +0.60
-0.40
8.0
9.0
10.0 0.6 +0.12
-0.06
12.0 +1.00
-0.50
14.0
16.0
18.0 +1.20
-0.80 1.0 +0.15
-0.06
20.0
22.0
25.0
28.0 1.2 +0.20
-0.06
30.0
34.0
36.0 +1.50
-1.00
40.0 1.6
Note: Through negotiation with the units used and the manufacturer, tubes with other specifications can be produced.
4.2 Appearance
The internal and external walls of the tube shall be smooth and uniform in color, and free of bubbles, discoloration decomposition line and impurities of more than 1mm; for impurities of less than 1mm, they are not more than 10 within 1m, and not in groups.
4.3 Color
The color of tube: natural color, white, yellow, green, blue, red and black.
Note: Through negotiation with the units used and the manufacturer, tubes with other colors can be produced.
4.4 Length
The length of the tube is not less than 10m.
4.5 The physical and mechanical properties shall meet those specified in Table 2.
Table 2
Item Indicator
Tensile strength: MPa ≥15
Elongation at break, % ≥150
Heat aging performance Residual rate of tensile strength, % ≥90
Residual rate of elongation at break, % ≥70
Oil resistance Residual rate of tensile strength, % ≥70
Residual rate of elongation at break, % ≥70
Insulation resistance, MΩ·m ≥1000
Withstand voltage (5000V 1 min) No breakdown
Heat resistance Thickness deformation rate, % ≤10
Length shrinkage rate, % ≤10
Low temperature test (-20±2℃) No crack on surface
Self-extinguishing Extinguish within 15s after leaving flame
5 Test methods
5.1 Dimension
It shall be carried out in accordance with the requirements of Sub-clause 5.1 of GB/T 13527.1
5.2 Appearance
It shall be carried out in accordance with the requirements of Sub-clause 5.2 of GB/T 13527.1
Foreword i
1 Subject content and applicable scope
2 Normative references
3 Product model
4 Technical requirements
5 Test methods
6 Inspection rules
7 Marking, packaging, transportation and storage
