A soft and extremely tacky mixture of rubber and softener applied to a fabric by means of a three-roll calender. The differential speed of the calender rolls drives the material into the interstices of the fabric, forming a strongly adherent coating. Uncured friction on a light sheeting is used for electrical insulating or friction tape. Heavy-weave fabric coated with high-grade friction (rubber plus softener and curing agents) is used as piles in tire carcasses, transmission belts, and other laminated products that are vulcanized.See Calender.