The composite fireproof glass can be kept from cracking within a certain time, and the fragments will not fall after cracking, which can block the flame and prevent the flame from spreading. If flame retardants are added to the gel at the same time, flame retardant gas can be released at high temperature, and the composite fire-resistant glass will have the function of flame retardant and extinguishing simultaneously. When a fire occurs, the composite fireproof glass in contact with the fire first meets the fire and bursts after a few minutes, and the intermediate interlayer material gradually becomes a layer of bubble like material to form a thick and dense bubble like fire-resistant insulation layer. The glass fragments in contact with the fire always stick to the bubble like layer until they melt, The glass on the back fire surface of composite fireproof glass is always protected and shielded. In the fire test, the average temperature rise of the back fire surface of the composite fire-proof glass shall not exceed 140 ℃.

Fire rating of composite fireproof glass

Fireproof glass is a kind of special glass that can maintain its integrity and heat insulation in the specified fire resistance test, in which composite fireproof glass is widely used.

Composite fireproof glass belongs to type a fireproof glass: class a I-class a IV, 0.5h-1.5h, thickness 18mm-34mm. It is a heat insulating fireproof glass composed of two or more layers of glass and transparent fireproof flame retardant.

When the composite fireproof glass meets fire, the middle adhesive layer will expand and foam quickly to form a dense and honeycomb thermal insulation layer to prevent the spread of flame and heat transfer. It can be widely used in public buildings and places with thermal insulation requirements for glass.

Fireproof glass is a kind of special glass that can maintain its integrity in the specified fire resistance test. It is mainly used to replace non fireproof glass in fireproof doors, fireproof windows and fireproof partitions. Fireproof glass is divided into three categories according to product types:

Class A - fireproof glass meeting the requirements of fire integrity, fire resistance and heat insulation at the same time. It includes composite fire-proof glass and cast-in-place fire-proof glass. This kind of glass has the properties of light transmission, fire prevention, sound insulation and impact resistance. It is suitable for building decorative steel wood fire doors, windows, upper lighting, partition walls, daylighting roofs, smoke retaining vertical walls, perspective floors and other building components that need to be transparent and fire-proof.

Class B - fireproof glass meeting the requirements of fire integrity and thermal radiation strength at the same time. This kind of fireproof glass is mostly composite fireproof glass, which has the characteristics of light transmission, fire prevention and smoke separation.

Class C - single piece fireproof glass that only meets the fire integrity requirements. This kind of glass has the characteristics of light transmission, fire prevention, smoke separation and high strength. It is applicable to fireproof glass partition wall, fireproof window, outdoor curtain wall, etc. without thermal insulation requirements.

High strength monolithic fireproof glass is made by Comprehensively Strengthening flat glass. The product can not only be used as a single piece, but also be made into laminated glass, insulating glass, coated glass, etc. it has the functions of toughened glass and grouting composite fireproof glass.

Fireproof principle of composite fireproof glass:

In case of fire, the composite fire-proof glass facing the fire surface will burst quickly in case of high temperature, and its fire-proof rubber interlayer will foam and expand about ten times successively to form a hard milky white foam fire-proof rubber plate, which can effectively block the flame and isolate high temperature and harmful gases. Finished products can be grinded, perforated and cut with changed ruler. When applicable to external windows and curtain walls, the design scheme shall consider the combination of composite fireproof glass and PVB laminated glass. Scope of application: fire doors and windows, fire compartments and fire partition walls in important parts of buildings, rooms, corridors and passages.

It is often seen in China that 60 minute or 90 minute composite fireproof glass is directly installed on aluminum window or aluminum frame. The aluminum material has a low softening point at high temperature, i.e. softening at more than 600 degrees, while the glass temperature has reached 925 ℃ in 60 minutes and 718 ℃ in 15 minutes. Therefore, the final result of this combination can only be that the composite fireproof glass system fails to ensure the fire integrity within the fire protection time limit; The material of steel profile should also be considered.