Strengthening glass for bullet impact

Abstract EN

Thermal tempering as a hardening technique for glass was investigated to resist bullet impact.

During this process, the glass was heated in a vertical furnace at different temperatures then cooled, firstly by forced air at different times then quenched to room temperature by using an oil.

Stress profile was done to know the optimum condition.

Etching process for glass with Hydrofluoric acid with concentrations of 5% and 10% was conducted to modify fracture strength of glass.

The glass was laminated with acrylic to support the glass impact strength against bullets.

The fracture strength was modified with 377.5% for only tempered glass while it became 390.3% for etched at (10% HF) and tempered at (650οC) glass.