NFF31-112:1994-12 Railway rolling stock--Protection in relation to graffiti-Tests procedures and methods of valuation, behaviour of materials and products of expulsion.

General principle

The evaluation procedures must include the following criteria:

material or coating;
graffiti application product;
graffiti removal product.

The behaviour of materials is evaluated on the basis of the graffiti and removal products defined by the client railway company.
The results of the graffiti removal are evaluated after several “graffiti application – removal” cycles on the basis of the following criteria:
aggressivity (visual aspect);
effectiveness (colorimetry);
safety labels on removal products (according to the laws in force).

NFT30-053: Paints-Determining resistance to liquids

NFX08-012: Colours – Colorimetric characteristics of coloured samples – Measuring devices and methods.

NFX08-014: Colours – Colorimetric deviations and tolerances – Formulae for colour differences between CI LUV and CIE LAB.

“G” grading of the material

“G” grading includes the health and safety aspects of the removal products, in accordance with current legislation. Otherwise, the material will be deemed “UNCLEANABLE”.

G 0:   material is "CLEANABLE" with water or dry;
G 1:   material is “CLEANABLE" using a removal product that is not labelled with the danger symbol;
G 2:   material is “CLEANABLE” using a removal product that is labelled “Xi” irritant and/or “F” inflammable.
G 3:   material is “CLEANABLE” using a removal product that is labelled “Xn” harmful and/or “C” corrosive.
G 4 :   material is “CLEANABLE" using a removal product that is labelled “T” toxic;
NN:  material is “UNCLEANABLE”.

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