Revised Wood Packing material(WPM) Regulation From now on, MHC Industrial Supply Co obey the regulations on wood packaging material required by USDA, all wood packing material will have the approved treatments: 1) heat treatment to a minimum wood core temperature of 56ºC for a minimum of 30 minutes or 2) fumigation with methyl bromide. To certify treatment, the wood packing material (WPM) will be marked with the following International Plant Protection Convention (IPPC) logo. Also, according to this regulation, paper certificates of treatment will no longer be required.

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