What is laminated glass? How many kinds of interlayer films?

Laminated glass is also called safety glass, it is made of two or multiple glass pieces with interlayer film under high temperature and high pressure. Laminated glass is featured by the followed characteristics.

Laminated-glass_副本

First, Good security. The interlayer part have good toughness, superior cohesiveness and high penetration resistance. The fragments after glass broken will stick together tightly without scattering, other products couldn’t penetrate it easily, then the laminated glass could provide safety for the humans and properties. The laminated glass which been used in the high curtain wall won’t drop to cause damage, meanwhile could stop the people and subjects from penetrating the glass and fall. Then it belongs to the safety glass indeed.

Second, high ultraviolet-proof performance. The interlayer in the laminated glass, especially the PVB layer have superior ultraviolet absorption function, could filtrate the ultraviolet which pass through the laminated glass, its filtration function could be ups to 99%.

Third, Good sound-proof performance. The interlayer in the laminated glass could absorb the sound wave, especially the PVB layer have superior sound-proof effect, and the sound-proof PVB in the market have excellent sound-proof performance.

There are there kinds of inter-layers for the laminated glass, PVB, EVA and SGP. The PVB film is mostly used with the longest history. Followed chart shows the difference for the characteristic in the three types of interlayer.

Difference-for-PVB-EVA-and-SGP_副本

PVB is abbreviation of Polyvinyl Butyral, it have good cohesiveness to glass, but couldn’t stick to metal well, the water resistance is bad. When the temperature is higher than 70℃, the cohesiveness faded fast. When the PVB is used outside and exposed, it easily come unglued. The color of PVB is different, clear, white, pink, blue, green, yellow, red, and other colors can be custom made according different requirements. The normal thickness for the PVB is 0.38mm, 0.76mm, 1.14mm, 1.52mm. It can be used overlying according different color and thickness requirements.

PVB-film_副本

With the requirements for the sound-proof effects, sound-proof PVB is become more and more popular. The sound-proof PVB have better dampening function than normal PVB, it can restrain the noise propagation, especially for the building which is near airport, station, shopping center and beside the road, the sound-proof effect is perfect.

EVA-Film_副本

EVA is abbreviation of ethylene-vinyl acetate copolymer, it have good cohesiveness to glass and metal, the water resistance is good, but the tear strength isn’t good as PVB and SGP. The temperature resistance is better than PVB, but not good as SGP, then mainly used in the photovoltaics field. When there is metal plates in the interlayer part, or the glass will be used outside with interlayer exposed, the EVA is the better choice. But for the curtain wall, EVA interlayer isn’t suggested.

SGP_副本

SGP could be regarded as the modified polymethyl methacrylate, it have good cohesiveness to glass and metal, the water resistance is also good, could be used in high temperature(<82℃). Even the glass broken, the remaining strength is also high, have superior security. SGP is the code for the Ionic membrane from DuPont company is America, it is also called SuperSafeGlas. The remaining strength and water resistance for the SGP laminated glass, makes it suitable which used as the glass floor.


Post time: Jul-27-2022