Firestop Mastic MC 1000


/ Firestop Mastic

Metacaulk® 1000 Intumescent Firestop Sealant

Material Safety Data Sheet

Firestop Product Information:

Metacaulk® 1000 is a water-based, flexible, highly intumescent sealant designed for use on metal, insulated, fiberglass and plastic pipes. It can also be used for top of the wall construction joints, as well as power and telephone cables. Sound Transmission Class (STC) rating 62, Tested in a UL 411 wall assembly/section to ASTM E90.

Firestop Additional Information:

Metacaulk® 1000 will prevent the spread of flames, smoke, hot gases and water through joint openings and through-penetrations. No dilution or mixing is required for use. No special skills are necessary for installation.

Metacaulk® 1000 has passed ASTM E 1966/UL 2079 for top of the wall applications with or with out backing and as little as 1/4 inch depth of caulk. The test assembly was also subjected to 500 cycles on a specially built machine that successfully demonstrated the product’s durability and movement characteristics.


Firestop Product Document Downloads:


Firestop Key Features:

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.

Firestop Typical Applications:




Product Codes And Case Sizes
Product Code Size Quantity UPC Interleaved Dimensions Cubic Feet
66640                     10.3oz cartridge  12   021449666404 10021449666401 8x6x12  .34
66312                    20.2oz Sausage Pk.  12 021449663120 10021449663127  9x14x7   .51
66303                 30oz cartridge     12   021449663038 10021449663035 11x9x17   .97
66305                       Gallon 021449663052 10021449663059 17x17x9  1.51
66307                     2 Gallon 021449663076 NA  14x13x10  1.05
66309             5 Gallon 1       021449663090 NA   13 diax14   1.08