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Fire-retardant materials should not be confused with fire-resistant materials. A fire resistant material is one which is designed to resist burning and withstand heat. An example of a fire-resistant material is one which is used in bunker gear worn by firefighters to protect them from the flames of a burning building.
The article also cites the fire-retardant character of the flitch beam, "in case of a fire would not probably affect the iron until the wooden beams were badly burned." [3] With the advent of high-strength engineered lumber, the advantages of flitch-beams disappeared. For example, comparing the capacity of 2 beams spanning 18 feet:
The result is a product the company calls "Glass Wood," which they claim is Class A fire-retardant, chemically inert, rot and decay resistant, and superior in strength to untreated wood. [19] Timbersil is currently involved in litigation over its claims.
A fire retardant is a substance that is used to slow down or stop the spread of fire or reduce its intensity. This is commonly accomplished by chemical reactions that reduce the flammability of fuels or delay their combustion .
Other types of plywoods include fire-retardant, moisture-resistant, wire mesh, sign-grade, and pressure-treated. However, the plywood may be treated with various chemicals to improve the plywood's fireproofing. Each of these products is designed to fill a need in industry. Baltic Birch plywood is a product of an area around the Baltic Sea.
Non-hazardous. Not restricted by depth of application. Fire resistant – flame spread 5, smoke spread 0 (ASTM-E-84) – will not smoke at all upon direct contact with flame and is a two-hour firewall at a 3.5 in (89 mm), or normal 2 in × 4 in (51 mm × 102 mm) stud wall, application per ASTM E-199.
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