What Is Enhanced Adhesion Metallized PET Film?

Enhanced adhesion metallized PET film (also referred to as chemically treated surface metallized PET) is produced by applying a chemical treatment​ to one side of a BOPET base film before vacuum metallization. The aluminum layer is deposited directly onto this chemically activated surface, resulting in significantly stronger metal-to-film adhesion​ compared to standard untreated metallized PET.

Key difference from standard metallized PET:​ In standard grades, the aluminum is deposited on a corona-treated or untreated surface. In enhanced adhesion grades, a dedicated chemical primer/treatment is applied to the base film prior to metallization, creating covalent bonding sites for the aluminum atoms.

How It Compares to Standard and Coated Metallized PET

Key Properties

1. Superior Aluminum Layer Adhesion

• Chemical treatment creates a reactive surface that anchors the aluminum layer firmly

• No peeling, flaking, or micro-cracking during converting (slitting, bag-making, filling)

• Essential for liquid, moist, or oily contents

2. Excellent Water Resistance

• The enhanced metal-to-film bond resists hydrolysis and delamination when exposed to moisture

• Suitable for pasteurization​ (hot water bath up to ~85–95°C) and boil-proof applications

3. High Barrier Performance

• Oxygen barrier:​ OTR typically ≤2 cc/m²·24h (ultra-high barrier grades ≤0.5)

• Moisture barrier:​ WVTR typically ≤2 g/m²·24h (ultra-high barrier grades ≤0.5)

• Opaque to light – protects light-sensitive products

4. Outstanding Mechanical Properties

• Excellent flatness and stiffness for high-speed packaging lines

• Good tensile strength and dimensional stability

• Flex-crack resistance​ – the aluminum layer withstands repeated bending without fracturing, critical for pouches and sachets

5. Metallic Gloss Finish

• Bright silver appearance enhances shelf appeal

• Compatible with reverse printing and lamination

6. Pasteurization Compatibility

• Can withstand pasteurization processes (e.g., 85°C for 30 minutes) without delamination or barrier loss

• Enables extended shelf life for refrigerated and ambient-stable products

Applications

 Food Packaging Requiring Pasteurization

• Sauce and condiment pouches​ (ketchup, mayonnaise, salad dressing)

• Soup and broth sachets​ (pasteurized for ambient storage)

• Baby food pouches​ (sterilized via hot water bath)

• Pickled vegetable and kimchi packaging​ (acidic + moisture environment)

 Coffee & Tea

• Stand-up pouches for roasted coffee beans (oil resistance + barrier)

• Tea bag overwrap (moisture barrier + flex-crack resistance)

Pharmaceutical & Nutraceutical

• Moisture-sensitive tablet and capsule packaging

• Powder sachets (protein, electrolyte mixes)

 Cosmetics & Personal Care

• Lotion sample sachets

• Shampoo and conditioner refill pouches

• Face mask packaging (requires water resistance)

 Meat, Seafood & Dairy

• Processed meat pouches (ham, sausages) – pasteurization step

• Cheese packaging (moisture barrier + flex-crack resistance)

Technical Specifications (Typical Range)

FAQ (SEO Snippet Target)

Q: What is enhanced adhesion metallized PET film?​

A: It is BOPET film that receives a chemical treatment on the metallization side before vacuum aluminum deposition, resulting in much stronger aluminum adhesion than standard metallized PET.

Q: Can enhanced adhesion metallized PET be pasteurized?​

A: Yes. The strong metal-to-film bond and water resistance allow it to withstand pasteurization processes (e.g., 85°C hot water bath) without barrier loss or delamination.

Q: How does it differ from pre-coated metallized PET?​

A: Pre-coated (coated) metallized PET treats the non-metalside for better lamination. Enhanced adhesion treats the metalside for better aluminum anchorage and water resistance. They solve different problems.

Q: Is this film suitable for coffee packaging?​

A: Yes. Its oil resistance, barrier, and flex-crack resistance make it an excellent choice for coffee stand-up pouches and valve-equipped bags.

Q: Does enhanced adhesion affect printability?​

A: The non-metal side can be corona-treated or coated separately for printing. The enhanced adhesion treatment is only on the metal side and does not interfere with reverse printing.

Conclusion

Enhanced adhesion metallized PET film fills a specific but important niche: applications where water resistance, pasteurization, and strong aluminum anchorage​ are critical. By chemically activating the metallization surface, manufacturers eliminate the weak point of standard metallized films — metal peeling under wet or thermal stress.

For converters producing pouches for sauces, soups, baby food, and other pasteurized products, this grade offers a reliable, high-performance alternative to foil laminates or expensive multi-layer structures.