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

Burn Barrier 133A

Burn Barrier #133A Class “B” Water Base Varnish

Burn Barrier No. 133A is a water base, fire retardant polyurethane varnish, with a semi-gloss sheen. It is designated for use on all new or previously coated wood surfaces (except floors). The varnish will not leach or turn white on aging or washing.

Recommended Uses: Stir material well before using.

For application to all wood surfaces, where a reduction of surface burning characteristics is required to comply with building code requirements.

Performance Information:


Class “B” fire rated on wood when applied in two coats at 450 sq.ft./gallon. Dries by water evaporation.
Does not leach on exposure to high humidity or water. No fire hazard during application or drying. The coating is somewhat thermoplastic. Precaution must be taken when two coated surfaces are touching each other, to prevent sticking and blocking.



Spreading Rate1st. coat, 450 sq.ft./gl.
2nd. coat, 450 sq.ft./gl.
[Aggregate (total) coverage: 356 sq. ft./gl.]
Volume Solids30%
Weight Solids35%
Wet Film Thickness Per Coat3.6 mil
Dry Film Thickness Per Coat1.1 mil
Application Temperature (Surface & air)60F minimum
Drying time @ 77F & 50% RH

To touch 15 to 30 minutes

Top coat 30 minutes

Handle 60 minutes

Type of CureWater Evaporation & coalescence
Flash PointNone to boiling
VOC0.20 lbs./gl. (24 g/L)
2nd. coat, 450 sq.ft./gl.
Shelf Life12 months (unopened)
Weight per gallon8.95 lbs.
Shipping per gallon (4 gallons)40 lbs.
Shipping per gallon (5 gallons)48 lbs.
ApplicationBrush, foam brush, conventional or airless spray.


Surface Preparation:
Surface preparation should be carried out according to good painting practices. All dirt, grease, oil, wax, rust, and other foreign matter must be removed. May be applied to previously coated surfaces in good condition. Glossy surfaces must be dulled with sandpaper or steel wool. All sanding, filling of nail holes, etc. must be completed prior to the application of No. 133A.


Fire Hazard Classification:
Flame spread rating Class “B” when applied to wood surfaces. When tested in accordance with ASTM E-84 (NFPA 255, ANSI/UL 723 and UBC 8-1), the coating obtained the following fire hazard classification;


Coating System Details
Sealer – None
Base Coat No. 133A Applied at
450 sq.ft/U.S. gl. (11.0 m /L)
Top Coat No. 133A applied at
450 sq.ft./US gl. (11.0 m /L)

(When Applied to Douglas Fir)

Flame SpreadSmoke Developed


Packaging: Standard packaging, 1 gallon, 5 gallon pails.


CAUTION! Do not take internally. Close container after each use.


KEEP OUT OF REACH OF CHILDREN. Protect from freezing