Resistance

Pending formulations differ in the type of plasticizer. Plasticized recipe contains 251 dioctyl (DOP) and is obtained by less energy-intensive processing, which allows to apply the insulation at high speeds. Plasticized formulation contains 230 dialkilftalat (DAP) has a high specific volume electrical resistance and is tropikostoykim (it practically does not develop fungus and mold). Hose 239 recipes and 288 plastic grade 0-40 manufactured using different phthalate plasticizers. Dialkilftalat 239 makes PVC Plasticized tropikostoykim more than 288 plastic compound. The presence of PVC plastic softener makes the dependence of various mechanical, electrical and other characteristics of the temperature more pronounced and complex than the polyvinyl chloride resin. Reduction of specific volume electrical resistance of PVC plastic with an increase in various formulations temperature is taken into account in the standard and monitored at 20 and 70 C. PVC is widely used for insulation installation, assembly and special wires, power cables for voltage 6.1 kV and control cables.

In hose plastic, but the main plasticizer, added 15-20% tricresyl phosphate, which increases the resistance of PVC plastic to combustion. The increase of plasticizer to 50-60% leads to an increase in the relative elongation at break and lower tensile strength of PVC hose. As the temperature rises sharply increase the value and tg, PVC plastic compound can not be widely used in high voltage power cables in a voltage of 10 kV and as insulation in the wires of communication. To create a cold-resistant PVC grades 0-50, 0-55 and OMB-60 with a temperature of minus fragility – 50 minus 60 C using 60-70% of a plasticizer (or dioktilsebatsionat diizodetsiadipinat), but the tensile strength is reduced to 11 and sometimes up to 10 MPa.

Cambridge Biographical Center

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