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Glass marking: Product tracing and type designation

A product that is marketed nowadays must normally provide proof of a continuous history: The finishing industry and consumers shall be able to trace the source of the product. This applies also to glass.

However, glass is not only marked for the purpose of traceability. Experts can determine the type and use of the glass based on the marking.

Until recently, codes were imprinted to the glass or applied to it with the mercury vapour method. However, this has shown not to be very durable. So-called laser fracking, generating minute optical faults in the glass matter – appearing eventually as codes, are much more effective and durable.

Float glass, amongst others, is marked in this manner. Laser technology now also allows glass to be marked on the surface. In this manner, quality seals or QR codes can be integrated in the glass at inconspicuous locations.

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