Silicone rubber mounting kits rvfm to220 kit srubber bulk silicone rubber insulated mounting kits for to220 devices consisting of a silicone rubber pad and insulating washer the pads are constructed from thermally conductive silicone rubber compound coated on to a layer of woven glassfibre to provide a strong flexible and clean insulator faster assembly times can be achieved over mica as there is no need to use messy and time consuming heatsink compounds rvfm to220 kit srubber bulk pk