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