<1> is resistant to chemical corrosion

< 2 > is glossy, partially transparent or translucent

< 3 > is mostly good insulator

< 4 > is light and strong in weight

< 5 > processing can be easily mass production, low price

< 6 > is versatile, versatile, easy to colour and partly high temperature resistant

<7> storage of goods can have the effect of moisture-proof