Tampered glass, marked as ESG, is referred to as safe glass. Its distinguishing feature is the fact that it breaks into small pieces with blunt edges, which minimises the risk of injuries and more serious bodily harms.  However, the predominant objective for glass tempering is to increase its strength, which in practice means:

  • Increased tensile strength – tempering secures event seven-fold higher tensile strength  compared to ordinary glass
  • Increased resistance to thermal stresses – tempered glass is resistant to the temperature differences of approximately 200 degrees C, while ordinary glass can hold the differences of 30 degrees C.

Tempering is based on heating the glass to very high temperature (approximately 620-680 degrees C) and its subsequent immediate cooling  with compressed air stream. Consequently, internal structure of glass changes together with its properties – increased strength and obtainigt he features of safe glass.

Tempered glass is widely applied nowadays as:

  • Monolithic glass: furniture glass, shower cubicles, doors, partition walls, wall covering, glazing, table tops, glass shelves
  • Used in laminates and subject to additional technological processes: floors, platforms and non-slip stairs, balustrades with UV print or painted,
  • Used in laminates: roofing, balustrades and railings, safety barriers, lift windows, floors and ceilings, roofs

Tempered glass produced by Sell-Glass is marked with permanent CE marking – we certify the product conformance with the norm PN-EN 12150.


Minimum glass size: 250 x 100 mm
Maximum glass size:  4400 x 2200 mm
Glass thickness range: 4-19 mm