(2017-10-18) The role of sealant-Car front windshield and other automotive glass installation
The role of sealant-Car front windshield and other automotive glass installation (2017-10-18)
In the automotive glass installation system, the most critical item is glass paste glue, it bond windshield and car frame firmly together. In addition to basic functions such as protection against water leakage and vibration, it also needs to ensure that important safety features are achieved during vehicle accidents, especially when the air bag explodes, including preventing glass from flying off, supporting the air bag, securing the safety body, and ensuring that the antenna accepts Effect and so on.
Function 1: to prevent glass fly off
According to a 1985 study by the National Highway Traffic Safety Administration (NHTSA), a glass-bonded installation that meets the standard (FMVSS 212) can achieve a 50% reduction in glass fly-off at 48km / h forward impact. While substandard installation at 48km / h collision, 15% of the front occupants (without airbags and no seat belts) will occur in whole or in part from the windshield fly accident, and of which one-third will lead to Death (simply because of flying out) and other serious consequences.
Therefore, the NHTSA specifies the safety standard FMVSS 212, which requires a frontal impact of 48 km / h without airbags and seat belts. The windshield bonding must be able to withstand the impact of the front occupant, and the adhesive detachment does not Allow more than 25%.
Function two: support airbag work
The correct installation of the windshield plays an important role in the protection of the airbag during the collision. This is because in the event of an accident, the airbag is detonated to instantaneously expand to its maximum volume and then retracted. Personnel reach the airbag and the airbag rushes to the glass, and personnel should not move forward more than 5 inches (12.5cm). Glass bonding system not only to withstand their own inertia, but also to withstand the double impact of the airbag and front passenger. If the glass fly off, balloon valgus, balloon protection is greatly reduced. FMVSS 208, a safety standard issued by the National High Speed Traffic Committee, stipulates that at 48km / h, double airbags and front double dummy are installed and the air bags explode and the impact windshield glass will not fly off.
Function three: to consolidate the body safety
In the event of a collision, in addition to airbags, seat belts and other protection, to ensure that occupants of the living space is also crucial. For this reason, in addition to higher strength requirements, the glass bonding system introduces a high rigidity requirement - that is, unit deformation requires more pulling force, so that the windscreen integrates with the entire bodywork to effectively combat the impact upon impact.
European NCAP has developed a higher standard of collision, the speed increased to 64km / h, at the same time by a complete positive collision into a 40% overlapping positive collision. With double airbags and double dummy, requires strong glass paste, A column is not deformed, driving space to ensure that the door can be opened and so on. It is reported that the world's first through the European NCAP crash test glass glue manufacturer is Henkel, Germany, at present, of the 10 domestic cars, there are 6 original use of Henkel glass installation system.
Function four: to ensure that the antenna receiving effect
As more and more models have pasted electronic devices on the glass, such as built-in antenna, rain sensor, GPS navigation, etc., this requires complete insulation of the glass and the body, otherwise the receiving effect will be seriously affected. In other words, glass adhesive paste with a low enough to have low conductivity (LC - low conductivity), and then to ensure that glass radios, wipers and other electronic sensors to ensure the normal work.
Due to the relative chaos in the management of the domestic automobile after-sales service market, there is a lack of corresponding safety standards for the installation of windshield glass. As a result, the glass glue used in the glass repair market is extremely unsafe. Many gums have a sealing effect and low strength, most of which is used for building glue to get to the car. Many auto glass shop, repair shop or even "4S" shop, are not using the safety certification after-sale plastic glass, to the owner caused a great security risk.
Aofeng group developed a series of polyurethane automotive sealants, covering from the car front windshield, car body glass, car body paste with the sealant, excellent performance, quality and stability. Access to many users at home and abroad with good reputation.
