Japan Wood Protection Association

Wood Preservation in Japan

Production of treated wood by commodities, 1995 to 2005

Approximately 75% of treated wood has been used for building materials of house (ground sill and ground sill plate + other building materials). As such, the total production of treated wood per year has closely correlated to the total number of housing constructions in Japan.

Production of treated wood by preservative type, 1994 to 2005

Due to the amendment of the water pollution prevention act of 1997 by the government of Japan, many companies halted the production of CCA-treated wood. Instead, these companies shifted its production to treated wood with water-borne copper based preservatives (CUAZ and ACQ) and water-borne non-copper based preservatives (BAAC, AAC).

Treated commodities by preservative type, 2005

Most of commodities for building materials were treated with water-borne preservatives (copper based (CUAZ, ACQ) and non-copper based (BAAC, AAC)). For exterior use, both copper based and non-copper based water-borne preservatives were used in addition to creosote oil. Almost all crossties were treated with creosote oil.

Wood Preservatives Registered by JIS K 1570 (2004) for Pressure Treatment

Category	Types	Abbreviation
Water-borne Wood Preservatives	Quat Alkyl Ammonium Compound Wood Preservatives	No.1 AAC-1 No.2 AAC-2
	Ammoniacal Copper Quat Wood Preservatives	NO.1 ACQ-1 NO.2 ACQ-2
	Copper Azole Wood Preservatives	No.1 CUAZ-1 No.2 CUAZ-2 No.3 CUAZ-3
	Boron Quat Wood Preservative	BAAC
	Quat non-ester Pyrethroid Compound Preservative	SAAC
	Azole Quat non-ester Pyrethroid Compound Preservative	AZAAC
Emulsion Type Wood Preservative	Fatty Acid Metal Soap Wood Preservatives	NO.1 NCU-E NO.2 NZN-E NO.3 VZN-E
Oil-soluble Wood Preservatives	Naphthenic Acid Metal Soap Wood Preservatives	No.1 NCU-O No.2 NZN-O
Oil-soluble Wood Preservatives	Azole Neo-nicotinoid Compound Wood Preservatives	AZN
Oil-type Wood Preservative	Creosote Oil Wood Preservative	A

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