Automakers begin using laminate safety trash , also sleep with as auto glass , for motorcar windshields in 1927 . To make laminated refuge glass , the maker sandwiches a thin layer of flexible well-defined plastic film called polyvinyl butyral ( PVB ) between two or more pieces ofglass . The plastic moving-picture show holds the glass in place when the glass breaks , helping to diminish injury from fly looking glass . The film also can stretch , yet the looking glass still sticks to it . It is also quite difficult to penetrate laminate safety glass , compared to normal window pane glass . The " sandwich with some give " that laminate safety glass is made of also helps bear the occupants in a vehicle ! depository financial institution use a multiple - layer laminatedglassto helper stop bullet .
Laminated safety glass has two other additional benefits :
Laminated safety shabu is also used in :
Laminated prophylactic glass resists falling out of its frame during anearthquakeor atornado .
Tempered safety glass is a single art object of glass that gets tempered using a mental process that heats , then quickly cools , the glass to harden it . The tempering cognitive process increase the intensity of the glass to five to 10 time that of unhardened glass . anneal safety meth breaking differently than regular clear glass . When tempered safety glass is come upon it does not break into sharp jaggy pieces of shrapnel - like spyglass as normal window pane or mirrors do . Instead , it break into little pebble - like piece , without sharp edges . It is used in the side and rearward window of automobiles . Eyewear uses tempered glassful that has been normalize using a chemical substance outgrowth .
Tempered rubber glass is also used in :
you may easily spot tempered safety glass in an automobile rearward windows on a sunny mean solar day if you are wearing polarise sunglasses . Tilt your head 90 degree or so and you will see a symmetrical figure in the glass created during its tempering process .
