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What are the materials for fresh-keeping bags?

Jul 16,2025

What are the materials for fresh-keeping bags? 

The first type is polyethylene, abbreviated as PE. This material is mainly used for food packaging. This kind of film for fruits and vegetables that we usually buy back, including semi-finished products purchased from supermarkets, is made of this material. 

 

The second type is polyvinyl chloride, abbreviated as PVC. This material can also be used for food packaging, but it has a certain impact on human safety.  

 

The third type is polyvinylidene chloride (PVDC), mainly used for packaging some cooked food, ham and other products.  

 

Among the three types of plastic wrap, PE and PVDC plastic wrap are safe for human use and can be used with confidence, while PVC plastic wrap contains carcinogens and is extremely harmful to human health. Therefore, when choosing plastic wrap, PE plastic wrap should be chosen.  

 

From a physical perspective, cling film has moderate oxygen and moisture permeability, which can regulate the oxygen and moisture content around the preserved products, block dust in the air, and extend the shelf life of food. Therefore, it is necessary to choose different cling films for different foods.  

 

How to choose a fresh-keeping bag

When choosing a fresh-keeping bag, pay attention to the following points:

1. Pay attention to the material of product labels: Polyethylene bags (PE) are now widely used in food packaging; Polypropylene bags (PP) have high transparency and are mainly used for packaging bread and snacks. Polyvinyl chloride bags (PVC) can also be used for packaging perishable foods such as vegetables and fruits, but cannot be used for packaging oily foods or microwave heating.

 

When heating food in a microwave, use "microwave specific" fresh-keeping bags (such as Miaojie and Xubaoxian).  

 

3. Refrigerators should use fresh-keeping bags instead of ordinary plastic bags to store frozen food. The special process and raw materials of fresh-keeping bags or films have good breathability and preservation performance, while ordinary plastic bags will rot and spoil food after a little longer use, which cannot achieve the purpose of preservation.  

 

4. It is recommended to use colorless and transparent fresh-keeping bags.  

 

The fresh-keeping box can store different types of food and has a certain degree of sealing. They are very convenient and practical, making them one of the popular household appliances in many households. Generally, plastic boxes are more common and can be stored in the refrigerator for refrigeration. However, some people also want to use plastic boxes for heating. Can plastic boxes be placed in the microwave? Next, let's talk about the precautions for plastic preservation boxes.  

 

Plastic fresh-keeping boxes can separate food or fruits, etc. And cover them to prevent odors, etc. It can be well preserved and easy to carry. Therefore, the use of fresh-keeping boxes is still quite widespread in daily life.  

 

Precautions for plastic fresh-keeping boxes.

 

When cleaning plastic freshness boxes, it is recommended to use a soft sponge. Using a hard dishwashing cloth can easily cause scratches and discolor plastic containers. When cleaning the silicone gasket between the box cover and the container, please do not pull it hard, otherwise it may break or become longer.  

 

If disinfected continuously, clean at a high temperature of around 70 degrees Celsius for no more than 20-30 minutes. If washing with a regular dishwasher, it is recommended to place it on the top of the dishwasher. Because even plastic products made of polypropylene have high heat resistance, if heated for a long time, the products will deform and elongate. After cleaning, if you need to use it immediately, you can soak the fresh-keeping box in cold water before use, which can effectively prevent deformation. 

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