Laminated Glass: INTRODUCTION

PFG produces a range of quality laminated glass products, for application in buildings, homes, decorative and other uses. Our laminated glass is branded Intruderprufe and it is made when two pieces of glass (ClearVue and / or DecorVue) are joined together by a tough interlayer, called a polyvinyl butyral (PVB) plastic interlayer, that is bonded between the two pieces of glass under heat and pressure. The result is a high-performance glass material that can withstand hard blows from a solid object - and should the window break, the fragments stick to the interlayer and so the integrity of the window is maintained.

Intruderprufe offers a range of functional, design and building-related benefits including security, safety, solar and sound control solutions, as well as UV protection, decorative uses and energy efficiency benefits.

PFG's laminated glass has been tested by repeatedly dropping a 225g steel ball from a height of nine metres. Each drop is equivalent to a hammer blow. The number of blows required to penetrate the glass is as follows:

Laminated strength	Number of blows	Rating
NS	3	1
HPR	8	2
HI	24	3

Laminated glass is similar to the glass used in car windscreens. The PVB interlayer is clear and therefore invisible when viewed through the glass. However, interlayers can be tinted to produce colours for architectural applications.

The thickness of a PVB interlayer affects the level of safety of the glass. By increasing the thickness, levels of safety in excess of the minimum legal requirements can be achieved. 

Risk	PVB thickness	Rating Low
Low	0,38mm	1
Medium	0,76mm	2
High	1,52mm	3