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What Is Coated Polyester Metallized Film (Pre-Coated PET Metallized Film)?

Coated polyester metallized film — also referred to as pre-coated PET metallized film​ or primer-coated metallized PET​ — starts with a transparent BOPET base film that undergoes vacuum metallization on one side, while the non-metallized surface receives a special surface treatment (coating)​ .

This coating serves a critical function: it dramatically improves lamination bond strength​ when the film is later combined with other substrates (PE, CPP, paper, aluminum foil). Without this treatment, the non-metallized PET surface can delaminate under stress or wet conditions.

Key distinction:​ Standard metallized PET has no treatment on the non-metal side. Pre-coated metallized PET has a functional coating on the non-metal side specifically engineered for stronger adhesion in multi-layer laminates.

How It Differs from Standard Metallized PET

Key Properties

1. Superior Mechanical Performance

• Excellent flatness and stiffness​ — runs smoothly on high-speed packaging lines
• Good tensile strength and dimensional stability
• Resists curling and wrinkling during lamination and printing

2. Heat & Chemical Resistance

• Withstands temperatures encountered in heat-sealing and lamination processes
• Resists attack from oils, acids, and common solvents found in food and industrial environments

3. Outstanding Dimensional Stability

• Low thermal shrinkage ensures register accuracy in multi-color printing
• Maintains flatness across varying humidity conditions

4. Strong Metal Adhesion

• The vacuum-deposited aluminum layer bonds tightly to the PET base
• No flaking or peeling during converting (slitting, rewinding, bag-making)

5. High Barrier Performance

• Oxygen barrier:​ OTR typically ≤2 cc/m²·24h (can reach ≤0.5 with ultra-high-barrier grades)
• Moisture barrier:​ WVTR typically ≤2 g/m²·24h (can reach ≤0.5)
• Opaque to light — protects light-sensitive contents

6. Metallic Gloss Finish

• Attractive silver mirror-like appearance enhances shelf presence
• Compatible with reverse printing and over-lamination for branding

Applications

Food Packaging

• Coffee and tea pouches (oil resistance + barrier)
• Snack food bags (crisps, nuts, biscuits)
• Condiment sachets (ketchup, soy sauce, chili oil)
• Retort pouches (ready meals, soups, pet food) — when combined with appropriate sealant layer

Pharmaceutical Packaging

• Blister backing foil lidding
• Strip pack wrapping for tablets and capsules
• Moisture-sensitive nutraceutical packaging

Cosmetic & Personal Care

• Lotion sachets and sample packs
• Face mask packaging
• Perfume box inserts and decorative wraps

Electronic Components

• Phone reflector film​ — the metallic surface acts as a light reflector in backlight units and display modules
• EMI shielding layers
• Insulation spacers and die-cut parts in batteries and PCBs

Why phone reflector film?​ The combination of high reflectivity (from the aluminum layer), dimensional stability, and thin gauge makes pre-coated metallized PET ideal for directing light evenly across LCD/LED backlight assemblies.

Technical Specifications (Typical Range)

FAQ (SEO Snippet Target)

Q: What is pre-coated PET metallized film?​

A: It is BOPET film that is vacuum-metallized on one side and has a special surface coating on the non-metallized side to improve lamination bond strength with other substrates.

Q: Can pre-coated metallized PET be used for retort packaging?​

A: Yes. When combined with a suitable sealant film (such as CPP or RCPP), the pre-coated surface provides the adhesion needed to survive high-temperature retort processing.

Q: Is pre-coated metallized PET suitable for phone reflector film?​

A: Yes. Its high reflectivity, dimensional stability, and thin gauge make it a preferred material for backlight reflectors in mobile phone displays.

Q: How does the coating improve lamination strength?​

A: The coating increases surface energy and provides chemical bonding sites, allowing adhesives to anchor more effectively to the PET surface than untreated PET.

Q: Is this film printable on the non-metal side?​

A: Yes. The special surface treatment enables good ink adhesion for reverse printing (commonly used in laminated packaging structures).

Conclusion

Coated (pre-coated) polyester metallized film bridges the gap between standard metallized PET and demanding packaging requirements. By treating the non-metallized surface, manufacturers achieve stronger laminations, better process reliability, and expanded application scope​ — from everyday snack pouches to precision electronic components like phone reflector films.