1970BS EN 351-1:2023 Durability of wood and wood-based products. Preservative-treated solid wood Classification of preservative penetration and retention (British Standard)
2008BS EN 351-1:2008 Durability of wood and wood-based products. Preservative-treated solid wood. Classification of preservative penetration and retention
2008BS EN 351-1:2007 Durability of wood and wood-based products - Preservative-treated solid wood - Part 1: Classification of preservative penetration and retention
1996BS EN 351-1:1996 Durability of wood and wood-based products - Preservative-treated solid wood - Classification of preservative penetration and retention