Semi-tempered
glass, also known as heat strengthened glass, is a kind of glass between
ordinary float glass and tempered glass. It has some advantages of tempered
glass, having strength 2 times higher than regular float glass while avoiding
the disadvantages of tempered glass, such as unsatisfactory flatness and easy
to explode.
Semi-tempered
glass is not considered as safety glass as it will result in larger fragments
and cracks in radial pattern when it’s broken. Although most of fragment will
be free of sharp edges, it could still cause injury. Therefore, semi-tempered
glass is not suitable for sunroof or places with high possibility of being
bumped into.