| Test method EN 154 for surface abrasion resistance, which applies to glazed tiles, envisages the performance of a wear test using an instrument which subjects the piece to the effects of a standard abrasive load, at an increasing number of rpm (from 150 to 1500). The method was developed on the basis of the claim that the degree of deterioration of a floor is not determined by the reduction in its thickness, but the visible difference in appearance between the worn surface and the unworn surface, assessed at a defined distance under standard conditions of lighting. It is important to stress that, for the same degree of abrasion, wear is invariably more visible on dark surfaces. For this reason, the PEI value is shown in catalogues as the requirement for the individual article, and not for the series as a whole. The new ISO product standards (Project ISO TC/189) envisage the introduction of a further class of resistance, class PEI V, to which tiles meeting the following conditions at 12,000 rpm will be assigned: - alterations must not be visible at a standard distance.
- the surface subjected to abrasion must pass a cleaning test (with the staining agents chromium green in light oil, iodine in alcohol solution, and olive oil.
chambre d'hotel a Kilkenny This new class, therefore, also takes into account the effects of abrasion on susceptibility to soiling. The introduction of class PEI V fulfills the need to highlight more clearly, in relation to performance, the superior characteristics of ceramic glazes for technical applications developed in recent years. | | PEI I Floor tiles for light duty wear.
| Suggestions for usage: bathrooms and bedrooms in private houses, where soft footwear is used. | | | PEI II Floor tiles for light duty wear.
| Suggestions for usage: bedrooms and bathrooms in private houses, where normal footwear is used. | | | PEI III Floor tiles for medium-heavy duty wear.
| accommodation in SyracuseSuggestions for usage: dining rooms, living rooms, kitchens, entrances, passages in private houses, where normal footwear is used, without external access. | | | PEI IV Floor tiles for heavy duty wear.
| Suggestions for usage: all rooms in private houses and public buildings, where normal footwear is used, excluding dancing halls and compulsory traffic areas. | | | PEI V Floor tiles for heavy duty wear.
| Suggestions for usage: very heavy traffic (commercial areas). | | |
