Anisotropy + White Haze Scanner

Measure and minimize Anisotropies in façade glazings and rework White Haze

When it comes to the visual quality of tempered and heat-treated glass, anisotropy is a top concern among producers and architects or end users. Anisotropies, also known as iridescence, present as dark circles, spots or stripes in the glass that are visible in polarized light, from certain angles or through polarized sunglasses. The visual effect is caused by different tensions in the glass, mostly resulting from the tempering process.

As option in addition to measuring anisotropies, the scanner can detect white haze on the glass, which can be caused by dust, rollers or other factors in the furnace. The haze detection allows operators to know exactly where they must rework the glass to ensure a clean surface before sending it to the next processing stage or the customer.


The Anisotropy Scanner is measuring with polarized light in transmission and is applicable for all tempered and heat strengthened float based glasses even with temperable standard coatings, for sizes up to 3.3 x 6m (optional up to 18m) and glass thicknesses up to 20 mm (optional more). The Anisotropy Scanner is measuring without causing a production delay up to a production speed of 25 m/min. Anisotropies were visualized as batch coming from the oven bed. Each single glass on the batch is measured and the correcponding anisotropy value is displayed and documented. So there is a proof that the minimal target value was achieved at each glass.


  • Measurement of Anisotropies
  • White Haze channel as option
  • Avoidance of claims
  • Clear objectives negotiated with the customer by samples or mockups
  • Immediate result, whether anisotropy target value was achieved
  • Control without production delay while checking 100%
  • Quick payback due to avoidance of replacements


White Haze

The „US Glass Magazine“ has awarded the Anisotropy Scanner to be the “Most Innovative Machine or Equipment 2017”.

Examples displaying Anisotropy measurements and an image of „White Haze“:

Strong White Haze detected

Smooth White Haze detected

Customer reports

Precise Anisotropy measurement

The COO of BGT, Mr. Klaus Wittmann, said about the Anisotropy Scanner:

  • Now it is possible to optimize the furnace parameters. That finally gives us chance to reach the process stability and delivery quality we always wanted.
  • We save man power we earlier needed for the manual documentation. Today the scanner generates the reports.
  • We avoid claims and expensive additional deliveries.
  • Our market position is strengthened.



    Brochure Anisotropy Scanner

    Anisotropy Scanner_Flyer_EN

    Brochure White Haze Scanner

    White Haze Scanner_Flyer_EN

    Viprotron Brochure

    Inspection Systems_flyer_EN