Composite Packaging Bagsare made of multi-layer laminated materials, and not all types can hold hot water.
bags safe for hot water must have a food-grade high-temperature resistant inner layer (such as CPP or heat-resistant PE) without harmful coatings or adhesives.
Regular composite bags (e.g., BOPP/PE structure) have poor heat resistance—they tend to deform and release harmful substances when filled with hot water.
Common hot water-compatible types include
Retort Pouches (PET/BOPA/CPP structure), food-grade aluminum-plastic composite bags (with inner PE layer having a melting point above 120℃), and Tetra Pak paper-aluminum-plastic composite packages, which can also be indirectly warmed with
hot water.
- Check material structure: Prioritize products labeled "retort-grade" or "heat-resistant up to 100℃+". The core inner layer should be CPP or food-grade LDPE, and the outer layer reinforced with PET or BOPA for better heat resistance is preferred.
- Verify product labels: Confirm if the packaging has the "food contact use" certification (complying with GB 4806.13-2023 standard) and explicit instructions such as "boilable" or "safe for hot water filling".
- Avoid high-risk types: Aluminum foil-containing composite bags cannot be microwave-heated and only allow indirect warming. Snack bags or daily-use bags with BOPP outer layer and regular PE inner layer are strictly prohibited from holding hot water.
- Control temperature and duration: The temperature of hot water should not exceed 100℃, and continuous contact time should be less than 30 minutes. Avoid direct boiling or prolonged soaking.
- Standardize heating methods: For heating needs, packages like Tetra Pak can be warmed in hot water but not directly heated over open flames. For aluminum foil composite bags, transfer contents to glass containers before heating.
- Watch for abnormalities: If the bag deforms, emits strange odors, or leaks after holding hot water, stop using it immediately to prevent harmful substances from migrating into the water.
