2.4. Analysis of ash and silica content
As the ash content of rice straw is approximately 13%, higher than that of other plant’s: wheat straw is 4%, bagasse is 2% and bamboo is 1% (Rabemanolontsoa and Saka, 2013), ash and silica content were determined for whole powder, leaf blade powder, leaf sheath powder and stem powder to examine the effect on the properties of binderless board. To determine ash content, samples were combusted at 700 ◦ C for 3 h (Iiyama et al., 1994). Silica content was determined gravimetrically after boiling the ash in 1 M HCl for 30 min. The silica remained as an insoluble residue.

2.4. Analysis of ash and silica contentAs the ash content of rice straw is approximately 13%, higher than that of other plant’s: wheat straw is 4%, bagasse is 2% and bamboo is 1% (Rabemanolontsoa and Saka, 2013), ash and silica content were determined for whole powder, leaf blade powder, leaf sheath powder and stem powder to examine the effect on the properties of binderless board. To determine ash content, samples were combusted at 700 ◦ C for 3 h (Iiyama et al., 1994). Silica content was determined gravimetrically after boiling the ash in 1 M HCl for 30 min. The silica remained as an insoluble residue.
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