Metacaulk® 1200 Firestop Mastic

Metacaulk® 1200 Firestop Mastic


  • Extremely flexible cure
  • Excellent dynamic movement characteristics
  • Excellent Freeze-thaw
  • STC rating 65
  • UL Classified up to 4 hrs
  • Mold inhibitor tested to ASTM G21
  • 3 year shelf life
  • Download Image Spray Group

Metacaulk® 1200 is a single component, highly elastomeric water based firestop mastic for construction joints such as top of the wall, curtain wall perimeter, expansion,control, etc. and for general construction gaps and voids.

Metacaulk®1200 is a water based sealant that comes in two different grades. Metacaulk® 1200 mastic grade is designed for spray applications and provides a fast, economical means of installation on long joint runs.

It cures to an elastomeric membrane seal that is suitable where dynamic movement is expected. Can be applied to horizontal and vertical surfaces for interior and covered exterior application that cures to a paintable elastomeric membrane seal. Application temperature 40°F to 120°F.

Tested to ASTM E 1966 (UL2079, CAN/ULC S115, ASTM E 814 (UL 1479) & ASTM E1399


VOC+ Environmental

FBC™ System Compatible indicates that this product has been tested, and is monitored on an ongoing basis, to assure its chemical compatibility with FlowGuard Gold®, BlazeMaster® and Corzan® pipe and fittings. FBC™, FlowGuard Gold®, BlazeMaster® and Corzan® are licensed trademarks of The Lubrizol Corporation.

Product Codes And Case Sizes
Product CodeSizeQuantityUPCInterleavedDimensionsCubic Feet
665295 Gal. Spray (USA)1021449665292NA13 diax14 1.08
663795 Gal. Spray1021449663793 NA13 diax14 1.08
66527 5 Gal. Spray1021449665278 NA13 diax14 1.08
665265 Gal. Spray (USA)1021449665261NA13 diax14 1.08