Tempered glass is manufactured with a compressive stress on the two outer surfaces that both increase its strength and cause it to break into many small pieces when broken. Plate glass, lacking that compressive stress, will break both into larger pieces and at lower impact forces.

Is plate glass tempered glass?

Plate glass is usually harder because of the intense heating and a gradual cooling process to make it sturdier. A tempered glass needs to be sandblasted. So, one good way is to look thoroughly at the edges of the glass. Tempered sheets have smooth and even edges because of the extra processing it goes through.

Is tempered glass stronger than plate glass?

Stronger: Rated to withstand surface compression of at least 10,000 psi, tempered glass is about four times stronger than regular glass. This greatly decreases the chance of breaking on impact.