Hawke's EMC are blocks with Electronic Compatibility and they are made from an intumescent flame retardant elastomer coated on all surfaces with a silver loaded spray which is highly conductive and provides the excellent shielding ability. In addition, a layer of adhesive copper strip is applied around the block to aid conductivity. Hawke blocks can accommodate cables ranging from 3mm to 100mm diameter, and include tolerant blocks which allow for variations in cable diameters by using five individual sealing faces which take up the cable variations within their