SIFAT KEAWETAN ALAMI, PENCUACAAN (WEATHERING), DAN EFEKTIFITAS BAHAN PENGAWET BORON PADA KAYU JATI HUTAN RAKYAT

Abstract

Nowadays, teak wood including young teak from community forest has been getting more widely utilized. Public opinion showed that teak wood from community forests possess low quality and less durable because of its early harvesting. Study on the natural durability of young teak on the various fields is necessary. However, there is a lack of information on the natural durability of teak wood from community forest to prove the public opinion. This study was divided into 3 parts, i.e. the natural durability, weathering, and preservation effort of teak wood from community forest. By considering the position of wood on the axial direction of tree and sapwood-heartwood, the natural durability of teak wood was determined by graveyard test for 6 months on two locations. The weathering test of teak wood as mentioned on previous part was conducting according to Johnson Method for 6 months by observing color and chemical changing based on CIA L*a*b* system and Fourier Transfer Infrared Spectroscopy (FTIR) analysis, respectively. Meanwhile, in order to improve the durability, sapwood was treated with various boron concentrations by a bethel process and then followed by graveyard test for 6 months. This study used completely randomized design. Data were analyzed by variance analysis and followed by Tukey�s test. The durability of teak wood from community forest was influenced by heartwood-sapwood and the environmental conditions of graveyard test locations where the wood applied. However, the teak wood durability was not influenced by the position of wood on the axial direction. Teak wood from the bottom and upper part of log showed no different in the natural durability. Both heartwood and sapwood were attacked by subterranean termites in a month. Teak heartwood from community forest could be classified in II durability class and sapwood was III-IV durability class. Both heartwood and sapwood surfaces showed discoloration with �Eab 15.6 and 19.34, respectively, after weathering. Wood surface experienced discoloration on both sapwood and heartwood, the value were 15.60 and 19.34 respectively. After all, the color of teak wood become grey and dull due to the photodegradation of lignin according to FTIR analysis. The weathering also decreased the lightness (L*), redness (a*), and yellowness (b*) of heartwood and sapwood, 50.54 and 49.4