Natural Rubber STR 5L (Standard Thai Rubber, 5L) was manufactured by Yala Latex Industry Co., Ltd., Yala, Thailand.
Layered silicates used in this study were pristine sodium montmorillonite (Na-MMT) with cation-exchange capacity (CEC) of 110 meq/100 g. It was kindly supplied by Volclay Siam Co., Ltd., Rayong, Thailand.