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Flame Retardant Grade: FR70R

Flame retardant silicone rubber applications

TECHNICAL DATA - July 2011

Flame retardant silicone rubber is available in two grades from Advanced Materials, FR75RP, which is detailed below, and FR60RP.

FR75RP 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, 3mm
  • Limit oxygen index (norm NF T 51071, 1985),%, approx. : 35.
  • 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. . : 6.
  • Smoke toxicity to AFNOR norm NF X 70100 Conventional Toxicity Index : CIT. Approx. : 2.7
  • The FO class can be obtained from the results of these test

Physical Properties

Shore A Hardness, points, approx

68

Secant modulus at 100% elongation, Mpa, approx

3.6

Tensile strength, Mpa, approx

9.0

Elongation at break, % approx.

270

Tear strength, KN/m, approx.

15

Rebound resistance, % approx

47

 

Dielectric properties

Dielectric strength(thickness 2mm), kV/mm, approx

20

Dielectric Constant at 1 MHz, approx

3.2

Power dissipation at 1 MHz, approx

5.3 x 10-3

Transversal resistivity, Ohm.cm, approx. %

1.4 x 10+15

Properties after thermal ageing

 

10 days at 200° C

7 days at 250° C

Shore A Hardness, points, approx.

76

77

Tensile strength, Mpa, approx.

7.3

5.9

Elongation at break, % approx.

200

130

Fire resistance:

Flame resistance-vertical combustion: classification UL 94 VO, 3mm

Limit oxygen index (norm NF T 51071, 1985),%, approx. : 35.

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. . : 6.

Smoke toxicity to AFNOR norm NF X 70100 Conventional Toxicity Index : CIT. Approx. : 2.7

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