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# Moisture Barrier Foil Bag – Key Advantages & Features
1. Outstanding Moisture & Vapor Barrier Performance
This moisture barrier foil bag adopts multi-layer aluminum foil composite structure with extremely low WVTR, effectively blocking moisture, oxygen, salt mist and static. It can keep humidity stable below **10%RH** inside the bag, fully preventing rust, oxidation and mildew during long ocean shipping and storage.
2. Customizable Zipper & Reusable Design
We support adding **custom zipper closure** for repeated opening and closing, greatly improving operation efficiency. Unlike traditional one-time sealed bags, this design allows frequent access to equipment while maintaining excellent barrier performance, making it more convenient for inspection and storage.
3. Optional Soft Lining for Extra Protection
Soft flannel or foam lining can be added during customization to protect precision surfaces, painted parts and fragile components from scratches, collision and abrasion. This upgrade makes the moisture barrier foil bag ideal for high-value CNC machines and precision equipment.
4. Strong Compatibility with Vacuum Packaging
The bag features high sealing strength and perfect air tightness, fully supporting vacuum packaging. It removes air completely to reduce volume and enhance stability during transportation, providing all-round compression and protection for heavy machinery and metal parts.
5. Full Customization in Size & Structure
We offer complete customization of dimensions, thickness, zipper position and lining material. Each moisture barrier foil bag can be tailored to various equipment, ensuring perfect fit, better protection and wider application in industrial packaging and logistics.
| TECHNICAL DATA SHEET | ||
| 3 layers Aluminium foil | ||
| Type/Model: | PET+AL+PE（VCI） | |
| Thickness: | PET13um , AL7um , PE220um | |
| Strength test report: | ||
| Test Item: | Tensile strength, breaking strength, Elongation at break, tear strength | |
| 1 Test Ambient: | temperature 21-22°C relative humidity 51-55%RH | |
2 Test Instruments:
| devicename | device number | |||
| 1 | EJA Vantage | WXR1330 | ||
3 Test Process:
| Test Item | Test Condition | |||||
| Puncture strength | 50mm/min steel needle 1.0mm | |||||
| WVTR | Infrared detection sensor method | |||||
| MaxF, Tensile strength, Elongation at break | 250mm/min | |||||
4 Test Resuil
| Test Item | Test Resuil | |||||
| Puncture strength | 19.2N , 18.6N | |||||
| WVTR | ＜0.005（Detection limit 0.005） | |||||
| 1# | 2# | 3# | 4# | 5# | AVERAGE | |
| Tensile strength(MPa) | 32.6124 | 33.438 | 31.7664 | 32.7876 | 32.3616 | 32.5932 |
| breaking strength(MPa) | 18.7476 | 19.0272 | 20.7588 | 20.3844 | 20.9208 | 19.96776 |
| Elongation at break(%) | 297.048 | 297.042 | 296.8656 | 296.9436 | 297.4236 | 297.06456 |
| tear strength(N/mm) | 407.6472 | 417.9756 | 397.0752 | 402.6768 | 411.2376 | 407.32248 |
| Max F(N) | 73.3764 | 75.2352 | 71.4732 | 73.5744 | 74.5344 | 73.63872 |
5 VCI Protection
Application: For multipal metals
Protection period: 6-24months, depends on packing condition and environment.
Moisture Barrier Foil Bag – Application Scenarios
1. Precision Machinery & CNC Equipment Packaging
Ideal for CNC machines, automation equipment and precision instruments. The moisture barrier foil bag effectively isolates humidity and oxygen, preventing rust and corrosion. With optional soft lining, it protects painted and precision surfaces from scratches during transport and storage.
2. Metal Parts & Mold Long-Term Storage
Suitable for molds, castings, forgings and metal components. Its high barrier performance keeps contents dry and clean, greatly extending storage time. Custom zipper design allows frequent inspection without damaging the bag’s protection.
3. Overseas Export & Ocean Shipping
Widely used for international cargo transportation. It resists salt spray, high humidity and harsh marine environments, protecting goods from moisture damage during long sea voyages. Perfect for industrial equipment export worldwide.
4. Electronics & Moisture-Sensitive Products
Applied to circuit boards, motors, generators and electronic components. The anti-moisture and anti-static structure keeps products stable and functional, avoiding short circuits or performance failure in humid environments.
5. Aerospace & High-Value Equipment
Used for high-value, sophisticated equipment that requires strict protection. With zipper and soft lining, the moisture barrier foil bag provides safe, reusable and premium packaging for transportation and long-term preservation.
How to Use Moisture Barrier Foil Bag
Place your item carefully into the moisture barrier foil bag. Close the zipper fully, then apply adhesive tape over the zipper surface to ensure complete airtightness. For optimal effect, use a vacuum pump to remove air. Avoid sharp edges piercing the bag. Store in a dry, ventilated place. The zipper plus tape design ensures superior sealing, while the soft lining protects surfaces from scratches.
# Moisture Barrier Foil Bag – FAQ
1. Why tape over the zipper?
The zipper alone cannot reach full airtightness. **Taping over the zipper** greatly improves moisture barrier performance, prevents vapor penetration, and ensures long-term anti-rust effect for storage and shipping.
2. Can the bag be reused?
Yes. With zipper design, it can be opened and closed multiple times. Just re-seal with new tape for reuse. Soft lining remains protective, making it economical for repeated packaging.
3. Is it suitable for vacuum packing?
Yes. The multi-layer foil material is strong and airtight, supporting vacuum packaging. Zipper plus tape ensures no air leakage, effectively reducing volume and protecting equipment during transport.
4. Can I customize zipper and soft lining?
Absolutely. We support custom size, zipper position, and soft flannel/foam lining. This enhances convenience and surface protection, ideal for precision machinery and molds.
