Plywood and OSB (oriented strand board) structural panels are real wood. a natural insulator. and thus provide good protection against heat loss and condensation. Large panel size also minimizes the number of joints that can "leak'' heat, airborne noise or flames. Tests conducted in 1974 by Underwriters Laboratories showed flame-spread. ratings from 75 to 200 for common plywood grades.
Variables in the U.L. tests included species group. glue type, thickness and surface texture. All plywood tested exhibited a flame spread of 200 or less. A decrease in flame spread with increasing panel thickness noted for thicknesses from 1/4 to 5/8 inch.
Fire Rated Plywood is pressure-impregnated, third generation, interior fire-retardant treated lumber. and plywood for enclosed structural applications. has been strength-tested after prolonged exposure to elevated temperatures. and moisture to verify its strength characteristics. when used in roof systems and other recommended applications.
Plywood can also be fireproof with fireplace-resistant coatings and other finishes. Via the use of sure chemicals to react at excessive temperatures. those finishes create an infinite variety of small insulating air baggage. a phenomenon known as "inflation."
The check showed that the flame unfold stage of coatings turned into as low as 10. and the flame spread degree of one coating turned into as little as 15 to 20. These paints are generally not familiar by means of fireplace code government. because the rate of utility and the degree of upkeep is hard to assure.
Fireproof plywood is the common name of the fire retardant plywood. is by the fire resistant wood section rotary cut into veneer or cut into thin wood by the wood square plane. after the veneer treated with flame retardant. and then used adhesive to cement and form thr ee layers or many layers of resistant plywood material. usually with odd plywood roof veneer. and make the adjacent layer veneer fiber direction perpendicular glued.
This plywood can painted or stained as untreated wood. but flammability of the finish should considered. FlamePro plywood is in intended for interior use only. and should protected against direct moisture, precipitation or regular condensation. FlamePro plywood is low-corrosivity and low-hygroscopicity.
FlamePro plywood has low VOC’s or Formaldehyde. Galvanized steel hardware recommended. although the treatment does not increase the corrosion of bare steel. Ripping or cross-cutting plywood, drilling holes and light sanding is permissible. It is not necessary to field-treat cut ends to maintain the flames spread rating.
Plywood and OSB (oriented strand board) structural panels are real wood, a natural insulator, and therefore provide good protection against heat loss and condensation. Large panel size also minimizes the number of joints that can "leak'' heat, airborne noise or flames. Tests conducted in 1974 by Underwriters Laboratories showed flame-spread ratings from 75 to 200 for common plywood grades. Variables in the U.L. tests included species group, glue type, thickness and surface texture. All plywood tested exhibited a flame spread of 200 or less. A decrease in flame spread with increasing panel thickness was noted for thicknesses from 1/4 to 5/8 inch.
Flame spread of the interior finish is a concept that relates to the rate at which a flame will spread along the surface of a material. The best known flame-spread test is the "tunnel test" which has been adopted as ASTM test Standard E-84.
The various regional and city building-code bodies have adopted flame-spread limitations for interior finish material based on recognized laboratory test methods. Flame-spread ratings for various materials are given in the table below.
The lowest flame-spread rate (0 to 25) is permitted for areas where fire hazard is most severe, as in vertical exitways of unsprinklered buildings used for public assembly. Materials which rate 26 to 75 are permitted in areas of intermediate severity, such as corridors providing exitways in commercial and industrial structures. Materials rated from 76 to 200 are permitted in rooms of most occupancies except hospital rooms and the like.
Tests conducted in 1974 by Underwriters Laboratories showed flame-spread ratings from 75 to 200 for common plywood grades. Variables in the UL tests included species group, glue type, thickness and surface texture. All plywood tested exhibited a flame spread of 200 or less. A decrease in flame spread with increasing panel thickness was noted for thicknesses from 1/4 to 5/8 inch. Exterior stains appeared to contribute about 30 to 50 points to the flame spread, but latex-base finish added no points.
One relatively simple way to ensure low flame-spread ratings would be to specify APA "303 Siding" panels. These 303 Siding panels yielded values from 95 to 120, even for the minimum thickness allowed in this category. 303 Siding Texture 1-11 pattern also rated 95. These values are valid for 303 panels which are unfinished, rough sawn, rough sawn and channel groove, or with brushed surface texture
Smoke developed by plywood panels was quite low. In the UL tests, average smoke-developed values ranged from 25 to 130. Except for the average of one all-southern pine and one all-cedar test which only went to 130, none of the smoke-developed values exceeded 100, and the average of all 45 tests was 65.
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Yueshan fire resistant treated wood plywood refers to plywood . that impregnated with a retardant fire treated chemical substance solution. This process uses a vacuum pressure chamber to force permeate into. the fiber of the resistant plywood. offering constant fire flame spread protection.
Yueshan Fire Retardant product fulfills certain requirements of Euro-class B. Usually. Our customer prefer to choose 16mm thickness 4ft x 8ft fireproof plywood. because of treated lumber is ideal for fireretardant pressureimpregnated interior applications. in public areas buildings,mall, office, school, hotel. and other applications that need safe and adequate protection in case of a fire.
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