一次性饭盒上的编码通常为数字1至7，这些数字被置于一个由三个箭头组成的三角形内，代表塑料的不同材质和特性，具体如下：

　　The codes on disposable lunch boxes are usually numbers 1 to 7, which are placed in a triangle composed of three arrows representing different materials and characteristics of plastic, as follows:

　　数字1（PET，聚对苯二甲酸乙二醇酯）：

　　Number 1 (PET, Polyethylene terephthalate):

　　常见于矿泉水瓶、碳酸饮料瓶等。耐热至70℃，易变形，可能释放对人体有害的物质，使用10个月后可能产生致癌物，不适合用于一次性饭盒。

　　Commonly found in mineral water bottles, carbonated beverage bottles, etc. Heat resistant to 70 ℃, easily deformed, may release harmful substances to the human body, may produce carcinogens after 10 months of use, not suitable for disposable lunch boxes.

　　数字2（HDPE，高密度聚乙烯）：

　　Number 2 (HDPE, high-density polyethylene):

　　常用于制作清洁用品、沐浴产品的包装瓶。可耐110℃高温，标明食品用的塑料袋可用来盛装食品，但一般不用于一次性饭盒。

　　Commonly used for making packaging bottles for cleaning and bathing products. Can withstand high temperatures up to 110 ℃, plastic bags labeled as food can be used to hold food, but are generally not used for disposable lunch boxes.

　　数字3（PVC，聚氯乙烯）：

　　Number 3 (PVC, polyvinyl chloride):

　　常用于制作建材，属于有毒塑料制品。高温时容易释放有害物质，对人体健康有害，已很少用于食品包装。

　　Commonly used in the production of building materials, it belongs to toxic plastic products. It is easy to release harmful substances at high temperatures, which is harmful to human health and is rarely used in food packaging.

　　数字4（LDPE，低密度聚乙烯）：

　　Number 4 (LDPE, low-density polyethylene):

　　常用于制作保鲜膜、塑料膜等。耐热性不强，超过110℃时会出现热熔现象，留下人体无法分解的塑料制剂，不适合用于一次性饭盒。

　　Commonly used for making cling film, plastic film, etc. The heat resistance is not strong, and when it exceeds 110 ℃, it will experience thermal melting, leaving behind plastic preparations that cannot be decomposed by the human body. It is not suitable for use in disposable lunch boxes.

　　数字5（PP，聚丙烯）：

　　Number 5 (PP, polypropylene):

　　是制作一次性饭盒的常见材质。耐高温，可耐130℃，是可以放进微波炉的塑料盒。在清洁后可重复使用，环保性相对较好。

　　It is a common material for making disposable lunch boxes. High temperature resistant, capable of withstanding up to 130 ℃, it is a plastic box that can be placed in a microwave oven. After cleaning, it can be reused and has relatively good environmental friendliness.

　　数字6（PS，聚苯乙烯）：

　　Number 6 (PS, polystyrene):

　　常用于制作碗装泡面盒、快餐盒等。又耐热又抗寒，但不能放进微波炉，以免因温度过高而释出化学物，且不能用于盛装强酸、强碱性物质。

　　Commonly used for making bowl shaped instant noodle boxes, fast food boxes, etc. It is both heat-resistant and cold resistant, but cannot be placed in a microwave oven to prevent the release of chemicals due to high temperatures, and cannot be used to contain strong acids or alkaline substances.

　　数字7（其他类塑料，如PC）：其中可能含有有损健康的双酚A，耐高温但不宜接触食品，不适合用于一次性饭盒。

　　Number 7 (other types of plastics, such as PC): It may contain harmful bisphenol A, is heat-resistant but not suitable for contact with food, and is not suitable for use in disposable lunch boxes.

　　本文由 一次性纸餐盒  友情奉献.更多有关的知识请点击  //www.tenshiro.com/   真诚的态度.为您提供为全面的服务.更多有关的知识我们将会陆续向大家奉献.敬请期待.

　　This article is a friendly contribution from disposable paper lunch boxes For more related knowledge, please click //www.tenshiro.com/ Sincere attitude To provide you with comprehensive services We will gradually contribute more relevant knowledge to everyone Stay tuned