Laminated safety glass and types of laminated glass

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Posted on : 2020-Nov-30

Laminated glass is made of two or more glasses which are sticked together with a thin vinyl layer in between to form a permanent bond and give transparent glass finish, these layered glass support and hold the glass to create a strong, uniformed layer. Laminated glass comes in varying thicknesses and can be created using different glass combinations. The strength of laminated glass makes it almost impossible to break, even if broken glass doesn’t shatter, when broken the thin vinyl layer in between holds it.

There are three commonly used vinyl for laminated glasses.

Polyvinyl Butyral (PVB) : This type of vinyl is used widely in automobile and architectural glasses.

Ethylene vinyl acetate (EVA) : EVA has a good fluidity of the film layer, EVA can be used in an extended range of applications because it is so much functional thermoplastic than PVB.
Sentry Glass Plus (SGP) is composed of a tough and rigid plastic interlayer composite that is laminated between two layers of tempered glass, originally developed by DuPont

Comparing PVB and EVA

PVB has low adhesiveness to glass. It also has a high hygroscopicity. PVB has a higher tendency to permeate water than EVA, PVB laminated glass suffers from water penetration around the edges so it is better to use EVA lamination where there is frequent water contact example: floor glass, bathroom glass etc . 

UV resistance for EVA is comparatively less. 

SGP Advantages.

Greater security from threats such as severe weather

Used as bullet proof glass
Can withstand bomb blast performance requirements
Greater durability in elevated temperatures
Fragment retention
Thinner and lighter than PVB