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Hardness is measured on a scale called PEI (Porcelain Enamel Institute), a laboratory that created the test method that indicates an index of resistance to surface wear in enamelled ceramic plates (exposed in the laboratory to an abrasive load at a certain number of rotations). trying to simulate human trafficking). The PEI scale goes from 1 to 5, where 1 is the lowest hardness and corresponds to plates that do not allow traffic and only serve as wall covering. |
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HARDNESS
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TRAFFIC
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USE
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HARDNESS TRAFFIC USE Number of holes x drill bit (with cooling)
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PEI I
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Ultra light
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Residential and interiors
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20
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PEI II
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Light
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Residential with direct access to the outdoors (kitchens, hallways, halls)
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15
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PEI III
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Medium
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Commercial with moderate foot traffic (small businesses, garages, terraces)
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12-15
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PEI IV
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Moderate
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Commercial with high foot traffic (restaurants, shops, hotels, homes)
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8-10
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PEI V
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Intense
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Commercial and industrial (restaurants, shopping centres, public buildings, airports)
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3-5
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