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| Parameter Category | Parameter Name | Parameter Value/Description | Test Standard |
| Material Structure | Number of Layers and Material | 3-layer composite: Outer layer: PET (Polyester film) Middle layer: AL (Aluminum foil) Inner layer: PE (Polyethylene film) |
- |
| Total Thickness | Typical range: 80-150μm (Customizable according to needs) | ASTM D6988 | |
| Physical Properties | Tensile Strength (Longitudinal/Transverse) | ≥50 MPa (PET layer) ≥20 MPa (PE layer) |
ASTM D882 |
| Elongation at Break | PET layer: 50-150% PE layer: 200-500% |
ASTM D882 | |
| Tear Strength (Elmendorf Tear) | ≥50 N/mm (PET layer) ≥30 N/mm (PE layer) |
ASTM D1922 | |
Barrier Properties |
Oxygen Transmission Rate (OTR) | ≤0.5 cm³/(m²·day·atm) | ASTM D3985 |
| Water Vapor Transmission Rate (WVTR) | ≤0.1g/(m²·day) | ASTM F1249 | |
| Transmittance | Opaque (AL layer light shielding) | ASTM D1003 | |
| Chemical Properties | Chemical Resistance | Acid, alkali, and grease resistant, suitable for food and chemical packaging | GB/T 5009.60 |
| Hygiene and Safety | Meets food-grade standards (FDA, EU, etc.) | FDA 21 CFR177.1390 | |
| Heat Sealing Performance | Heat Sealing Temperature Range | 140-180℃ (PE layer heat sealing) | ASTM F2029 |
| Heat Seal Strength | ≥25 N/15mm | ASTM F88 | |
| Applicable Standards | Industry Standards | GB/T10004, ASTM F2029, ISO 11607 (Medical Packaging) | - |
| Application Range | Typical Uses | Food packaging, pharmaceutical packaging, moisture-proof packaging for electronic components, etc. | - |
| Other Characteristics | Temperature Resistance | -20℃~120℃ (Short-term high temperature resistance) | - |
| Printability | PET layer is printable, strong color rendering | - |
Material characteristics: Polyethylene is polymerized from ethylene and has the characteristics of being non-toxic, odorless, acid and alkali resistant, low temperature resistant, waterproof and insulating. It is widely used in the packaging field.
Classification and structure
Classified by material density:
High-pressure PE bag (LDPE): Made of low-density polyethylene, it is flexible and transparent, suitable for food preservation film, soft packaging, etc.
Low-pressure PE bag (HDPE): Made of high-density polyethylene, it has high hardness and strong puncture resistance, suitable for heavy object packaging or industrial use.
Recyclable PE bag: Made of recycled polyethylene (such as Recycled LDPE/HDPE), which conforms to the environmental protection trend.
Classified by use and process:
Flat bag: The bottom is sealed, the structure is simple, and it is used for packaging lightweight items.
Resealable bag/zip lock bag: With a reusable sealing strip, it is convenient for storing food or small items.
Anti-static PE bag: Anti-static masterbatch is added to protect electronic products from electrostatic damage.
Core characteristics
Safety:
Food-grade PE bags meet national standards (GB4806.7-2016), are non-toxic and odorless, and are suitable for room temperature food packaging.
Not suitable for high temperature (>110℃), high oil or frozen environments, as it may release harmful substances.
Physical properties:
Low-temperature resistant (-50℃ to 80℃), good chemical stability, but easy to age at high temperatures.
High-pressure PE bags have high toughness but low strength; low-pressure PE bags have high strength but poor ductility.
Environmental protection:
Recyclable PE materials support recycling, reducing resource waste.
Application scenarios
Food packaging:
LDPE cling film is used for preserving vegetables and meat; HDPE bags are used for loose food in supermarkets.
Industry and logistics:
Anti-static PE bags are used for packaging electronic components; HDPE heavy-duty bags are used for transporting machinery parts.
Daily life:
Resealable bags store jewelry and small items; flat bags are used for packaging clothing and daily necessities.
Keyword:
PET/AL/PE composite bag
It has the characteristics of flexibility, chemical corrosion resistance, and water resistance, and is widely used in packaging, agricultural covering, and industrial protection.
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