Flame Retardant Grade: FR70R
Flame retardant silicone rubber applications
TECHNICAL DATA – July 2011
Flame retardant silicone rubber is available in one grade from Advanced Materials, FR75RP, which is detailed below.
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