Timber Grade Guide
Treatments
H3 Is rated for outside, above-ground use.
H4 Is rated for outside, in-ground use.
LSOP Light Organic Solvent-borne Preservative. LOSP is a solvent-borne preservative treatment of pine timber. The organic solvent takes the preservative into the wood and is drawn out in the last stages of treatment leaving the preservative in the wood. LOSP treated pine has long lasting protection against decay and insect attack. LOSP treated timber is great for appearance applications such as external joinery, due to it leaving the light coloured appearance unchanged after treatment.
ACQ Alkaline Copper Quaternary. ACQ is a water-borne preservative treatment of pine timber. The ACQ treatment process is similar to CCA but is free of arsenic. Instead uses copper and ammonium compounds as agents against insect attack, fungi, termites and wood boring insects. After pine has been treated with ACQ its appearance can range from dark green to brownish green and can be stained or painted once dry.
CCA Copper, Chromium and Arsenic salt. CCA is a water-borne preservative treatment of pine timber. CCA is pressure impregnated into the wood and has a high resistance to chemicals leaching out of the timber over time. This high resistance is due to the chromium which locks in the elements of copper and arsenic into the wood. The arsenic and copper elements protect from insect and fungal attack. Pine which has been treated with CCA is clean, odourless and has a slight green colour.
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