Abstract
As a way to measure the solid content of fire-retardant in treated wood, we suggested to calculate it from the weight change of samples with water leaching. Thin samples of 5 wood species (Sugi, Akamatsu, Karamatsu, Douglas Fir and Western Hemlock) were treated with several concentration impregnant and water leaching test was conducted with these treated samples. It was indicated that the correction against elution from base material wood was needed for Karamatsu samples to derive the solid content of fire-retardant from weight change after the fire-retardant treatment or water leaching operation. The effects of leaching condition and drying temperature were examined, and appropriate leaching conditions were demonstrated. Additionally, we suggested the way to predict the solid content of fire-retardant from density of base wood.
