"Inertial unlatching", which takes place when a seat belt becomes unlatched during a collision. Buckles without a "lock-for-the-latch" design are more susceptible to inertial unlatching, in which the latch plate pulls out of the seat belt's buckle. In 1982, a patent by General Motors said that a properly designed latch should be physically blocked in the latched position to prevent unlatching by inertia forces acting on the vehicle body. Despite these warnings, anti-inertial unlatching features are still not used in all seat belt buckles in new cars and the United States government has largely ignored inertial unlatching in its safety guidelines.

 "False latching", which occurs when a seat belt buckle appears to be closed, but is not. If an individual is not properly restrained and instead are falsely latched, they may be at risk for ejection from a vehicle. A seat belt is considered to be falsely latched if it pulls free at less than five pounds of pull. False latching can cause passenger ejection from a moving vehicle or serious injury when the passenger collides with the interior of the car.

Seat belt durability is key. This includes the material and weaving of the belt itself in addition to seat belts that have too much slack and thus load too quickly, disabling the belt's protective webbing. Faulty seat belt retractors are also implicated in seat belt durability accidents.

Company resources：PTFE open meshes, Seamless belts, PTFE sheet
Read more：http://www.ptfeglassfiber.com/news/