Insulation characteristics

TYPICAL CHARACTERISTICS OF VARIOUS INSULATION MATERIAL FOR CABLES
  Insulation compounds
  Thermoplastics Crosslinked materials
Abbreviation (1) PVC PE PBT-FR TPE-E ETFE FEP PTFE EPR PE-X RX 125 RX 1555 RX 155 PVDF-X SIR
CENELEC-type T11             E16            
Thermal characteristics
Thermal resistance 20,000 h (°C) 70 70 110 110 135 180 250 90 90 120 130 135 135 180
Thermal resistance 24 h (°C) 100 100 160 160 220 240 300 180 180 200 220 220 220 260
Short circuit (°C) 160 100 160 160 250 250 300 250 250 280 280 280 300 350
Resistance to cold, moving (°C) -5 -55 -40 -40 -55 -55 -70 -40 -55 -40 -55 -55 -55 -55
Mechanical characteristics
Tensile strength (N/mm²) >12.5 >10 >25 >30 >30 >10 >20 >5.0 >12.5 >12.5 >12.5 >15 >28 >5.0
Elongation at break (%) >125 >300 >200 >150 >200 >200 >200 >200 >200 >200 >200 >200 >200 >150
Abrasion resistance S Good Good E E S S S E Good E Good E poor
Flexibility (2) S poor poor poor poor poor poor poor poor S poor S poor E
Electrical characteristics
Volume resistivity at 20°C (Ωcm) 10 e14 10 e16 10 e15 10 e15 10 e16 10 e18 10 e18 10 e15 10 e16 10 e14 10 e16 10 e16 10 e14 10 e15
Dielectric constant at 1 kHz 5.0 2.3 3.7 3.8 2.6 2.2 2.0 3.0 2.4 4.2 2.6 2.8 5.7 3.0
Fire characteristics
Flame retardant Yes No Yes No Yes Yes Yes No No Yes Yes Yes Yes Yes
Halogen free No Yes Yes Yes No No No Yes Yes Yes No No No Yes
Corrosive combustion gases Yes No No No Yes Yes Yes No No No Yes Yes Yes No
Smoke generation Strong aver. aver. aver. low low low aver. aver. low strong strong low aver.
Resistance to
Ionizing radiation (kGy) 100 1000 1000 1000 2000 100 100 2000 1000 1000 1000 1000 1000 500
Solvents (3) S S Good Good E E E S S S Good S E S
Oils and fuels (3) S S Good Good E E E poor S S Good S E S
Acids and alkaline solutions (3) Good E S S E E E E E Good Good Good E S
Water/Hydrolysis (3) Good E S S E E E Good E Good E E E E
Weather/UV radiation Good poor Good Good E E E Good S Good Good Good E E

Förkortningar: E = Excellent, S = Satisfactoring, aver. = average

(1) RX = RADOX, for other abbreviations, see Material designations.

(2) depends greatly on cable construction

(3) influenced by type, time and medium temperature