BURN BARRIER™ Mastic No. 77 is a water base fire retardant coating, compounded from
proprietary fire retardant resins, chemicals, and nonasbestos reinforcing fibers. It has been
designed for use on grouped electrical cables and their supporting trays. No. 77 prevents the
propagation of fire along the cable surfaces, and greatly increases the fire endurance time of
supporting trays. No. 77 contains nonflammable solvents, and therefore, presents no fire hazard
while being applied. However, due care must be exercised when applying No. 77, as it is a
conductor of electricity while wet. See caution section.
Physical Properties: Weight per gallon: 12.0 % Solids by weight: 68.5
Consistency: Thixotropic % Solids by volume: 56
Abrasion Resistance: Excellent, dries to a tough hard finish.
Flexibility: Excellent withstands normal expansion and contraction.
Appearance: Spray application results in a textured fine stucco-like finish.
All dirt, oil, grease, and other foreign matter must be removed. Mask off surfaces not
designated for coating. All overspray should be cleaned up immediately.
Can be applied by brush or spray; however, spray application is recommended, as a more
uniform coverage can be obtained. Spraying should be done by heavy duty conventional or
airless spray equipment, to achieve a minimum wet film thickness of 5/64 inch (78 mils (1.98
mm)]. Dry film thickness 44 mile (1.1 mm). Grams/m = 2858.
Dries by water evaporation. Under normal atmospheric conditions, a 5/64 inch coating will dry
to touch within 2 hours, hard dry in 24 hours. It continues to cure to a very tough film that is
resistant to deterioration from flaking, impact, vibration, and temperature changes. Will not dust,
flake or spill.
Coverage: BURN BARRIER™ Mastic No. 77, when applied at 5/64 inch wet film thickness, will cover approximately 20.5 square feet of surface area.
Maintenance: Repairs can be made with brush, putty knife or trowel.
Thinning and Equipment Clean-up: Thinning is not recommended. For equipment clean-up, use water only.
Color: Off White. Special colors made to order.
BURN BARRIER™ Mastic must be protected from freezing at all times, and should be stored at temperatures between 40-95F.
BURN BARRIER™ Mastic contains water, and can conduct electricity until thoroughly dry.
Extreme caution must be exercised when the material is being applied, and until thoroughly dry.
Coating Effect On Ampacity:
Current reduction at temperature stability:
Less than 1% – ETL
Report No. 469526
BURN BARRIER™ Mastic No 77 is approved by and complies with the following flammability
American Bureau of Shipping – Certificate No. 99-Cl4508-X
China Corporation Register of Shipping – Certificate No. 328-01-5
Lloyd’s Register of Shipping – Certificate No. SVG/F90/292
IEEE-45 Recommended Practice for Electric Installations on Shipboard.
IEEE-383 Standard for Type Test of Class IE Electric Cables, Field Splices, and Connections for Nuclear
Power Generating Stations.
KEEP OUT OF REACH OF CHILDREN.
Information provided herein is based on information available at the time of printing. However, we make no guarantee or warranty that this product meet or complies with any federal, state local or foreign goverment code requirements. As we cannot anticipate all conditions under which this information and our products, or the products of other manufacturers in combination with our products may be used, we accept no responsibility for the results obtained by the application of this information or the safety and suitability of our products, either alone or or in combination for their own purposes. We sell our products without warranty or guarantee, and buyers and users assume all responsibility and liability for loss or damage arising from the use of this information, handling and use of our handling and use of our products whether used alone or in combination withe other products.