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VACUUM-PRESSURE IMPREGNATION
Lumber, plywood or timber is loaded into a treatment cylinder, and a vacuum is applied. During this stage, most of the moisture and air is removed from the wood cells. The vacuum in the cylinder causes the cylinder to fill with FLAME SAFE's proprietary fire retardant. Pressure is raised in the cylinder forcing the fire retarding solution into the wood. The pressure and time varies depending on the species of the wood, the commodity being treated, the cross-sectional area, and the amount of the fire retarding solution to be impregnated into the wood. The pressure in the cylinder forces the remaining solution to flow back into a holding tank. Another vacuum is applied, removing the excess solution from the wood. The product is loaded onto trams that service a gas fired forced air kiln. |
