Material Properties

Insulation & Sheath Material Properties In General

Characteristics of Elastomeric Insulating and Sheath Materials
Designation Electrical
VDE initial- code Abbre-viations Materials Density Break down voltage Specific volume resistivity Dielectric-constant Dielectric loss factor tan δ
g/cm3 KV/mm (20°C) Ohm·cm 20°C 50 Hz/20°C
G NR SBR Natural rubber Styrene-butadiene rubber 1,5-1,7 20 1012–1015 3-5 1,9 x 10–2
2G SiR Silicon rubber 1,2-1,3 20 1015 3-4 6x 10–3
3G EPR Ethylene Propylene Rubber compounds 1,3-1,55 20 1014 3-3,8 3,4 x 10–3
4G EVA Ethylene vinyl acetate compounds 1,3-1,5 30 1012 5-6,5 2 x 10–2
5G

CR

 Polychloroprene compounds 1,4-1,65 20 1010 6-8,5 5 x 10–2
6G CSM Chlorosulphonated polyethylene compounds 1,3-1,6 25 1012 6-9 2,8 x 10–2

 

 EPDM Ethylene-propylene-diene elastomer 0,86-2,0 35 1012 2,2-3,0 0,5 x 10–3-1x 10–2

 

 NBR Nitrile butadiene rubber 1,0-1,49 20 1014-1015 6-8,5 5 x 10–2-5,5 x 10–2

 

 NBR/PVC Nitrile butadiene rubber/ Polyvinylchloride 0,144-0,24 20 1010 6-8,5 5 x 10–2

 

 BR Polybutadiene 0,9-1,0 20 1010 3-4 5 x 10–2
Designation Thermic
VDE initial- code Abbre-viations Materials Working temp. Melt-temp Oxygen index LOI Heating value H0 Thermal-conductivity Corrosive gases in case of fire Radiation resistance
Permanent (°C) Short time(°C) +°C (% O2) MJ·kg-1 W·K-1·m-1

 

 Mrad
G NR SBR Natural rubber Styrene-butadiene rubber – 65+ 60 +120 — %22 21–25 — No 100
2G SiR Silicon rubber – 60+180 +260 — 25–35 17–19 0,22 50
3G EPR Ethylene Propylene Rubber compounds – 30+ 90 +160 — %22 21–25 — 200
4G EVA Ethylene vinyl acetate compounds – 30+125 +200 — 19–23 — 100
5G CR Polychloro-prene compounds – 40+100 +140 — 30–35 14–19 — Hydrogen chloride 50
6G CSM Chlorosul-phonated polyethylene compounds – 30+ 80 +140 +160 19–23 —

 

 EPDM Ethylene-propylene-diene elastomer – 30+110 +120 +160 30–35 14–19 0,26 No 50

 

 NBR Nitrile butadiene rubber – 40+110 +140 +160 30–35 14–19 0,25 No 50

 

 NBR/PVC Nitrile butadiene rubber/ Polyvinylchloride – 40+105 +140 +160 28 14–19 0,25 Hydrogen chloride 50

 

 BR Polybutadiene –70+70 +140 +160 30–35 14–19 0,25 No 50
Designation Mechanical Halogen
VDE initial-code Abbre-viations Materials Tensile strength Elongation at break Shore hardness Water absorbtion Halogen-free
N/mm2 % %

 
G NR SBR Natural rubber Styrene-butadiene rubber 5–10 300–600 60–70 (A) 1,0 No
2G SiR Silicon rubber 40–80 (A) Yes
3G EPR Ethylene Propylene Rubber compounds

 

 200–400 65–85 (A)
4G EVA Ethylene vinyl acetate compounds 8–12 250–350 70–80 (A) No
5G CR Polychloroprene compounds 10–20 400–700 55–70 (A) No
6G CSM Chlorosulphonated polyethylene compounds 350–600

 

 60–70 (A)

 

 1,5

 

 

 EPDM Ethylene-propylene-diene elastomer 10-25 250-500 40–90 (A) 0.2 Yes

 

 NBR Nitrile butadiene rubber 10-25 350-650 40–90 (A) 1 Yes

 

 NBR/PVC Nitrile butadiene rubber/ Polyvinylchloride 10-20 400-700 80-90 (A) 1 No

 

 BR Polybutadiene 10-15 200-400 48–80 (A) 1 Yes

P = Poor; F= Fair; G = Good; E = Excellent; O = Outstanding

Designation Properties
VDE initial- code Abbre-viations Materials Oxidation resistance Heat resistance Oil resistance Low-tempe-rature flexibility Weather, sun resistance Ozone resistance Abrasion resistance Flame resistance
G NR SBR Natural rubbe

 

 F F P G F P E P
Styrene-butadiene rubber G F P E F P E P
2G SiR Silicon rubber E G F-G O O O F F-G
3G EPR Ethylene Propylene Rubber compounds G E F G-E E E G P
4G EVA Ethylene vinyl acetate compounds G G G F-G G-E G G-E P
5G CR Polychloro-prene compounds G G G F-G G G G-E G
6G CSM Chlorosul-phonated polyethylene compounds E E G F E E G G

 

 EPDM Ethylene-propylene-diene elastomer E E P G-E E E G P

 

 NBR Nitrile butadiene rubber F G G-E F F-G P G-E P

 

 NBR/PVC Nitrile butadiene rubber/ Polyvinylchloride E G G F G G E G

 

 BR Polybutadiene G F P E F P E P

P = Poor; F= Fair; G = Good; E = Excellent; O = Outstanding

Designation Properties
VDE initial- code Abbre-viations Materials Water resistance Acid resistance Alkali resistance Aliphatic hydrocarbons resistance (Gasoline, kerosene, etc) Aromatic hydrocarbons resistance (Benzol, toluol, etc.) Halogenated hydrocarbons resistance (Degreaser solvents) Alcohol resistance
G NR SBR Natural rubber G-E F-G F-G P P P G
Styrene-butadiene rubber E F-G F-G P P P G
2G SiR Silicon rubber G-E F-G F-G P-F P P-G G
3G EPR Ethylene Propylene Rubber compounds G-E G-E G-E P F P P
4G EVA Ethylene vinyl acetate compounds G G G G P-F P F
5G CR Polychloro-prene compounds G G G G P-F P F
6G CSM Chlorosul-phonated polyethylene compounds G-E E E F F P-F G

 

 EPDM Ethylene-propylene-diene elastomer G-E G-E G-E P F P P

 

 NBR Nitrile butadiene rubber G-E G F-G E G P E

 

 NBR/PV

 

 Nitrile butadiene rubber/ Polyvinylchloride E G G G-E G G G

 

 BR Polybutadiene E F-G F-G P P P F-G

P = Poor; F= Fair; G = Good; E = Excellent; O = Outstanding