Safety and Security
CET offers a range of glazing options for use in safety and security applications, including toughened, laminated and fire resistant glass.
Toughened glass is produced by heating regular float glass after it has been cut to size and edge worked (arrissed). To increase its strength, the glass is passed through a furnace and is heated to 680◦C and then rapidly cooled with forced air. The toughening process puts the outer surfaces into compression and the inner surfaces into tension, causing the glass, when broken, to crumble into small granular chunks instead of splintering into jagged shards. Toughened glass is up to five times stronger than ordinary glass of the same thickness. Because of its increased strength, it offers architects and builders far greater scope in their use of glass in buildings, especially in situations where safety is a key requirement. Where specific barrier loadings are specified, calculations can be obtained through CET’s Technical Department.
Laminated glass is a type of glass that will not shatter or collapse under normal bodily impact, retaining its integrity within the frame. It consists of two sheets of glass with a polyvinylbutyral (PVB) interlayer, bonded under heat and pressure into a single unit to provide personal protection against injury by glass due to it collapsing or through falling through the glass.
The interlayer keeps the layers of glass bonded even when broken and its high strength prevents the glass from breaking up into large sharp pieces. Laminated glass is normally used when there is a possibility of human impact or where the glass could fall if shattered.
Laminated glass is used in situations where resistance to manual attack is required, or to slow down illegal entry into a building, such as to meet the requirements of Approved Document Q and Secured by Design specifications.
Laminated glass is also used to improve the sound insulation rating of a window.
All laminated interlayers (PVB) have an anti UV value helping to reduce fading in the home.
Fire Resistant Glass
CET processes PyroCET fire resistant glass for some of the UK’s most respected fire and safety glass specifiers, supplying exclusively through our partner, Promat Securiglass. Fire resistant safety glass significantly increases the resistance of glazed products to fire, heat and physical or ballistic attack.
Complying with British Standard BS476 part 22, our glass is capable of maintaining its physical integrity by insulating against heat for up to 120 minutes, depending on the glazing system, giving ample time for fire control measures and rescue to take place.
There is a wide range of PyroCET variations in single and double glazed combinations for fire-resistant applications. We process tested glass sizes from 100mm x 100mm up to 1400mm x 2700mm and the vast majority of our products carry Class A safety ratings.
CET’s versatility and high standards are reflected in the quality of our products and service, enabling our customers to supply some of the best solutions and products on the market. We offer a bespoke service, so please contact us to discuss your specific requirements.
You should note that fire resistant glass only works if it is part of a fully tested and compliant fire glazing system.