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Conservation of Nypa fruticans and Indigenous Timber Species of Sundarban Mangrove Forest of Bangladesh by Using Preservative Treatment.
2005 - IRG/WP 05-40297
This report describes the possibilities and benefits of preservative treatment of some Bangladeshi wood species. It is concluded that: Heartwood of Sundri is not easily treatable. The treating schedule of 14.1 kg/cm² pressure and eight hours treatment period may be used for treating sundry logs. During the treatment of Sundri wood must not mix with other species. Other timber species such as Gewa, Keora, Baen, Goran etc are easily treatable by full cell pressure method using schedule of four to six hours treatment period and 14.1 kg/cm² pressure. All the timber species must be sufficiently dry up before preservative treatment. Moisture content should be less than 20% in 1.5 inch (37-38 mm) depth from wood surface. Treatment schedule may vary depending up on size of wood and purpose of use. Pressure treatment of Golpata is very easy, it may treat by dipping technique using schedule of over eight hours with more than 5% CCB preservatives.
G N M Ilias

Protection of a low-density mangrove timber species gewa (Excoecaria agallocha) through preparation of particleboard – An Assessment
2006 - IRG/WP 06-40348
It is now well established that the conversion of low-density and low-cost timbers into laminated, composite and densified form is an alternative of wood protection by means of wood preservatives. Once only the timber species gewa (Excoecaria agallocha) was used for manufacturing newsprint paper in Bangladesh, which is not continued today. The feasibility of commercial production of particleboard from gewa as an alternate raw material was evaluated for its physical and mechanical properties as compared with those of mixed wood particleboard i.e. mixture of pitali (Trewia nudiflora), kadam (Anthocephalus chinensis) and chatian (Alstonia scholaris). It was found that density of gewa particleboard is 628 kg/m3 and mixed wood particleboard is 617.87 kg/m3. The MOR of gewa particleboard is 158.4 kg/cm2 and mixed wood particleboard 204.2 is kg/cm2. The MOE of gewa particleboard is 18611.1 kg/cm2 and mixed wood particleboard is 26,020.5 kg/cm2. The screw holding capacity at edge was higher in gewa than mixed wood (98.2 kg Vs 89.1 kg) and also at face it is higher in gewa than mixed wood (117.3 kg Vs 72.4 kg). The moisture content after curing was lower in gewa particleboard than that of presently used wood particleboard (7.37% Vs 8.20%). Swelling percentage was lower in gewa particleboard than mixed wood particleboard after both 2 and 24 hours soaking in all directions. The similar trend was also found for water absorption after 2 and 24 hours. The assessment revealed that the particleboard of gewa is superior to those of existing mixed wood species. Hence the gewa is an alternative species for indirect protection of other rarely available timbers used for particleboard in Bangladesh.
A A Mahfuz, M O Hannan, M A Islam, M N Islam , M M Islam, A K Lahiry