Plastic bag identification for "toxic plastic bags", the public need not panic, as long as we know some basic knowledge of plastic packaging materials and master some effective identification methods, then we can do how to use plastic bags safely and reasonably.

目前市場上常見的有毒塑料袋一般指的是單膜包裝袋。這類包裝袋的材料中，聚氯乙烯是有毒的（改性聚氯乙烯除外）。所謂“有毒”，是指塑料袋材料本身含有對人體有害的物質，如某些重金屬及其鹽類以及聚合物的單體，其中尤以重金屬鉛和氯乙烯單體對人體為有害（乙烯、丙烯單體是無毒的）。區分包裝材料是否有毒，主要在于將有毒的聚氯乙烯材料區分開來或將加入了有毒再生料的聚乙烯材料區分開。

At present, the common toxic plastic bags on the market generally refer to single film packaging bags. In this kind of packing bag material, PVC is toxic (except modified PVC). The so-called "toxic" refers to that the plastic bag material itself contains substances harmful to human body, such as some heavy metals, salts and monomer of polymers, especially heavy metals, lead and vinyl chloride monomer are harmful to human body (ethylene and propylene monomer are non-toxic). To distinguish whether the packaging materials are toxic or not, it is mainly to distinguish the toxic PVC materials or the polyethylene materials with toxic recycled materials.

“聞”：指充分發揮人的嗅覺功能。如果我們聞到塑料包裝袋有明顯的臭味或異味，那么就得當心其有毒，千萬不可用于裝食品，因為食品級塑料包裝袋是無味、無臭的。

"Smell": refers to the full distribution of the olfactory function of the volatilizer. If we smell the obvious odor or peculiar smell of plastic packaging bags, then we should be careful that they are poisonous and should not be used to pack food, because food grade plastic packaging bags are tasteless and odorless.

“看”：指看顏色和均勻度。未加色料的“超薄型”和“薄型”塑料袋應呈微浮白色且透明，對光觀察，其材料應均勻，無黑點或臟點（塊）；有色“薄型”和“普通型”塑料袋，尤其是深色的（如黑色）因其難以用眼光鑒別，不易用來裝食品。

"Look": refers to look at the color and uniformity. The "ultra thin" and "thin" plastic bags without color additive shall be slightly floating white and transparent, and the materials shall be uniform without black spots or dirty spots (blocks) when observed with light; the colored "thin" and "ordinary" plastic bags, especially the dark ones (such as black) are difficult to be identified with eyes, so they are not easy to be used for food.

燒：指從塑料袋上取一小塊，用火點燃，觀察火焰顏色，并聞其氣味，聚乙烯材料燃燒火焰應該是上端黃、下端藍，且燃燒時滴落，能聞到石臘氣味；而聚氯乙烯材料的燃燒火焰應是上端黃、下端綠，冒白煙，有刺激性難聞氣味。

Burning: take a small piece from the plastic bag, light it with fire, observe the color of the flame and smell it. The flame of polyethylene material should be yellow at the upper end and blue at the lower end, and it drips when burning, and it can smell the smell of paraffin; while the flame of PVC material should be yellow at the upper end and green at the lower end, emitting white smoke, with pungent and unpleasant smell.

測：指測材料的比重。從塑料袋上取一小塊，加熱讓其卷縮再放入水中，如浮于水面，則是聚乙烯材料，若沉于水底，則可能是聚氯乙烯材料或其它非食品級材料。

Measurement: refers to the specific gravity of materials. Take a small piece from the plastic bag, heat it to shrink and put it into the water. If it floats on the water surface, it is polyethylene material. If it sinks on the water bottom, it may be PVC material or other non food grade material.

以上四種方法中“聞”、“燒”、“測”是用于鑒別無毒聚乙烯材料和有毒聚氯乙烯材料；“看”、“燒”用于識別無毒聚乙烯材料中是否加入了再生料（有毒或無毒的）。

Among the above four methods, "smell", "burn" and "test" are used to identify non-toxic polyethylene materials and toxic PVC materials; "look" and "burn" are used to identify whether recycled materials (toxic or non-toxic) are added to non-toxic polyethylene materials.

另外，在此提醒廣大市民，不論什么情況，在食品購回家后，應盡快將食品從塑料袋中取出，以保萬無一失。即使因未鑒別出而使用了有毒的塑料袋，如果回家后能及時從袋中取出，短暫的時間，不會對食品造成很大的危害，因為毒素的轉移既需要與食品充分接觸，也需要時間。同時，在此呼吁各大商場、超市在定購單膜包裝袋時，應選擇正規塑料制品廠家，以保市民的健康。

In addition, the general public is reminded that, in any case, after the food is bought home, the food should be taken out of the plastic bag as soon as possible to ensure that there is no loss. Even if a toxic plastic bag is used because it is not identified, if it can be taken out of the bag in time after going home, it will not cause great harm to the food for a short time, because the transfer of the toxin requires both full contact with the food and time. At the same time, we call on shopping malls and supermarkets to choose regular plastic products manufacturers when ordering single film packaging bags, so as to protect the health of the public.