In this study, the distribution of borates and boron content in disodium octaborate tetrahydrate–treated Radiata pine specimens was investigated. Specimens conditioned to either 12% or 40% moisture content were treated with 15% either glycol- or water-based disodium octaborate tetrahydrate (Na₂B₈O₁₃·4H₂O) and then conditioned at high relative humidity (>90%) for varying durations for 1, 2, 3, and 4 weeks. The study also examined the impact of glue lines on borate distribution and content. Bor