有些塑料基本上是由合成树脂所组成，不含或少含添加剂，如有机玻璃、聚苯乙烯等。
Some plastic is essentially composed of synthetic resin, non-or less containing additives, such as acrylic, polystyrene and so on.
产品描述：万瑞al系列抗酸蚀刻油墨是由特殊合成树脂及添加剂配合而成的UV干燥型油墨。
Description: Vinnt al series acid-resistant inks are UV curing inks made by special synthetic resins and additives.
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