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EPDM Cold Shrinkable Tube

2023-04-17
In addition to the cold shrinkable termination kit produced by HUAYI CABLE ACCESSORIES Co.,Ltd., the cold shrinkable tube is made of silicone rubber material and EPDM rubber material. EPDM is a terpolymer of ethylene, propylene and unconjugated diolefin. Diolefin has a special structure. During copolymer reaction, only one active double bond takes part in the reaction, while the other less active double bond remains in the copolymer molecular chain to become the non-saturation point for sulfur sulfide.

The main chain of EPDM is saturated, which makes it resistant to heat, sunlight and ozone. Ethylene propylene diene rubber is essentially non-polar, resistant to polar solutions and chemicals, low water absorption, and has good insulation characteristics.

The main advantages of EPDM:

1. Cost-effective, raw rubber density is only 0.86 ~ 0.90kg/m3, is the lightest rubber density commonly used; And can be filled in large quantities to reduce the cost of rubber material.

2. Excellent aging resistance, weather resistance, ozone resistance, sunlight resistance, heat resistance, water resistance, water vapor resistance, ultraviolet resistance, radiation resistance and other aging properties, when used with other unsaturated diene rubber such as NR, SBR, BR, NBR, CR, etc., EPDM can play the role of high molecular antioxidant or antioxidant.

3. Excellent chemical resistance, acid, alkali, detergent, animal and plant oils, alcohols, ketones, etc.; Excellent resistance to water, hot water and steam; Resistance to polar oils.

4. Excellent insulation performance, volume resistivity 1016Q·cm, breakdown voltage 30 ~ 40MV/m, dielectric constant (1kHz, 20℃)2.27.

5. Suitable for a wide range of temperature, the lowest use temperature -40 ~ -60℃, can be used for a long time under the condition of 130℃.

It can also be seen from the above data that the cold shrink tube made by EPDM has excellent electrical performance, good mechanical performance, excellent physical and chemical performance, and relatively cheap raw materials. Relative to silica gel shrinkage tube, it can only be made of solid raw rubber, shrinkage ratio and resilience to be poor, insulation performance is not as good as silica gel, especially in the field of high pressure, while the production process is complex and the cost is relatively high, the market application accounts for a relatively small, the overall cost is much higher than the silica gel shrinkage tube.
cold shrinkable tube

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