Dillenia spp. (Family: Dilleniaceae)
Medium Hardwood. Major species include D. borneensis, D. excelsa, D. grandifolia, D. pulchella and D. reticulata. Also known as Poplea and San (Cambodia); Kukulava and Kulava (Fiji); Dillenia (India); Kendikara and Simpur jangkang (Indonesia); Phao and San kham (Laos); Mai-masan, Thabyu and Zinbyum (Myanmar); Dillenia and Majongga (Papua New Guinea); Katmon and Katmon-layugan (Philippines); Kapuchu and Mudi (Soloman Islands); Godapura (Sri Lanka); and Masan, San, San-Na and Tamasi (Thailand).
- Density: 675-820 kg/m3
- Heartwood: red-brown, sometimes with a purplish tinge and darkens on exposure
- Sapwood: lighter in colour and merges gradually into the heartwood
- not durable
- texture is coarse and uneven, with straight to shallowly interlocked grain
- nailing property is rated as poor
- Freshly felled logs are usually sound except for some heart shakes. The logs are liable to split badly soon after felling, frequently throughout the whole length of the logs. Sawn material of simpoh is prone to spring badly. Other degrades of the timber such as warping and twisting are common during seasoning. Some specimens of simpoh were found to be attacked by powder-post beetles.
The timber has an attractive silver figure and is suitable for decorative works, plywood, interior finishing, panelling, mouldings, joinery, cabinet making, flooring, furniture and ornamental items. It is also suitable for posts, beams, joists, door and window frames and sills, railway sleepers, staircase (tread, stringer, apron lining, carriage, newel and riser), vehicle bodies (planking), ship and boat building (general planking), piling, columns (light duty), cooling tower (non-structural members) as well as telegraphic and power transmission posts and cross arms.