What is the PE material of food packaging bags?

I. Core Understanding of PE Material: Definition, Characteristics and Safety Basis

• Intrinsic Properties: PE is a high-molecular organic compound polymerized from ethylene. Recognized as a high-quality food-contact grade material, it complies with national Food Packaging hygiene standards.
  
  
• Core Characteristics: Non-toxic, tasteless and odorless, with strong chemical stability, excellent low-temperature resistance (up to -100~-70℃) and moisture resistance. It features soft texture and good toughness.
  
  
• Safety Principle: It does not release harmful substances at room temperature and contains no risky components such as plasticizers, making it one of the most widely used safe materials in Food Packaging.

II. Classification of PE Material and Precise Application Scenarios

• High-Density Polyethylene (HDPE, Grade 2 Plastic): High hardness, good temperature resistance (≤110℃), oil resistance and impact resistance. Suitable for packaging meat, fried food, milk bottles, etc.
  
  
• Low-Density Polyethylene (LDPE, Grade 4 Plastic): Strong flexibility and ductility. Commonly used in cling film, fresh fruit and vegetable bags, and frozen food transportation packaging.
  
  
• Linear Low-Density Polyethylene (LLDPE): Combines the advantages of the above two types, with outstanding impact resistance and heat-sealing performance. Ideal for sealed packaging of snacks, dried foods and heavy-duty packaging scenarios.

III. Key Guidelines for Purchase and Usage

• Purchase Tips: Look for the "for direct food contact" label and SC production license. Prioritize colorless, transparent, odorless and smooth-surfaced products. Avoid unbranded, colored and strong-smelling bags.
  
  
• Usage Taboos: Do not heat at high temperatures (≤60℃) or contact hot food. Do not contain strong acids, strong alkalis and oily food for a long time. Do not reuse damaged or contaminated PE bags.
  
  
• Environmental Protection and Alternatives: Prioritize biodegradable PE products, classify and recycle after disposal to reduce "white pollution". Replace with PP material for high-temperature scenarios.