Appearance: colorless or nearly colorless and transparent granular material free from foreign impurities
Physical and mechanical properties of hardness (Shore A) ≤ 80    > 80
Tensile strength MPa ≥ 13.0 ≥ 13.0
Elongation at break% ≥ 250 ≥ 250
180 degree heat stability time min ≥ 40