Meanwhile, raw material prices continued to decline QoQ and YoY. The percentage of cost of sales to revenue decreased from 81.2% in Q1/20 to 70.8% in Q2/20. The decline in raw material prices, which dropped 0.7% QoQ and 9.1% YoY for NR latex, and 7.8% QoQ and 19.4% YoY for NBR latex, and the economy of scale derived from the additional production volume, drove a significant increase in gross profit margin from 18.8% in 1Q/20 to 29.2% in 2Q/20.【อ่านข้อความเต็ม】