How to distinguish PET from other plastics? How is it different from PE, PVC, PP, etc?

聚氯乙烯（PVC）外观：透明至不透明、质硬。软化或熔融温度范围：75~90°C；燃烧火焰状态：上黄下绿有白烟和有刺激性酸味；离火后情况：离火熄灭。

Appearance of polyvinyl chloride (PVC): transparent to opaque, hard. Softening or melting temperature range: 75~90 ° C; Combustion flame state: yellow and green with white smoke and pungent sour taste; After leaving the fire: the fire is extinguished.

聚丙烯和聚乙烯（PP和PE）外观：半透明至不透明，质地透明薄膜。燃烧性：在火焰中可燃。离开火焰后缓缓熄灭或继续燃烧。燃烧时火焰上端呈黄色，下端呈蓝色；有融熔、滴落现象。可闻到石蜡味。

Appearance of polypropylene and polyethylene (PP and PE): translucent to opaque, transparent film. Flammability: flammable in flame. After leaving the flame, slowly extinguish or continue to burn. When burning, the upper end of the flame is yellow and the lower end is blue; There is melting and dripping. You can smell paraffin.

聚酯树脂（PET）外观：透明。燃烧性：易燃、离开火焰继续燃烧。近焰即熔缩，熔燃，离开火焰能续燃，少数有烟，有极弱的甜味，灰烬硬圆，呈黑或淡褐色。

Appearance of polyester resin (PET): transparent. Flammability: flammable, continue to burn without flame. Near the flame, it will melt and burn. It can continue to burn after leaving the flame. A few of them have smoke and a very weak sweet taste. The ash is hard and round, black or light brown.

PVC聚氯乙烯“3号”PVC常用于：常见雨衣、建材、塑料膜、塑料盒等。很少用于食品包装。使用：这种材质可塑性优良，价钱便宜，故使用很普遍。只能耐热80 ℃，高温时容易产生有害物质，甚至连制造的过程中都会释放有毒物。若随食物进入人体，可能引起乳癌、新生儿先天缺陷等疾病。这种材料的容器已经较少用于包装食品。如果使用，千万不要让它受热。难清洗易残留，不要循环使用。若装饮品不要购买。

PVC PVC "No. 3" PVC is commonly used in: common raincoats, building materials, plastic films, plastic boxes, etc. It is rarely used for food packaging. Use: This material has good plasticity and low price, so it is widely used. It can only heat up to 80 ℃. It is easy to produce harmful substances at high temperatures, and even toxic substances will be released during the manufacturing process. If it enters the human body with food, it may cause breast cancer, neonatal congenital defects and other diseases. Containers of this material have been less used for packaging food. If used, do not let it be heated. It is difficult to clean and easy to remain. Do not recycle. Don't buy drinks.

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