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High - low - frequency pressure method: the process method for the treatment of wood preservative and flame retardant with constant repetition of atmospheric pressure and pressure cycle is called high - low frequency, which can be used to obtain better corrosion and flame retardant effect than the full cell method. Usually, the depth of the dip of the wood will be deeper. This is a kind of wood preservative and fire retardant effect of better anti-corrosion flame retardant technology, recommended for use.