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The actual classification used for Italian regulations for the fire behaviour of materials/component is described in the standard UNIFER PrE10.02.977.3 "Guidelines for fire protection of railway, tramway and guided path vehicles - Part 3 Evaluation of fire behaviour of materials - threshold values".

Similar to the French Standard, the Italian Standard provides the classification of the material/item by "reaction to fire" and "smoke" (combination of smoke emission and toxicity).

Reaction to fire

For the parameter "reaction to fire" (FI parameters) are provided six categories:
  • Class 0 is evaluated by ISO 1182 "non combustibility test",
  • Class1 to Class 5 are determined by the combination the above parameters evaluated with two tests:
    • UNI 8456  "reaction to fire by applying a small flame on both surfaces" and UNI 9174 "reaction to fire of material attacked by flame with radiant heating",
    • UNI 8457 "reaction to fire of material attacked by flame on one surface" and UNI 9174 (where the sample is positioned as on the end use e.g. horizontal supine for floor materials, horizontal prone for ceiling materials or vertical for wall materials).
Smoke parameters

The "smoke" parameter is obtained identically to the French Standard, namely from combination of "smoke emission" and "toxicity index" (F value). The first one is evaluated by NF X 10-702 (Smoke density Chamber) and the second one with NF X 70-100 (toxicity test). There are three acceptable classes from F1 to F3.

For electrical materials smoke emission and smoke toxicity are separately evaluated with NF X 10-702 and IEC EN 50267part 1 and 2.

The classification system is done by a "threshold value" for "reaction to fire" and "smoke" for each listed item described in two summary tables in the standard (one for electrical components the second for all other materials/item