Rubber Insulated Cables

Rubber insulation holds its vital role in specific application where high flexibility and comparatively high temperature is required. Rubber insulation also permits simple splices and terminations. Sythetic rubber such as butyle rubber, Etnylene Propylene rubber, Poly Chloroprene rubber, Chlorosulphunated polyethylene rubber have better heat resistance, oil resistance and resistance against influence as compared to natural rubber. Out of all the synthetic rubber, silicon rubber has excellent die-electric characteristics. It is possible to operate silicon rubber insulated cables at ambient temperature of upto 180^oC continuously. The polychloroprene rubber, chlorosulphonatated, nitrille sheating are formulated against high abrasion, oil, weather and fire resistance properties. EPR insulation with CSP sheathing can withstand high ambient condition having long durable ageing properties.

For selection of right type of Elastometric cable, the comparative characteristic have been in chart given below.

Materials	Natural Rubber (NR)	Styerence Butadiene (SBR)	Ethylene Propylene Rubber (EPR)	Poly-chloroprene Rubber (PCP)	Nitrile Butadiene Rubber (NBR)	Chloro Sulphonated (CSP)	Silicon Rubber
MECHANICAL PROPERTIES
Tensile Strength	E	G	G	G	F	G	F
Tear Resistance	E	F	P	G	G	G	G
Abrasion Resistance	E	E	G	G	E	G	F
Impact Resistance	E	E	F	G	G	G	G
Impermeability Gas	G	F	G	G	G	E	P
DURABILITY
Water Resistance	F	F	G	E	G	E	E
Ozon Resistance	P	P	E	G	G	E	E
Acid Resistance	G	G	G	G	F	E	P
Alkali Resistance	G	G	G	G	F	E	P
Flame Resistance	P	P	P	G	E	E	F
Gasolin Kerosene etc. Resistance	P	P	P	G	E	E	F
Degreaser Solvent Resistance	P	P	P	G	E	G	G
Oxidation Resistance	P	F	G	G	F	E	E
ELECTRICAL PROPERTIES
	G	G	G	P	P	F	G
Insulation Resistance	G	G	G	F	F	G	G
Voltage Breakdown	G	G	G		F	G	G
A.C. Losses	60	60	90	90	90	95	150
Cont. Limited Temp. Deg C continuous Operation	150	150	180	150	150	160	250
	150	150	250	160	160	200	350

P-POOR,       F-FAIR,       G-GOOD,       E-EXCELLENT