ROCOL SAPPHIRE Aqua-Sil is a high temperature, translucent silicone grease approved for use with potable water. Designed for the lubrication of slow speed bearings, slides and similar applications. Compatible with most rubbers and plastics, ideal for the assembly of rubber 'O' rings and seals. It also offers good resistance to chemicals, oils, water and gasses. Water Regulations Advisory Scheme Approved Product. Specification Temperature Range -40C to +200C.