BFs were sourced from South Samoeng, Chiang Mai, Thailand. The EP resin (Part A), grade A 0302, and hardener (Part B), grade A 0301, were purchased from Easy Resin, Co., Ltd., Nonthaburi, Thailand. Sodium hydroxide (NaOH) and sodium chlorite (NaClO2) were obtained from Merck & Co., Inc., Darmstadt, Germany.
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