Fire retardant, flame retardant coatings

Flame retardant, Fire retardant

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Interior Top Coats Exterior Class "A" Varnish
Class "B" Varnish Special Coats Mastics for Struct Mastics for Elect


For details on application, maintenance & precautions, refer to can labels or product data sheets


Mastic No. 70 for Electrical Cable is a specially formulated asbestos free, water base, reinforced, intumescent fire retardant mastic, designed primarily for use on electrical or communication cables and their supporting trays, where it is either necessary or preferred to increase fire endurance time. When exposed to fire or high heat the coating intumesces (puffs up) , and forms a protective, dense foam barrier that shields the cables and trays, thereby retarding the penetration of heat and propagation of flame. Mastic No. 70 should be used where maximum fire protection is required. Dries to a tough, hard finish. Spray application at 1/16” wet film thickness results in an off white, fine stucco-like finish with dry film thickness of 31 mils.

Approvals and Standards:

* American Bureau of Shipping – Certificate No. 90-C20232-X
* Lloyd’s Register of Shipping Certificate No. SVG/F90/291
* 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
* ETL Testing Laboratories Report No. 4694526 – Effect on Ampacity: Current reduction at temperature stability – Less than 1%.

Mastic No. 77 for Electrical Cable is a water base, fire retardant coating compounded from proprietary fire retardant resins, chemicals and non-asbestos 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 substantially increases the fire endurance time of supporting trays.

No. 77 dries to a tough, hard finish with excellent abrasion resistance and good flexibility to withstand normal expansion and contraction, and is resistant to deterioration from flaking, impact, vibration and temperature changes. The coating will not dust, flake or spall. Spray application at 20.5 sq. ft./US results in an off-white, fine stucco-like finish.

Fire Tests:

Grouped cables were coated with Flame Control Mastic No. 77 to an average film thickness of 78 mils (1.98mm), 5/64 “, allowed to dry, and tested by a recognized testing laboratory according to requirements of The Institute of Electric and Electronic Engineers and were found to meet the requirements of:

  • IEEE-383-1974 Flame Test standard for Type Tests of Class IE Electrical Cables,Field\splices and connections for Nuclear Power Generating Stations, April 15, 1974
  • IEEE-45 Flammability Test, Recommended for Electrical Installations on Shipboard”, June 30, 1977

A test conducted by a qualified independent testing laboratory on the effect of coatings on ampacity, demonstrated a 0.8% electrical derating of cables coated with Mastic No. 77.


Lloyds Register of Shipping, Certificate No. Icd/F85/196 and American Bureau of Shipping, Certificate No. 85-C28913-X.



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