New Penetrating Barrier Treatment for Wood and Wood Composites

摘要

A new treating system has been developed for protecting wood and wood-based composites from biological organisms including decay, mold and termites. The system is surface-applied but rapidly penetrates to the core of most lumber and wood composites including LVL and OSB. The treating solution is mixed on-site in a fully contained module and is applied by dip or in-line spray. Formulations can be customized to provide desired levels of protection. Unlike a pressure treating plant, the mixing and application equipment can be installed at the end of a planer or a panel manufacturing line. It can be easily taken off-line when not in use. The capital cost is generally less than that for a pressure treating plant. Penetrating Barrier preservative systemshave been in commercial use in New Zealand for over two years. They are utilized in a number of mills to protect framing timber from decay and mold. The treatment meets New Zealand Specification 3640 for Hazard Class H1.2 and is being certified for use in Class H3.1. In the U.S., a major siding manufacturer is using a Penetrating Barrier treatment system to provide UC 3A decay and termite protection to its siding products. Additionally, the system has completed a successful plant trial at a U.S. OSB manufacturing facility. Treated OSB was shown in independent testing to be resistant to decay, mold, and Formosan termites, and it successfully passed an ASTM E84-05 flame spread test with a Class B rating. Mechanical properties and appearance of the OSB were not negatively affected by the treatment. Results of the OSB trial are presented in this report.