Buildtec Acoustic Sealant is a one-part flexible acrylic waterbased acoustic mastic. It is specifically formulated to form an acoustic and fire rated intumescent barrier by sealing gaps between plasterboard walls, floors and ceilings, dry linings, and lined insulation boards. It adheres to all construction substrates and can be painted within one hour, dependant on temperature and humidity.
Emulsion acrylic based it gives a ﬁrm yet ﬂexible seal to joints in a variety of ﬁre rated structures. It will not support combustion and when subjected to heat, chars and intumesces preventing the spread of smoke and ﬁre through the joint. S290 is a 4 hour rated intumescent sealant formulated with ﬁllers that provide noise reduction tested to BS 476: Part 20:1987 for ﬁre protection joints and in accordance with BS EN ISO 140-3:1995 for acoustic performance.