Double Zero Aluminum Foil

Double zero aluminum foil refers to aluminum foil whose thickness shows two zeros after the decimal point when measured in millimeters. Its standard thickness range is 0.005–0.009 mm. Due to its ultra-thin characteristics, it is vividly called "Double Zero Foil".

This type of material has properties such as moisture resistance, airtightness, light shielding, abrasion resistance, and aroma retention. It is widely used in food, pharmaceutical, and cosmetic packaging.

Double Zero Aluminum Foil Specifications

• Alloy: 1235, 1145, 1100, etc. These grades have high aluminum purity (usually > 99%) and offer excellent ductility and corrosion resistance.
• Temper: commonly in O temper (annealed), making it soft and easy to form; H18 temper (hard) is also available for applications requiring higher strength.
• Thickness: common double zero foil thicknesses include 0.009 mm, 0.007 mm, 0.0065 mm, 0.006 mm, 0.0055 mm, etc.
• Width: ranging from several tens of millimeters to more than one thousand millimeters, depending on customer requirements and equipment capability.

Double Zero Aluminum Foil Features

• ‌‌Performance advantages: barrier rate up to 99.99%, temperature resistance from -55 to 125°C, surface wettability ≥34 dyn, suitable for extreme environments.
• Ultra-thin and lightweight: its core characteristic, providing excellent flexibility and formability.
• High barrier performance: effectively blocks air, water vapor, light, and microorganisms; one of the best packaging barrier materials.
• Electrical and thermal conductivity: maintains aluminum’s good conductivity and heat transfer properties.
• Eco-friendly & recyclable: aluminum can be recycled indefinitely, meeting modern environmental demands.
• High processing difficulty: due to the extreme thinness, production requires highly precise equipment, rolling techniques, and cleanliness, and is prone to issues such as breakage or pinholes.

Double Zero Aluminum Foil Applications

Double zero aluminum foil is widely used for food preservation packaging (such as carton milk liners), pharmaceutical moisture-proof packaging, 5G capacitor substrates, cigarette packaging, etc.

Due to its excellent performance, double zero aluminum foil is widely applied in high-end and precision packaging fields:

Food Packaging (Largest Application Field)

• Flexible packaging: laminated with plastics (such as CPP, PET) or paper for packaging snacks (chips, nuts), chocolate, candy, tea, coffee, and Tetra Pak milk.
• Containers: used to make food trays, takeaway boxes, cupcake cups, etc. (usually with a food-grade coating applied afterward).
• Retort pouches: suitable for high-temperature sterilization food packaging.

Pharmaceutical Packaging

• Blister packaging (PTP aluminum foil): the silver/golden layer on the back of tablet and capsule blister packs; it offers excellent moisture and light protection.
• Pharmaceutical aluminum-plastic composite bags: for packaging powders and granules.

Daily Chemical

• Beer labels: labels wrapped around premium beer bottles.
• Yogurt lid film: sealing film for cup-type yogurt.
• Cigarette packaging: moisture-proof foil paper for cigarette inner liners.

Lithium Batteries (A very important and rapidly growing application)

Used as a current collector for lithium-ion batteries, especially the positive electrode. The thickness uniformity and surface quality of double zero foil are critical to battery performance and safety.

Electronics & Electrical

• Used in capacitors, transformers, and other electronic components for insulation and heat dissipation.
• Used as shielding layers for high-frequency signal transmission.

Construction & Home

Used as facing material for insulation materials (such as glass wool and rock wool), providing heat reflection and moisture barrier.

Other Applications

• Tobacco packaging: moisture-proof and aroma-retaining
• Cosmetic packaging: high-end packaging for lipsticks, creams, etc.
• Insulation materials: laminated with rock wool to create high-performance insulation boards
• Capacitors: ultra-thin foil ensures high capacity and miniaturization

Haomei Double Zero Aluminum Foil Quality Standards

The key quality indicators of double zero aluminum foil are pinhole count and flatness accuracy:

Other key indicators:

• Thickness tolerance: controlled within ±0.0003 mm
• Flatness accuracy: ≤2×10^-4, ensuring smooth operation in high-speed automatic packaging
• Surface cleanliness: no visible bright lines, dark streaks, or pinholes allowed

Double Zero Aluminum Foil Production Process

Double zero aluminum foil must go through 18 precision processes, including cold rolling, high-temperature pressing, and stack rolling, reducing a 6.8 mm aluminum sheet to about 0.006 mm. Companies such as Kunshan Aluminum have optimized processes, reducing pinhole counts by 10–15% and improving barrier properties and surface gloss.

Double Zero Aluminum Foil vs. Single Zero Aluminum Foil

Double Zero Aluminum Foil Purchasing & Selection Tips

If you need to purchase or use double zero aluminum foil, pay attention to the following points:

• Thickness & tolerance: whether thickness is uniform and tolerance meets requirements.
• Pinhole count: the thinner the foil, the higher the probability of pinholes. Pinhole levels affect barrier performance and must be strictly controlled.
• Surface quality: whether the surface is clean, flat, free of oil, scratches, etc.
• Mechanical properties: tensile strength and elongation must meet processing and application needs.
• Hydrophilic/hydrophobic treatment: for lamination use, one or both sides may require special surface treatment.