| Quality | Hardness (ShoreA) | Specific Gravity(g/m³) | Tensile Strength | Elongation At Break | Temperature Range(℃) |
| NR/SBR | 65±5 | 1.45 | 6 | 250 | -30~+70 |
| heat ageing 70°c | hardness | tensile Strength(%) | elogation at break(%) | ||
| +5 max | +20/-20 | +25/-25 | |||
| resistance | ozone resistance | oil resistance | concentrated acids and bases | dilute acids and bases | solvents |
not recommended | not recommended | not recommended | fair | not recommended |