Flame Retardant Grade: FR70R

Flame retardant silicone rubber applications

TECHNICAL DATA – April 2016

Flame retardant silicone rubber is available in two grades from Advanced Materials, Villeater FR70R, which is detailed below, and FR70R.

FR70R is a flame retardant grade of silicone rubber.

Flame retardant silicone rubber is designed for use in the production of items with the following specifications:

Fire resistance

  • Flame resistance-vertical combustion: classification UL 94 VO, 2mm
  • Limit oxygen index (norm NF T 51071, 1985),%, approx. : 39
  • Incandescent wire (norm NF C 520455):class I2,( class I2= limit oxygen index ³ 32%, without flaming of the elastomer during and after application of the incandescent wire at 850° C

Opacity and toxicity of fumes

  • Smoke opacity to AFNOR norm NF X 10702 Smoke Index : S.I. approx. . : 4
  • Smoke toxicity to AFNOR norm NF X 70100 Conventional Toxicity Index : CIT. Approx. : 2.3
  • The FO class can be obtained from the results of these tests
Physical Properties
Shore A Hardness, points, approx 61
Secant modulus at 100% elongation, Mpa, approx 4.5
Tensile strength, Mpa, approx 7.8
Elongation at break, % approx. 165
Tear strength, KN/m, approx. 10
Rebound resistance, % approx 55
Dielectric properties
Dielectric strength(thickness 2mm), kV/mm, approx 22
Dielectric Constant at 1 MHz, approx 3.2
Power dissipation at 1 MHz, approx 5.3 x 10-3
Transversal resistivity, Ohm.cm, approx. % 2 x 10+15

Properties after thermal ageing~

 

10 days at 200° C 7 days at 250° C
Shore A Hardness, points, approx.

66

 67
Tensile strength, Mpa, approx.~~

7

 6
Elongation at break, % approx.

145

 110

 

Fire resistance:

Flame resistance-vertical combustion: classification UL 94 VO, 2mm

Limit oxygen index (norm NF T 51071, 1985),%, approx. : 39.

Incandescent wire (norm NF C 520455):class I2,( class I2= limit oxygen index ³ 32%, without flaming of the elastomer during and after application of the incandescent wire at 850° C

Opacity and toxicity of fumes:

Smoke opacity to AFNOR norm NF X 10702 Smoke Index : S.I. approx. . : 4

Smoke toxicity to AFNOR norm NF X 70100 Conventional Toxicity Index : CIT. Approx. : 2.3

The FO class can be obtained from the results of these tests