Surface Defects Nominal Thickness Length & Width Edge Straightness Surface Wear Resistance Immersion in Boiling Water Gloss Other Mass Increase (2mm ≤ thickness < 5mm) Mass Increase (thickness ≥ 5mm) Mass Increase (2mm ≤ thickness < 5mm) Mass Increase (thickness ≥ 5mm) Resistance to Water Vapour Gloss Other Resistance to Wet Conditions EN438:2005-2-15 Appearance Mass Increase (2mm ≤ thickness < 5mm) Mass Increase (thickness ≥ 5mm) Gloss Other Dimensional Stability Longitudinal (2mm ≤ thickness < 5mm) (Thickness ≥ 5mm) Transverse (2mm ≤ thickness < 5mm) (Thickness ≥ 5mm) Resistance to Climatic Shock Appearance Flexural Strength Index Flexural Modulus Index Impact Resistance (Small Ball) Impact Resistance (Large Ball) EN438:2005-2-21 Height of Fall (2mm ≤ thickness < 6mm) Height of Fall (thickness ≥ 5mm) Diameter of Imprint Scratch Resistance Gloss Other Stain Resistance Light Fastness Resistance to Artificial Weathering Grey Scale Class Grey Scale Resistance to Cigarette Burns Postforming Radius Fire Rating (4mm ≤ thickness < 6mm) (thickness ≥ 6mm) EN438 Class Definitions - Class 5 No visible change Class 2 Marked loss of gloss and or colour Class 4 Slight loss of gloss and or colour Class 1 Blisters and or delamination Class 3 Moderate loss of gloss and or colour Formica® Products technical properties