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Cross Arms Treatment


Our hardwood cross arms are treated at our modern fully automated treatment facility with CCA to H3 level as per Australian Standard AS 1604 for above ground use which provides substantial long term cost savings by significantly extending the service life of the cross arm.

CCA H3 treatment is suitable for above ground use and is resistant to insect and fungal attack.

CCA Treated hardwood cross arms will also outperform equivalent untreated hardwood in environments where moisture, insect activity and fungal attack are a common occurrence. CCA treated hardwood cross arms will most likely have a longer service life than concrete or steel cross arms in locations where corrosive salt and or moisture laden air are present.

The Lifewood® CCA preservative supplied by Koppers Performance Chemicals Australia to DTM Timber is a waterborne, Chromated Copper Arsenate preservative system developed to provide long-term protection to wood exposed in exterior applications and is applied to wood by pressure treatment. The CCA preservative is an effective fungicide and termiticide providing protection from a broad spectrum of decay, fungi and wood boring insects. CCA is one of the most effective wood preservatives available.

DTM Timber’s Tiaro treatment plant conforms to all relevant Australian Standards documents, including the following:

  1. AS/NZS ISO 9001:2008 This is to certify that the hardwood treated from DTM Timber Tiaro is done so using a AS/NZS ISO 9001:2008 Quality Management System, certification No 857, audited and certified by Sci Qual International.
  2. AS 1604-2010 Timber-Preservative Treated-Sawn & Round : This is to certify that the hardwood treated at DTM Timber Tiaro site conforms to AS 1604, and has been subjected to preservative treatment using Copper Chrome Arsenate, CCA to H3 level which is considered suitable for above ground use and is resistant to insect and fungal attack.
  3. AS/NZS 1605 Sampling & Analyzing Timber Preservative Treated Timber. DTM Timber uses a Spectro Phoenix X-ray Fluorescence analyzer supplied, serviced and calibrated by Koppers Inc. Koppers Performance Chemicals Australia is a member of the Timber Preservers Association of Australia.
  4. AS 14001:2004 Environmental Management Systems (certification No 3574), audited and certified by Sci Qual International.

Download MSDS on Lifewood CCA Treated Timber


DTM Timber ensures that all staff are trained in and conform to all Internal DTM Timber policies and procedures including the requirement that all DTM Treatment Plant staff have a minimum qualification of Certificate 3 in Sawmilling, Processing and Timber Treating (FPISW3201B).

DTM Tiaro was the first treatment site in the country to have their entire treatment plant staff complete this qualification.

All treatment plant staff received initial training from experienced DTM trainers as well as external trainers provided by Koppers Performance Chemicals Australia and received final training and were assessed as competent by RTO’s such as Fitec Australia Inc No 5343 and Timber Training Creswick LTD No 4168.

DTM Tiaro has an accredited radiation safety officer as the supervisor of their treatment testing laboratory. Osmose Australia is able to link up to our fully automated computer controlled treatment plant to ensure all systems are functioning correctly.

DTM also has a quad redundant back up record keeping system for all operational and testing records.

DTM Timber is a certified member of Timber Queensland including the Treatment Division and conforms to the guidelines and requirements of the Timber Preservers Association Australian.