yongprapat, kamonchai, Nida Chaimoon, and Maneerat Ongwandee. “Utilization of PU Foam Insulation Waste to Air Purifier Filter”. Naresuan University Engineering Journal 16, no. 1 (June 18, 2021): 64–72. Accessed April 30, 2024. https://ph01.tci-thaijo.org/index.php/nuej/article/view/240866.