... ,FDA,WRAS, etc. 2. Good quality low price. Description of High Performance Liquid Silicone Rubber :1. Materials: SI,also can be NR ... resistant, good insulation property, anti-toxic, good air-permeable, etc.3. Hardness: 30~90 shore A or IRHD as your request ... , tolerance is ± 5 shore A, and can be ±3 shore A for special products.4. Size tolerance: exactly upon ...