Page 92 - QRedition5.0 062021

Quality Requirements Edition 5.0 European Enamel Association

7.27.4 Remarks

The thickness of the sheet material and the construction must ensure that distortion cannot be imposed through manual force. This can be achieved by installing stiffeners such

as flanged rims or otherwise, as determined in the design.

Articles must be equipped with sufficient protection against corrosion at the back side.

Signs may not deviate more than 1 % in flatness with respect to the longest side and diagonal of the article, and must meet the requirements of the manufacturer with regard
to sheet thickness, sheet quality, construction and technical design of the article. The inspection frequency for this additional requirement during production is 1 % of the material,

but at least 1 x per month. Signs are measured in the position in which they will be installed.

Possible firing marks at the back side of the non-glued panels must be retouched in order to prevent corrosion. The inspection frequency for this additional requirement during
production is at least 1 x a day.

Appearance (colour, structure and brightness of the products) must be equal to the appearance of an enamelled sample that has been approved of by the interested
partners. The inspection frequency for this additional requirement during production is 100 % of the material.

The enamelled surface shall be visually examined either in natural light or in artificial daylight D 65 (see EN-ISO-105-J03). The surface shall be examined from a minimum distance
of 1.5 m, or at the distance at which the fixed panel would normally be viewed, whichever is the greater.

In certain conditions and in agreement with the manufacturer signs and advertising boards for interior use may be produced with lower resistance against citric acid.

Graffiti has to be removed with a sponge or cloth and an appropriate solvent. After eight days of drying at ambient temperature, ink and varnish colours should also be washable without
visible traces (does not apply for precious metal coatings).

The quality requirements and testing regulations also apply for silk-screened-art enameled articles. However they are not valid for artistically free designed enameled articles (for the
latter, special arrangements can be made).

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