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PVA HWF-17 may be used as a modifier for plywood in two ways: Pre-addition:1.5 ~ 3 % of the weight of urea of HWF-17 is added during the preparation of resin condensation. Post-addition:3 % of the weight of urea-formaldehyde resin of HWF-17 is added to serve as an extender,which
increases the durability of resin.
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