PV encapsulation film materials

Selection considerations

What the encapsulant does

Encapsulation film holds the cells in place, couples light from the front glass to the cells and shields the circuit from moisture and mechanical stress over the life of the module. One sheet goes under the strings from the cell stringer and another over them, with glass in front and glass or a backsheet behind. Operators or automation place the sheets at layup, and the film melts and crosslinks in the laminator. The film class sits in the module assembly stage beside the other bill-of-materials items fed into a module line.

Matching film to machine and stack

An encapsulant qualifies as part of a stack and a recipe, never on its own. Ask the film maker for a laminating window that suits your press, then confirm it on your own machine; the laminator specification guide lists which press settings and records belong in the order. Heterojunction and some other cell routes call for gentler lamination temperatures, so check compatibility with your cell technology when choosing a film. Check which side of the cells each film is meant for: UV-transmitting grades let more light reach the cell, while UV-cutting grades shield rear materials. Agree roll width, length, core and packaging with your layup equipment, and set storage rules, because humidity and heat before use change how the film behaves in the press.

Ageing and inspection

After lamination, look for bubbles, shrinkage and delamination at visual inspection, and plan damp-heat and UV exposure on finished samples with environmental testing equipment before a new film enters volume production. Cameras after the press find bubbles and foreign matter faster than people do, and the vision guide explains what to test. Lot certificates, adhesion data and ageing results are covered in qualifying PV module materials. Tie each film lot to the module serial through your traceability and MES set-up so a field issue can be traced to the roll.

The film listed here

The directory lists F406P / F406PS normal EVA encapsulation film from Hangzhou First Applied Material. These are the UV-transmitting pair in FIRST's normal EVA series, and one published data column covers both, so order by the exact suffix and its own technical sheet. Settle the suffix and module side, then ask FIRST to confirm roll sizes, storage terms and the laminating window for your laminator in writing. Use the published values to build a shortlist and your own module trials, planned like a machine trial with FAT and SAT stages, to approve the film.

Plan the equipment scope

Identify the production step, cell or module format and output unit before comparing equipment. Use the listed source, scope and specifications to prepare a configuration-specific enquiry. Missing values are left unspecified and do not count as exact filter matches.

Read equipment buying guides or prepare a sourcing brief.