Dow Corning 991 is medium-modulus elastomeric sealant designed for
weather-proofing sensitive porous stone and metal panel substrates.
Dow Corning 991 Silicone High Performance Sealant is particularly effective for
sealing expansion and control joints, metal panel joints, curtainwall joints,
joints between natural stone and perimeter seals around window frames. It forms a
durable, flexible, watertight bond with most building materials.
ow Corning 991 Silicone High Performance Sealant is intended to be applied in new and remedial construction.
Improved aesthetic performance reduces long-term resu\idue rundown on metal panels and reflective glass or
staining on porous substrates.
Good working time and tooling time.
All-temperature gunnability from -29 to 50C (-20 to 122F), permitting application in all seasons.
Medium modulus, high movement capability - can accomdate +/_ 50 percent movement in a properly designed joint.
Unprimed adhesion to most glass, granite, GFRC and fluropolymer painted substrates.