Chemical Tempering

Both chemical and heat tempering are used to strengthen glass, but they use different processes and have different advantages and disadvantages.

Chemical Tempering

Glass is immersed in a potassium salt bath, which causes an exchange of ions on the surface of the glass. This creates a layer of compression on the surface, which makes the glass stronger.   

Advantages:

  • Can be used to strengthen thin glass
  • Better scratch resistance
  • Does not distort the glass
  • Can be used to strengthen complex shapes

Disadvantages:

  • More expensive than heat tempering
  • Not as strong as heat-tempered glass
  • Does not create safety glass

Heat Tempering

Glass is heated to a high temperature and then rapidly cooled. This creates a layer of compression on the surface of the glass, which makes it stronger.   

Advantages:

  • Less expensive than chemical tempering
  • Creates safety glass
  • Stronger than chemically tempered glass

Disadvantages:

  • Can distort the glass
  • Not suitable for thin glass or complex shapes

Summary

Here is a table that summarizes the key differences between chemical and heat tempering:

FeatureChemical TemperingHeat Tempering
ProcessIon exchangeHeating and rapid cooling
CostMore expensiveLess expensive
StrengthNot as strongStronger
Safety GlassNoYes
DistortionNo distortionCan cause distortion
Thin GlassSuitableNot as suitable
Complex ShapesSuitableNot as suitable

I would also like to add that neither chemical tempering nor heat tempering is a perfect solution. Both processes have their own advantages and disadvantages. It is important to weigh these factors carefully before making a decision.

For more information, please contact +358 400 633 744 / Kai Tammela / kai@lasimyynti.fi