Dip diffusion treatment of ten wood species from Irian Jaya.
Samples [5×10×405, 5×10×200 and 5×5×10 cm] of each of 10 Indonesian species of m.c. varying from 60.5 to 151.6% (depending on the species) were treated with 30% BFCA preservative (a mixture of boron, fluorine, arsenic and chromium compounds) by dip diffusion for a storage phase [treatment period] of 4 or 8 wk. Data are tabulated on the specific gravity, and strength and durability classes, of each species, with measurements of retention and penetration of the preservative for each. The results are considered in relation to the requirements for wood use under cover and outdoors without soil contact. Two species, raja (Pterygota forbesii) and sehiega (Celtis latifolia), were treated sufficiently well for both projected uses. Only one species (sehye, Sterculia macrophylla) did not retain sufficient preservative for either use. The other 7 species fulfilled the requirements for use under cover: wafut, Cananga odorata; starka, Octomeles sumatrana; senai, Dracontomelon mangiferum; sutiet, Spondias cytherea; bemoe, Canarium indicum; susu, Alstonia scholaris; and bimiek, Pterocymbium beccarii. Treatment periods were 8 wk for bemoe, raja and sehiega, and 4 wk for the other species. During the treatment period severe bluestain was observed on 7 species, while the other 3 (senai, sehiega and bimiek) were not so affected; the addition of an anti-bluestain compound to the preservative is recommended. [With English tables.]