Toughening assessment

The effectiveness of the toughening/tempering and heat strengthening process applied to glassware is assessed by our glass specialists for a range of toughened products, including toughened 'safety' glass for architecture, glazing or shower screens, container glass and drinking glassware. Toughening assessments are utilised by clients throughout the glass supply-chain - whether it is to ensure due diligence, for process control or troubleshooting processing issues.

The effectiveness of the toughening/tempering/heat process applied to glassware can be assessed using a variety of techniques, including polariscopic assessment, fragmentation assessments, impact, scratch or centre-punch testing.

Please contact us, or make an enquiry using the form above, if you have any bespoke requirements, require further information, or would like a quote for analysis.

For further information, please see:

Domestic Glasses for On and Off-Trade Toughened Drinking Glasses

Using a combination of visual examination under polarised light and scratch, fragmentation and centre punch impact testing the effectiveness of toughening of domestic glassware and trade glassware, such as toughened ovenware or toughened pint glasses, can be assessed regarding the safety of the glass in the event of accidental or intentional breakage.

Flat Glass for Architecture, Automotive, Glazing and Furniture

Numerous standards exist for toughened or heat strengthened glass for architectural, domestic and construction applications. We are UKAS accredited to carry out fragmentation assessments of flat glass in accordance with the following standards:

  • BS EN 12150-1:2000 - Glass in building. Thermally toughened soda lime silicate safety glass. Definition and description;
  • BS EN 14179-1:2005 - Glass in building. Heat-soaked thermally-toughened soda lime silicate safety glass. Definition and description;
  • BS EN 14321-1:2005 - Glass in building. Thermally toughened alkaline earth silicate safety glass. Definition and description;
  • BS EN 13024-1:2011 - Glass in building. Thermally toughened borosilicate safety glass. Definition and description;
  • BS EN 1863-1:2011 - Glass in building. Heat strengthened soda lime silicate glass. Definition and description;
  • BS EN 14428:2004 - Shower enclosures. Functional requirements and test methods;
  • BS 6206:1981 - Specification for impact performance requirements for flat safety glass and safety plastics for use in buildings;
  • BS 3193:2008 - Specification for thermally toughened glass panels for use in domestic appliances;
  • ANSI Z97.1:2009 - Safety Glazing Materials Used in Buildings - Safety Performance Specifications and Methods of Test.

See also see our initial type testing of glass construction products.

Fragmentation Assessment for Toughened, or Tempered, Glass

The scope of our accreditation includes fragmentation assessments in accordance with Addendum 42: Regulation No. 43 for automotive glazing, and in accordance with BS 3193:2008, Specification for thermally toughened glass panels for use in domestic appliances, for toughened glass panels for domestic appliances.

On-site Assessments

In addition to laboratory based testing, we are also equipped to assess installed toughened glass on-site using a Scattered Light Polariscope (GlasStress SCALP-04), as well as carrying out assessments of roller-wave and other visual distortions. Please see our on-site technical assessment service for further details of the range of on-site support we provide throughout the flat glass supply-chain.


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