Abstract
Low permeability in wood can cause limited retention and penetration of preservative which ultimately affects the wood performance in the field. In the present study, Malaysian red, yellow and white meranti of the Shorea group were selected for evaluation of treatability using commercial copper–chrome–arsenate and ZiBOC – a new preservative system, by the vacuum pressure method at two pressure levels in unsealed and end sealed specimens. A significant difference (P<0·05) in retention levels of both the preservatives was observed in sapwood, heartwood and pith zones. White meranti exhibited treatability class ‘a’ while mottled penetration was observed in red and yellow meranti exhibiting class ‘c’. The spot test for boron, zinc and copper in unsealed and end sealed specimens revealed that longitudinal penetration was not the dominant flow in red and yellow meranti.
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