Wood Seal A™ (WSA™) is an application ready, water based fire retardant designed for treatment of raw wood. It is mix of proprietary ingredients, which forms a slight intumescent foam layer and carbon char when the treated wood is exposed to fire. Once the carbon char is formed there will be minimal flame propagation, smoke evolution or afterglow. The product is designed for interior use only.
Wood Seal A™ can be applied via spray, brush, dipping or roll/curtain coater. The product must penetrate the wood and be allowed to thoroughly dry to be effective. The coverage rate is 150 to 350 ft2 per gallon. Wood Seal A™’s Class A rating was achieved on Douglas Fir. Other wood of a similar, or lesser inherent fire spread rating, and penetrability, when properly treated should meet Class A requirements. Excess product should be removed before drying. It is recommended that a small sample of the wood be tested for uptake and penetration prior to application. For use with a dip chamber or any machine application, the excess material should be removed before drying. This product may be used on most types of wood as long as penetration occurs. The product may be stained with a compatible stain or top coat after treatment. However, many stains and top coats are flammable and can adversely affect the flammability of the treated substrate.
FEATURES – TECHNICAL CHARACTERISTICS
- Water based penetrants.
- Colorless, non-staining, inert, and low odor.
- The proprietary active ingredients of this product contribute to flame resistance by: Melting below flaming temperatures and then re-solidifying into a crystalline form of a carbon (char) that acts as a barrier between the paper or paperboard surface and the flame. Forming an intumescent foam barrier when exposed to flame.
ADVANTAGES – PERFORMANCE CHARACTERISTICS
- Aqueous solution containing a blend of proprietary active ingredients.
- No polybrominated diphenyl ethers are in the composition
- Decrease fire and smoke evolution, providing resistance to flameless combustion, referred to as afterglow.
- Properly applied to wood, when exposed to heat and flame, Wood Seal A™ initially form intumescent carbon foam followed by the creation of a carbon char that resists fire, heat, and smoke.
- Free of PDBE’s and Non-Toxic
- Reduces the effect of Heat and Smoke without Flame propagation.
- Easy and Flexible Product Applications
- No Halogen Donor Required
- Contain no halogens
SPECIFIC PRODUCT INFORMATION
Flame Spread = 25
Smoke Generation = 50
Wood Seal A™ and Wood Seal™ are fire retardant penetrants designed for use on unpainted / unsealed wood and other cellulose type materials. Wood Seal A™ is basically a more robust version of Wood Seal™.
TESTING / FLAME SPREAD RATINGS
Both Wood Seal A™ and Wood Seal™ were tested on Douglas Fir in the ASTM E-84-05 (Steiner Tunnel) flame spread test. Wood Seal™ achieved a Class B fire rating, Wood Seal A™ achieved a Class A fire rating
WHAT IS THE DIFFERENCE BETWEEN THE TWO?
Wood Seal™ is a water-based product, containing no other solvents. Wood Seal A™ is also a water-based product with performance additives and alcohol based penetrant additives. As such, Wood Seal A™ should be stirred prior to use – as some settling of the additives may occur. Both Wood Seal A™ and Wood Seal™ are low odor, nontoxic, non hazardous, and contain no halogens. Wood Seal™contains very low VOCs while Wood Seal A™ contains slightly more in the form of alcohol based penetrant aids.
HOW ARE THE PRODUCTS APPLIED?
Wood Seal A™ and Wood Seal are water thin liquids and may be applied by brush, roller, spray and submersion methods to unpainted / untreated wood, paper, or other cellulose products. The substrate must be able to absorb the water based chemical to provide fire protection. A simple guideline test is to place a few drops of water on the material – if the water is readily absorbed – it is probably treatable. Recommended coverage rates range from 150-350 square feet per gallon, depending upon the results desired.
DO THESE PRODUCTS PROTECT THE SUBSTRATE FROM FIRE DAMAGE?
Wood Seal™ is a mild intumescent but will not prevent fire damage to the substrate. It will slow the flame spread and prevent fire from propagating along the treated surface, which also reduces smoke production. Wood Seal A™ is a somewhat more robust intumescent and will protect the substrate somewhat better, but it will still not prevent wood damage from the flame.
CAN / SHOULD THESE PRODUCTS BE TOP COATED?
Both dry clear and odorless. Wood Seal A™ may leave some residue on the surface, especially if heavily applied. Remove with slightly dampened cloth before completely dry or fine sanding, if necessary for staining or fine finishing.
Both may be over-coated with paint or stain once completely dried. A water resistant top coating is recommended for exterior, or high humidity interior use. Be sure and test a small treated area, or sample, for compatibility before going full scale.
Once treated the material should not need to be treated again – unless it is not sealed and is exposed to surface moisture or high humidity for an extended period.
WILL THESE PRODUCTS ACHIEVE THE LISTED RATINGS ON ALL WOODS?
NO. Many factors contribute to the flammability and treatability of different wood varieties – oil and resin content, moisture content, the ability to absorb these water based products, etc… As such, some woods are much harder to treat than others. The official ratings given for these products were from testing on Douglas Fir which is considered the standard for testing. It absorbs liquid fairly well and has an untreated Flame Spread of 90°F to 105°F. Comparison charts of flame spread rating for most wood types are available on the internet. Any flame spread ratings to be met or claimed must be determined by the customer.
NON-CODE ADEQUATE TREATMENT
To test for general adequate treatment – Apply a flame, or torch to a sample of treated material. If the flame does not spread rapidly away from the heat source and goes out soon after the heat source is removed, then your material is probably sufficiently treated. If you are trying to meet code – check with your local fire marshal as to what is acceptable. You may have to pass third party testing.