Unit A, 21/F, KP Tower, 93 King’s Road, North Point, Hong Kong(852) 2911 0103

Burn Barrier 50-44

Burn Barrier 50-44 Low VOC Structural Steel Mastic

BURN BARRIER™ structural steel mastic 50-44 is an asbestos free reinforced Intumescent thermal protective coating, designed for application to interior structural steel, where it is necessary or desirous to increase the steel fire endurance time.

Mastic FR. 50-44, when applied at a wet film thickness of 3/16 inch (8.55 sq.ft./U.S. gallon) [4.76mm (0.21 m2/L), on W8 x 24 and W8 x 28] (W200 x 36 and W200 x 42), and on 6 x 10 inch (152 x 235MM) wood beams,as described in ULC design numbers 0600, M600, R600, and fire tested in accordance with ASTM E-119 (UL-263, ULC-CAN 4-5101, NFPA-251) has been assigned fire resistant rating of 1 hours depending on the design and components used, reference Underwriters’ laboratories label and test reports. The coating dries to a hard, flexible finish that withstands structural movement and vibrations, does not dust, flake, spill or crack.


Spray application yields a textured, stucco-like finish, or can be lightly troweled to a relatively smooth finish.


Surface Preparation:

Mill scale, surface rust, grease, dirt, and dust should be removed. Steel should be primed with flame Control No. 3004 Universal Metal Primer, No. 3005 Two Part Epoxy Primer or other good quality metal primer. Allow primer to thoroughly dry before applying Mastic BURN BARRIER™ 50-44.


Mixing Instructions:

Using a Jiffler double-bladed mixer, thoroughly mix Mastic BURN BARRIER™ 50-44. For SPRAY GUN application, generally each 5 gallon pail should be thinned (diluted) with approximately 1 quart of xylene (xylol). For HOPPER GUN application additional thinning may be required to obtain good flow in the hopper.

Application Equipment and Procedures

Mastic BURN BARRIER™. 50-44 can be spray or trowel applied.


When TROWEL applied, the tools must be kept wet with mineral spirits to avoid sticking or pulling. For HOPPER GUN application, use a 1/4 inch gun nozzle opening, with approximately 25 to 30 lbs. air pressure-HEAVY DUTY SPRAY, suggest Graco Equipment:


GUN Model No. 204-000, Series G9H.


TIP: External mix, horn type No. 163-660.


PUMP: President 10-1 texture, equipped with even flow valve system.



Material: 3/4 inch ID (minimum), solvent resistant, reinforced, with a 5 foot long, 3/4 inch ID whip section at gun,fitting at gun should be quick connecting swivel type. Maximum hose length 100 feet.


AIR HOSE TO GUN: 3/8 inch ID (minimum).


AIR COMPRESSOR TO PUMP HOSE: 3/4 inch ID (minimum).


COMPRESSOR: Must be capable of maintaining 85 PSI (minimum) when straying. The above equipment is given as a guide. Other manufacturer’s equipment meeting similar specification can be used.


Start UP Procedures for Heavy Duty Equipment:

STEP 1 Follow “CAUTION” section. Place CAUTION signs in area, warning others that spray painting is in progress, and that flammable vapors are present in the area. Check to ensure that all flames, fires, and other sources of ignition have been extinguished and turned off. Coated area must remain roped off, with CAUTION, FLAMMABLE VAPOR” signs until the coating has thoroughly dried.


STEP 2. Pumn, hoses, and gun must be clean. Set up equipment and place pump in empty open-head. 55 gallon drum.


STEP 3 Using a Jiffler double bladed mixer, thoroughly mix 4 to 8 five gallon pails of Flame Control Mastic BURN BARRIER™. 50-44. Each five gallon pail should be thinned (diluted) with approximately 1 quart of xylene (xylol).


STEP 4 Dump the thinned (diluted), thoroughly mixed, Mastic BURN BARRIER™ .50-44 into the 55 gallon



STEP 5 Remove fluid hose at gun and start puma. Pump until mastic has completely filled the material hose, then reattach the hose to the gun.


STEP 6 Adjust evenflow valves to obtain the following pressure settings; Material, 15 to 35 PSI, Atomizing air, 20 to 40 PSI. These pressure settings are generally suitable for most conditions. Material pressure should be kept at the lowest possible setting to obtain a smooth uniform flow.


STEP 7 Test spray a small area, adjust pressure settings to obtain a good spray pattern,then proceed with the application. Check wet film every few minutes, to insure that the proper film thickness is being applied. Be sure all surfaces, including edges, are properly coated. NOTE If spraying is to be discontinued for more than 3 or 4 minutes, the material pressure should be shut off at the pump. Release the material line pressure by triggering the gun, then remove the material hose at the gun and wash out gun in xylene (xylol). This procedure is very important to prevent material from packing up at the gun arid in the hose.


Clean Up:
Clean equipment immediately after use with Xylene (xylol) or mineral spirits.


Drying Time:
Dries to touch in about 2 hours, hard enough for area use in 24 to 48 hours (See CAUTION section). Continues to cure to a very tough film. Full cure; under normal drying conditions, the coating will fully cure in 5 to 8 days. The speed of cure depends on the air temperature and humidity.


Should an area be damaged, the coating can easily be repaired, using a putty knife or trowel.



Before starting job, place CAUTION signs in area, warning others that painting is in progress, and the FLAMMABLE VAPORS are present in the area. Check to ensure that all flames and other sources of ignition have been turned off and are extinguished. Coated area MUST remain roped off, with “CAUTION, FLAMMABLE VAPOR” signs until the coating has thoroughly dried. The coating contains volatile (FLAMMABLE) solvents. Care must be exercised during and after application until the coating is fully dried, to minimize the possibility of an accumulation of  flammable vapors. Such accumulations may be indicated by strong solvent odors.




NOTICE: Reports have associated repeated and prolonged occupational overexposure to solvents with permanent brain and nervous system damage. Intentional misuse by deliberately concentrating and inhaling the contents may be harmful or fatal. Keep away from heat, sparks and flame. VAPORS MAY CAUSE FLASH FIRE. Do not smoke. Extinguish all flames and pilot lights, and turn off stoves, heaters, electric motors and other sources of ignition during use and until all vapors are gone. Prevent build-up of vapors by opening all windows and doors to achieve cross-ventilation. USE ONLY WITH ADEQUATE VENTILATION. Do not breathe vapors or spray mist. Ensure fresh air entry during application and drying. If you experience eye watering, headache or dizziness or if air monitoring demonstrates vapor/mist levels are above applicable limits, wear an appropriate, properly fitted respirator (NIOSH/MSHA approved) during and after application. Follow respirator manufacturer’s directions for respirator use. Close container after each use. Avoid contact with eyes, skin and clothing. Wash thoroughly after handling.


FIRST AID: If you experience difficulty in breathing, leave the area to obtain fresh air. If continued difficulty is experienced, get medical assistance immediately. In case of eye contact, flush immediately with plenty of water for at least 15 minutes and get medical attention; for skin, wash thoroughly with soap and water. If swallowed, get medical attention immediately. If spilled, contain spilled material and remove with inert absorbent. Dispose of contaminated absorbent, container and unused contents in accordance with local, state and federal regulations.