Common materials for eight-side seal packaging bags: The commonly used composite packaging films for eight-side seal packaging bags include the following:
1. Double-layer plastic-plastic composite film: Polyester/Polyethylene PET/PE, Nylon/Polyethylene NY/PE. Suitable for: general packaging, no need for high-temperature sterilization, can transparently display contents.
2. Double-layer plastic-plastic high-temperature sterilization film: Polyester/Polypropylene, Nylon/Polypropylene.
Suitable for: high-temperature sterilization, resistant to temperatures above 110°C-120°C. Can transparently display contents.
3. Three-layer aluminum-plastic composite film:
Eight-side seal stand-up bag Polyester/Aluminum/Polyethylene PET/AL/PE, Nylon/Aluminum/Polyethylene NY/AL/PE
Polyester/Aluminum/Polypropylene  Nylon/Aluminum/Polypropylene
Suitable for: premium packaging, light-blocking, does not display contents.