FOSTER MONOLAR MASTIC is a tough, flexible, fire-resistive, elastomeric finish for protection of outdoor thermal insulation. It contains chlorosulfonated polyethylene rubber (formerly known as Hypalon*). It is an excellent vapor retarder for low temperature insulation on tanks, pipework, ductwork, vessels and fittings.

MONOLAR MASTIC is produced under the classification and follow-up service of Underwriter’s Laboratories, Inc.