Thin, strong, efficient: CONTURAN® Tough


At a Glance

CONTURAN® Tough – The only anti-reflective glass optimized for chemical tempering

CONTURAN® Tough is based on a special further development of SCHOTT’s anti-reflective technology with a focus on chemical tempering. For instance, only CONTURAN® Tough allows for the ion exchange necessary for the chemical tempering process through the anti-reflective coatings and thus becomes the world’s only anti-reflective glass that can be chemically tempered. In addition, CONTURAN® Tough offers the well-known, outstanding optical properties of the CONTURAN® product group as always as a single-sided or double-sided coated substrate.

CONTURAN® Tough thus also offers all of the advantages of anti-reflective coatings on very thin and thus very light and highly transparent substrates. In other words, all of the advantages for cover glasses for use in mobile applications in industrial and medical technology and all of the solutions that require the highest transmission as in the area of lighting.

  • reduction of annoying reflections by more than 90%
  • chemical tempering through the anti-reflective layer and therefore a greatly simplified process chain
  • high transmission and increased contrast
  • high abrasion resistance and chemical resistance prolong the life span, which means CONTURAN® is very resistant and easy to clean
  • invisible and color neutral to allow for perfect visibility
  • can be offered in any customer-specific form or assembly

Watch our video: SCHOTT CONTURAN®


... Transparency ...
  • even better transmission properties due to the possibility of using thinner substrates
  • less than 0.5% residual reflection on each side
  • increased contrast due to reduced reflections

... Durability...
  • high abrasion resistance for a longer service life of the respective object
  • in addition, increased mechanical and thermal resistance due to chemical tempering
  • increased scratch resistance of the glass thanks to chemical tempering
... Quality ...
  • thin and light substrates due to chemical tempering that are still highly durable
  • invisible and color neutral to allow for perfect visibility
  • high surface planarity despite increased load bearing capacity
  • can be combined with the easy-to-clean coating DARO
  • CONTURAN® Tough meets the recommendations of the standard EN12337

Area of Applications

Information displays in mobile applications
  • customer-specific cover glasses for digital information displays, displays for use in industrial and medical technology in mobile applications

Lighting industry
  • particularly thin and highly transparent cover glasses for illuminants or faceplates with increased mechanical and thermal loads

Technical Information

CONTURAN® Tough of course offers the well-known properties of the CONTURAN® standard versions supplemented by a specially adapted layer structure for the optimization of chemical tempering, which results in a significantly better process sequence for both the processor and the customer.

Complex process chain: chemical tempering is performed first, then a standard anti-reflective coating is applied

Up until now, chemical tempering has been performed before the anti-reflection coating is applied because conventional anti-reflective coatings would prevent the ion exchange necessary for tempering. Coating at the end of the process chain has made complex single piece manufacturing necessary in applying the anti-reflective coating, however, and is an extremely inefficient process.

Efficient process chain: CONTURAN® receives chemical tempering

CONTURAN® is a different story: This anti-reflective glass from SCHOTT is the only one of its kind that allows for chemical tempering through the anti-reflective layer. Compared to standard procedures, this results in clear improvements in the process flow.

For instance, CONTURAN® allows for the exchange of ions through the anti-reflective coating and thus greatly simplifies the process chain. For example, large-format glasses can be coated first and then further processed – a much more efficient process comparable to the processing of uncoated glass.
Complex Process Chain
Efficient Process Chain

What happens during chemical tempering?

The hardness of a glass can be increased by performing a special treatment in a salt bath. Smaller ions from the glass surface are replaced by larger ones from the salt bath by way of ion exchange. This creates compressive stresses in the surface, which increase the strength of the glass. This process is known as chemical tempering or chemical hardening and is particularly well suited for thin glasses with a thickness of less than 3.2 mm, which can no longer be thermally tempered without difficulty.
CONTURAN® Tough - chemical toughening before
CONTURAN® Tough - chemical toughening after
During the ion exchange in glass surfaces, smaller sodium ions are usually replaced by larger potassium ions from the salt bath. The compressive stresses increase as a result and delays cracking in the glass.

Technical values for chemical tempering

Technical values for chemical tempering
Compressive stress 350 MPa possible
Depth of penetration 9 µm

Individual case values depend on the process parameters chosen. 
Product specification
available glass thicknesses 1.1 mm – 4 mm
maximum dimensions 1,220 x 1,770 mm
light transmission > 98%
available as CONTURAN® Standard


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