which glass is safer in a crash?
Grab from the brand
New Toyota Camry
The broken window at the back door was broken by debris.
Don\'t you need safety glass behind?
Doors and windows of cars? --
Dan Butler, Los AlamitosAnswer: The quick answer is that all side and rear windows on passenger cars must be made of tempered glass, not laminated safety glass, according to federal safety rules.
The long-term answer is that it is part of a huge and complex security campaign.
The glass of modern passenger vehicles is about 100 pounds, and glass is an inherent fragile and hazardous material.
For example, broken beer bottles are often used in bar fights.
As early as the 1930 s, automakers developed laminated safety glass to prevent injuries when the windshield broke.
Modern laminated safety glass has two layers of glass and a plastic film in the middle, making it much stronger and not easy to break when hitting.
It helps prevent passengers from flying into the car through windshield and road debris.
Glass is high-
The strength adhesive, which also helps to reinforce the roof in a rollover accident.
Under federal law, all windshields must be made of laminated safety glass.
Laminated safety glass is not required for side and rear windows.
Instead, the manufacturer can use tempered glass, which breaks into small pieces with sharp edges than ordinary glass.
Tempered glass is much stronger than ordinary glass, made by heating and quick cooling during manufacturing.
Toyota spokesman Bill Kwong said the side and rear windows of Camry use tempered glass.
If there is any doubt that the glass has not been broken properly, the pieces can be returned to the dealer for factory analysis, Kwong said.
Tempered glass should reduce the possibility of severe tearing, although a large number of people are still cut by the glass in the accident.
Laminated safety glass is much stronger than tempered glass, so why not use it on all Windows?
The National Highway Traffic Safety Administration has been working on this issue for nearly a decade.
Gerald Donaldson, senior research director, advocate for road and car safety, said that advanced glass windows, either laminated glass, or some new type of material, for side windows, when passengers are deported in a car crash, thousands of people die every year.
Some luxury cars already use laminated safety glass in side windows.
Donaldson predicted that the federal government would eventually ask car coaches to use laminated glass in the first place, earlier this year, after a member of a University baseball team died in a terrible bus crash on the Georgia Highway, the company began moving in that direction.
But on 2002, NHTSA released a final report that refused to advance the new standard authorized laminated glass for all windows of the vehicle.
Richard Van Iderstine, a consultant who was once a top expert at NHTSA in vehicle visibility, said Laminated glass is getting harder and stronger, this means that it will prevent passengers from being driven out of the vehicle in turn and other accidents.
But this may increase the head and neck injuries of passengers wearing seat belts.
Why, according to federal regulators, is it necessary to increase the risk of injuries to people wearing seat belts to help save people who don\'t wear them?
In addition, laminated glass on doors and windows requires a metal frame to reinforce, just like doors and windows of 1960 s.
\"So, there will be a lot of cost to have this window today,\" he said . \".
There are other problems with the stronger side windows.
Ford spokesman Christine Kingley says passengers will be trapped in the car when they are flooded or in a fire.
Drowning in vehicles is almost a rare event.
Nearly 700 people were killed in these two attacks.
According to NHTSA, 2004 vehicles were flooded during 2003 and another 1,900 were injured.
The statistics do not say how many people managed to escape the flooded vehicle.
Passengers can break tempered glass windows with sharp objects when the car drops water, but it is almost impossible to knock out laminated safety glass.
Emergency rescue experts also expressed concern about their ability to extract passengers trapped in vehicles equipped with laminated windows, Kinley added.
Such an argument is controversial.
On 2005, a jury in Zavala County, Texas attacked Ford Motor. with a $28-
Millions of sentences involving the death of two young people in a car crash.
Counsel for the plaintiff argued that Ford knew that laminated safety glass would help prevent pop-ups.
Ford saw it as compliant with all federal regulations but failed.
Kinley said the company solved the case with a reduced amount. *ralph.
Vartabedian @ latimes.