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
Azole Neo-nicotinoid
Compound Wood
Preservatives
AZN
Oil-type Wood Preservative Creosote Oil Wood
Preservative
A