ABSTRACT.BThisBstudyBaimsBtoBdetermineBthe optimal drying time of rubber wood (Hevea brasiliensis) related to preservation by the method of hot and cold immersion using boric acid material so as to prolong the use of wood and also reduce costs and canBbeBusedBasBa referenceBinBresearch.BThe parameters tested in the preservation of wood are theoretical absorption and retention values. The optimal drying time of rubber wood (Hevea brasiliensis) for the preservation process of the absorption value and theoretical retention by the method of hot and cold immersion using boric acid material is at 2 weeks drying time. Factors that influence the absorption and retention are caused by water content and length of immertion.

Keywords: Wood preservation, Hevea brasiliensis, boric acid