The durability of a fire-retardant treatment of wood under exposure to accelerated weathering is covered by this standard. It is intended for fire-retardant treatment of wood by pressure impregnation, rather than simply by surface coating.
This test method prescribes the procedure for determining the equilibrium moisture content of fire-retardant treated (FRT) wood and wood-based product samples after exposure to a standard high relative humidity condition of 90 ± 3% at 27 ± 2°C.
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