What materials are commonly used to make self sealing bags?

Self sealing bags are usually made of the following materials:

1. Polyethylene (PE): This is the most commonly used material, especially low-density polyethylene (LDPE), because it has the characteristics of softness, transparency, and durability, suitable for food packaging and storage of daily items.

2. Polypropylene (PP): This material is slightly harder than polyethylene and is typically used for packaging that requires higher transparency and strength. Self sealing bags made of PP material are commonly used for packaging clothing, books, etc.

3. Polyvinyl chloride (PVC): Although not as commonly used as PE and PP, PVC is also used to make certain self sealing bags, especially in applications that require higher strength and chemical resistance.

These materials provide excellent moisture, dust, and preservation functions, making self sealing bags a versatile storage solution. Choosing appropriate materials according to different purposes can better meet storage needs.