Facts & Resources 
 Timber Treatment Brands 

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AS1604.1 Preservative-treated wood-based products Part 1: Products and treatment requires that preservative-treated timber is marked with an alphanumeric code to identify the following minimum information:

• A treatment plant number indicating the place of manufacture.

• A preservative code number (listed in Appendix C, AS1604.1)

• A hazard class number (described in Section 1 of AS1604.1)

• A hazard suffix code

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XXX  is a 3 digit numerical code indicating the company and treatment plant number (see Table 1)

XX    is a 2 digit numerical code indicating preservative number (see Table 2)

HX    is an alphanumerical code indicating the hazard appropriate to the preservative level (see Table 3)

X      is an alphabetic suffix indicating penetration, preservative or utilization restrictions. (see Table 4)

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Other information may be marked on preservative-treated timber including,

• the Australian Standard relating to preservative treated timber . i.e. “AS1604.1”

• the name of the Company which manufactured the product

• the date/time of a preservative treatment

• production batch number or product numbers

• for CCA treated timber only, the words “treated with copper chrome arsenate”. This is a regulatory requirement of the APVMA

• information about any geographic limitations. E.g. Use only south of Tropic of Capricorn

• information relating to other product characteristics. E.g. stress grade, moisture content
   

Treatment plant numbers were assigned to individual treatment plants for many years by the NSW State Government. However this service was discontinued in 2013. Timber Queensland have provided a list below of TQ members and their respective treatment plant numbers. This will assist Queensland timber users to identify preservative treated timber products from Timber Queensland treatment manufacturer members.
 

Table 1. Treatment Company/Plant Numbers

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   *Hyne Timber also adopt Codemark certification, with corresponding labelling or identification including the
    certificate number (CM70001, CM70002, CM70003, CM40200) for each product.

Table 2. Preservative Code Number​

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Table 3. Hazard Level Number

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​Table 4. Hazard Suffix

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For further information, refer to AS1604 1 Preservative-treated wood-based products Part 1: Products and treatment.