29.1 Principle Increasing loads are applied in specified steps to a diamond scratching point of defined geometry The resistance to scratching of the decorative laminate sheet under test is expressed as a numerical rating which defines the maximum applied load which does not produce a continuous surface scratch. The test result is verified by visually confirming that the next higher load-step produces a continuous scratch. 29.2 Materials 29.2.1 Contrast medium, e.g, graphite, talcum, or solution of dye in alcohol, to contrast with the colous of the sheet under test. 29.2.2 Supply of cotton fabric 29.3 Apparatus 29.3.1 Scratch testing apparatus, (see Figure 18), consisting of the following parts: 29.3.1.1 Stand, with a device to indicate the horizontal, for example a spirit level 29.3.1.2 Motor driven turntable, able to rotate about a vertical axis without play. The rotational frequency shall be (5 +/- 1) revolutions per minute. 29.3.1.3 Arm, carrying the holder for the diamond, mounted on a ball bearing, with a horizontal axis The height of this axis shall be adjustable so that the arm is exactly horizontal when the scratching point rests on the test specimen 29.3.1.4 Means of applying a known load, with an accuracy of +/- 0.1 N to the scratching point. 29.3.1.5 Hemispherical diamond scratching point, with a point radius of (0,090 ± 0,003) mm and an included angle of (90 ± 1) degree (see Figure 19). (The diamond shall be mounted in the holder with the flat part on the leading side of the shank facing the working direction.) NOTE 1 The crystal axis of the diamond shall be parallel to the longitudinalaisof the diamond holder. The dimensions of the diamond holder are approximate and are for information only. NOTE 2 Diamond Points conforming with these dimensions and profile are available from: Cie Weinz, Industrie Edelstein Fabrik, Postfach 2740, D-55743 Idar-Oberstein, Germany: and through Erichsen GmbH and Co. KG, D-58675 Hemer-Sundwig/Westfallen, Germany NOTE 3 This is an example of a suitable product that is available commercially. This information is given for the convenience of users of this part of ISO 4586 and does not constitute and endorsement by ISO of this product. 29.3.1.6 Clamping disc, to keep the test specimen flat 29.3.2 Viewing enclosure, having a matt black interior and a light source (defined below) located at the top. Its dimensions shall be such that the test specimen is located vertically below the light source and at a distance of 600 mm. An aperture in the front shall allow inspection of the test specimen at various angles from a distance of (400 ± 10) mm. A diagram of a suitable enclosure is shown in Figure 20. The light source consists of a 100 Watt frosted bulb, mounted in a white reflector having ar aperture of approximately 140 mm diameter and producing an illumination of 800 lx to 1000 lx at the specimen surface. 29.3.3 Conditioning chamber, in accordance with ISO 291, with a standard ...
No. Item A grade B grade C grade D grade E grade 01 Grain Regular straight grain, mountain grain Regular straight grain, mountain grain, half straight grain Straight grain, mountain grain, half straight grain Straight grain, mountain grain, messy grain No limited 02 Live knots φ≤8mm, 2pcs, color natural φ≤15mm, 2-5pcs, color natural φ≤60mm, spitting, color closely Allowed, width≤ 1/3 width of flooring Allowed, width≤ 1/3 width of flooring 03 Dead knots Not allowed φ≤5mm, 1-2pcs, spitting, color closely φ≤20mm, 1-3pcs, spitting, color closely φ≤40mm, 2-4pcs, spitting, color closely φ≤60mm, spitting, color closely 04 Pin knots Single spitting, overall color closely Small, spitting, color closely allowed Spitting, color closely allowed Spitting, color closely allowed Spitting, color closely allowed 05 Side knots Not allowed Not allowed Allowed no drop, no cracking, not allowed dead knots Allowed no drop, no cracking, not allowed dead knots Allowed no drop, no cracking, not allowed dead knots 06 Holes Not allowed φ≤1mm, 3-5pcs, spitting, not color changed φ≤1mm, spitting, not color changed φ≤1mm, spitting, not color changed φ≤1mm, spitting, not color changed 07 Black Lines Not allowed Not allowed 1*100mm, 1-3lines, spitting 3*200mm, 3-5lines, spittng 3*200mm, 3-5lines, spittng 08 Pollution if the surface can be sanded allowed, oil not allowed if the surface can be sanded allowed, oil not allowed if the surface can be sanded allowed, oil not allowed if the surface can be sanded allowed, oil not allowed if the surface can be sanded allowed, oil not allowed 09 Splits Not allowed Not allowed 3*300mm, 1-2lines, seams not allowed 5*300mm, 1-2lines, seams not allowed 8*600mm, 1-3lines, seams not allowed 10 End Oxidation Not allowed Not allowed Allowed a slight, but the color closely Allowed color closely, but the width≤1/4 of flooring width, sq.m≤5% Allowed color closely, but the width≤1/4 of flooring width, sq.m≤5% 11 Sub wood Not allowed Allowed a slight Allow only one side, the width≤15% of flooring width Allow only one side, the width≤20% of flooring width Allow only one side, the width≤30% of flooring width 12 color difference Not allowed Allowed a slight Coordination allowed Coordination allowed Coordination allowed 13 Discoloration Not allowed Not allowed Allowed slight natural discoloration, not allowed blue/yellow stained fungus Allowed slight natural discoloration, not allowed blue/yellow stained fungus Allowed slight natural discoloration, not allowed blue/yellow stained fungus 14 Bark Pocket Not allowed Not allowed 2*30mm, 1 line 4*40mm, 3 lines 5*60mm, 3 lines 15 Watermark, spacer mark Not allowed Not allowed Not allowed Not allowed Not allowed 16 Decay Not allowed Not allowed Not allowed Not allowed Not allowed 17 Broken grain Not allowed Not allowed Not allowed Not allowed Not allowed 18 Tabby grain Not allowed Not allowed Allowed st...
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