The common Malaysian Name for the timber of Shorea siamensis (Dipterocarpaceae). Vernacular name applied appears to be uniform throughout the country in that temak batu is used throughout. This is a monospecific timber. The sapwood is lighter in colour and is only moderately sharply differentiated from the heartwood, which is brown with a purple-red tinge.
Also known as Reang and Reang phnom (Cambodia); Mai harig and Phao (Laos); Ingyin (Myanmar); Rang (Thailand); and Ca chac xanh (Vietnam).
The timber is hard to very hard and very heavy with a density of 975-1,090 kg/m3 air dry.
The timber is naturally durable.
It should be very difficult to treat with preservatives.
Texture is fine and even, with interlocked or sometimes wavy grain.
The timber has not been tested at the Forest Research Institute Malaysia (FRIM), but work done in Myanmar and India indicates that the timber is strong, although not as strong as chengal or balau.
The timber is reported to work with some difficulties but the planed surface is smooth.
The timber is reputed to season slowly but with no real degrade.
The trees are normally gnarled and twisted and therefore, large sections or long lengths of this timber may not be available. If available, the timber is suitable for all forms of heavy construction, bridges, piles, railway sleepers and posts.
Wong, T. M. 1982. A Dictionary of Malaysian Timbers. Revised by Lim, S. C. & Chung, R. C. K. Malayan Forest Records No. 30. Forest Research Institute Malaysia, Kuala Lumpur. 201 pp.