What is double-layer laminated glass? A detailed look at processing and applications

Double-layer laminated glass—also known simply as laminated glass—is a composite product formed by sandwiching one or more layers of organic polymer interlayers between two or more sheets of glass. Through specialized high-temperature pre-pressing and high-temperature, high-pressure processing, the glass and interlayers are bonded into a single, integrated unit.

Common interlayer materials include PVB (polyvinyl butyral), SGP (ionoplast interlayer), EVA (ethylene-vinyl acetate copolymer), and PU (polyurethane). These interlayers are characterized by transparency, elasticity, strong adhesion, and excellent penetration resistance.

Even if the glass breaks, the fragments adhere to the interlayer, keeping the broken surface neat and smooth; this effectively prevents injuries from sharp shards and accidents involving falling glass.

Production Methods:

1) Film Heat-Pressing Method (Dry Method): Glass sheets and interlayers are stacked in sequence and placed in an autoclave. They undergo heat-pressing at specific temperatures and pressures to firmly bond the interlayers to the glass. Laminated glass produced this way offers stable quality and reliable performance, making it the mainstream production method today.

2) Grouting Method (Wet Method): Prepared liquid resin is poured into the gap between two glass sheets. It then undergoes a curing process, causing the resin to solidify into an interlayer that bonds the glass sheets together.

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