FOSTER FIRE RESISTIVE C.I. MASTICâ„¢ is a tough, durable, high solids, vapor retarder and weather barrier mastic for the protection of thermal insulation in outdoor service.
FIRE RESISTIVE C.I. MASTICâ„¢ may also be used on heated lines, vessels and equipment in intermittent or dual temperature service to prevent the entrance of water vapor into the insulation during off periods or on cold cycles. It is outdoor rated and UV resistant.

FIRE RESISTIVE C.I. MASTICâ„¢ is produced under the classification and follow-up service of Underwriter’s Laboratories, Inc.