A fireproof windows are a type of safety device used to block the spread of flames and smoke in buildings, while also maintaining structural integrity and thermal insulation for a certain period of time. The fire resistance limit standard is not directly measured in terms of temperature value, but is defined in terms of the length of time it can withstand flame impact and remain intact.
According to the Chinese National Standard GB 12955-2008 "Fireproof Windows", Grade A fireproof windows must meet the fire resistance integrity of 1More than 5 hours. In other words, Grade A fireproof windows can remain ineffective for at least 90 minutes after being subjected to high-temperature flames, during which the windows must not be significantly deformed, broken or collapsed, so as to ensure the personal safety of the area where they are located and give sufficient time to escape.
Corresponding to the experimental environment, the fire window is subjected to a high temperature of at least 1000°C during the test, but the specific temperature of the fire resistance limit depends on the quality of the fire window design, materials and installation. Because Class A fire-rated windows are expected to have excellent fire-resistant and thermal insulation properties, they are usually made of special refractory materials such as tempered glass, flame-retardant seals, and treated metal frames.
Grade A fire windows must not only resist the direct spread of flames, but also limit the transfer of heat through the windows to prevent the spread of fire to adjacent areas. Such products need to pass the strict test of the National Fire Product Quality Inspection Center, and obtain the corresponding certificate of conformity and quality mark before they can be put on the market.
When purchasing fire-rated windows, users should not only pay attention to their fire resistance limit time, but also understand the thermal insulation performance indicators of different levels of fire-rated windows to ensure that they match the fire risk assessment of the building design and the relevant fire safety codes. Typically, Class A fire windows are widely used in high-rise buildings, crowded public places, and special areas that require a higher fire rating.
In summary, the fire resistance limit of Class A fire windows is designed to prove that they can be used as a solid barrier against the spread of fire in critical times through rigorous condition testing and simulation of actual fire scenarios. Professionally designed and manufactured, Grade A fireproof windows provide an important security guarantee for the building space.