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Preservative treatment of Golpata (Nypa fruticans) using CCA (Chromated Copper Boric Acid)
1999 - IRG/WP 99-40131
Golpata (Nypa fruticans) leaves provide a cheap but practical source of roof thatches. This study was carried out to determine whether the life span of Golpata could be extended by using CCB (Chromated Copper Boric Acid) treatment. Both leaves and midribs of Golpata , with different moisture contents ranging 16.63% to 70.67%, at the start of the experiment were treated with four different concentrations of CCB for 2, 4, 6 and 8 hours by dipping method. The treated samples were analyzed for chemical penetration and retention. Penetration was measured with a copper and boron indicator whilst retention was determined by X-ray spectroscopy. Results showed that moisture content had no significant effect for treating Golpata, but both chemical concentration and duration of dipping period have considerable effect on the preservation of Golpata. Better retention was exhibited by 6 hours of dipping time. Statistical analysis showed at 5% level of significance (confidence) that the effect of treatment times were also significant. Chemical concentration shows a significant effect on penetration of Golpata leaves but concentration has no effect on the retention. At 1% level of confidence, it is seen that the effect of chemical concentration, moisture content and their interaction on the penetration is not significant. For midribs it was found that the treatment time, different moisture content, chemical concentration and their interaction had no statistically significant effect at 1% confidence level on the increase of retention.
G N M Ilias, F Abdullah, M O Hannan, S M Feroz


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