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MOR vs. DOL – Strengthened Glass Terminology


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What do the terms MOR and DOL Mean?

Strengthened glass is classified by two strength components:


  • MOR – Modulus of Rupture (Bend Strength or Fracture Strength)


    4-point bend test of chemically strengthened glassRefers to surface compression or the flexural or bending strength of the glass substrate. It is a mechanical parameter that helps determine the ability of the glass to resist deformation under load.


    The flexural strength corresponds to the highest stress experienced within the glass at the moment of rupture. In lay terms, the higher the MOR, the more resistant the glass is to bending or breaking. Chemical strengthening or heat tempering both have a positive effect on the MOR of glass.


    MOR testing of glass is done using a destructive 4 point bend testing.


  • DOL – Depth of Layer


    Chemically Strengthened HIE glassRefers to how deep the ion-exchange process has penetrated the surface of the glass substrate, creating a compression layer thereby reducing the introduction of flaws once the glass is incorporated into the end product. In other words, DOL supports glass abrasion and impact resistance in relation to surface defects which may cause premature breakage of the glass.


    Compressive strength is determined using a defraction test to determine Mpa.


    Abrisa Technologies’ High Ion-Exchange (HIE) glass has a DOL capable of >50μm and a compressive strength
    or MOR capable of >900Mpa.


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