Attribute	Description
Material Composition	4-layer composite: BOPET (outer layer) for durability and UV resistance, aluminum foil (AL) for ultra-barrier protection, EVOH copolymer for oxygen blocking, and food-grade LLDPE (inner layer) for heat-sealing. Reinforced with an aroma lock valve to release CO₂ while preventing oxygen ingress 1 4 .
Aroma Preservation	Patented one-way degassing valve maintains coffee freshness by releasing CO₂ from roasted beans without allowing external air to enter 1 4 .
UV Light Blocking	AL layer blocks 99% of UV light (280–400nm wavelength) to prevent photo-oxidation and flavor degradation 1 4 .
Nitrogen Flushing	Optional nitrogen-flushed packaging extends shelf life to 18–24 months by reducing residual oxygen to ≤1% 1 .
Sustainability	LLDPE layer contains 20–30% post-consumer recycled content (GRS-certified); AL foil recyclable via dedicated streams 2 4 .

Parameter	Specifications
Layer Thickness	BOPET: 12–18μm
Barrier Performance	- Oxygen Transmission Rate (OTR): ≤0.05 cc/m²/day 4 - Water Vapor Transmission Rate (WVTR): ≤0.1 g/m²/day 1 .
Mechanical Strength	- Tensile Strength: ≥250 MPa (ASTM D882) 2 - Burst Resistance: ≥4.5 kPa (ASTM F1140).
Valve Specifications	- Valve Diameter: 40mm - Flow Rate: 0.5–1.0 L/min (CO₂ release under 1 atm pressure).
Dimensions	- Standard Sizes: 250g (15×20cm), 500g (20×30cm), 1kg (25×35cm) - Custom Width: 150–600mm 3 .
Heat Seal Performance	- Seal Strength: 30–45 N/15mm - Sealing Temperature: 130–180°C (compatible with vertical form-fill-seal machines) 3 .
Certifications	FDA 21 CFR 177.1390 (food-grade), ISO 22000:2018, and BRCGS Packaging Materials Standard 1 4 .
Printing Compatibility	High-resolution flexographic/digital printing (up to 10 colors) on BOPET surface (≥52 dyne/cm corona-treated) 3 .