Solar Encapsulation Materials (EVA / POE)

Abstract

This report focuses on the key polymers in PV module encapsulation — EVA and POE films, plus backsheets and silver paste. The central question is how demand structure shifts toward POE-based films as N-type cells (TOPCon, HJT) and bifacial modules gain share, and whether EVA capacity faces structural idling.

It covers demand, capacity and price transmission for both chemistries and assesses how PID resistance and water-vapour transmission requirements constrain formulation.

Key findings

• Global EVA film demand reached roughly 1.76 million tonnes in 2025, a 23% CAGR over 2020–2025.
• POE film demand was approximately 0.5 million tonnes in 2025 with a 35% CAGR, the faster-growing encapsulation route.
• Rising N-type and bifacial penetration is displacing single-layer EVA with POE and EPE co-extruded structures.
• PID resistance and moisture barrier performance are the core requirements for N-type modules and directly determine formulation.
• POE pellets were heavily import-dependent; domestic supply progress sets film makers' cost flexibility.
• EVA capacity faces structural idling risk: commodity grades may oversupply while PV-grade high-MFI resin stays tight.