PET Films for PV & Solar

Product Summary

If you make photovoltaic (PV) cells and solar modules for garden lighting, camping and domestic power supplies, and right up to large commercial arrays, the materials you use impact the products’ reliability, lifespan, and—ultimately—your reputation as a manufacturer, in a big way.

That’s why it’s crucial to choose the right films for PV cells, front sheets, back sheets, and thin-film substrates. This where two films from Dupont Teijin Films shine: Melinex® 6428 and Mylar A® PET polyester films. DuPont Teijin is the world’s largest supplier of cost-effective PET films, with more than five decades of expertise in developing products tailored to the PV and solar industry.

As North America’s largest authorized, value-adding distributor of Melinex® and Mylar A® PET films [TM1] with five film centers – three in the USA, one in Canada, and one in Mexico –PolymerFilms makes ordering and delivery fast and easy.

Not sure about which type to choose? Our experts will help you make the right decision and ensure value for money.

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Product Benefits

Resists tearing, preventing film damage during handling, processing and installation
High moisture impermeability: For solar module back sheets, the low WVTR) keeps sensitive equipment dry in humid environments.

Just 0.6% shrinkage at 300°F (150°C), providing decades-long stability in the harshest of climates

Provides high safety in front and back sheets and flexible PV cells by minimizing the risk of electric shock

Withstands temperatures from -100 up to +300°F (-73 to +150°C), making it ideal for long-lasting back sheet laminates in any environment

0.8-1.1% shrinkage (depending on gauge) at 300°F (150°C), providing decades-long stability and minimal distortion in laminates in very hot and cold conditions

88.5% visible light transmission enables high solar cell efficiency due to very low transmission loss in front sheets

Remains intact for decades under strong UV light, lengthening module service life

The low water vapor transmission rate (WVTR) 0.9 g/m2/day[TM1] protects delicate underlying components from destructive moisture for decades, improving PV service life and reducing replacement costs over the long term

Toughness makes it easy to process and install, and protects against “cut-through” damage

Pretreated to bond securely to other layers and encapsulants

Damage Prevention
Dimensionally Stable
Excellent Insulator
Extreme Temperature Tolerance
High Dimensional Stability (Solar)
High Light Transmission
High UV Resistance
Outstanding Moisture Impermeability
Resists Tearing
Strong Adhesion

Challenges and Solutions

You’re bidding for a contract to manufacture solar modules for use in tropical locations where humidity will degrade their performance without suitable protection. So the modules need stable films to protect against water-vapor permeation and retain their dimensions over decades, not years.
With its outstanding moisture resistance and long-term dimensional stability, use Melinex® 6428 for the front sheet substrate and in bilaminate or trilaminate films for back sheets, and Mylar A® sandwiched between two layers of Dupont™ Tedlar® PVF film[TM1] for back sheets. While these films may not be the cheapest options up front, their reliability and performance protect the modules for decades, reducing maintenance and replacement costs over the long term.
In large arrays that are rarely cleaned manually or by rain, dust can reduce PV efficiency, so every photon that reaches the conductors matters.
With a Total Light Transmission of 88.5%, using Melinex® 6428 as the substrate for front sheets helps to maximize the amount of sunlight reaching the conductors, enabling them to produce more electricity, all things considered.

Frequently Asked Questions

Please ask our friendly Sales team, who will be happy to supply you with the specifications to help you make a decision.

For solar and PV applications, Melinex® 6428 is commonly laminated onto EVA as a substrate to form sturdy encapsulant films. New back sheet designs also use two or three layers of Melinex® 6428 bonded together. Mylar A is sandwiched between two layers of DupontTM Tedlar® PVF film to create the popular back sheet film TPTTM laminate. Please ask our friendly Sales team, who will be happy to supply you with a comprehensive list.

Please contact your nearest PolymerFilms center by phone or email, fill in the contact form, or request a quote.

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