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| Physiochemical Properties (理化) | 1. Dry bonding strength: 1.55 N/mm² (Grade II); Wet bonding strength: 1.35 N/mm² (Grade II); Impregnation peeling: 11.1% (Grade II) | GB/T 17657-2013: Grade II (≥1.6 N/mm² dry bonding, ≥1.4 N/mm² wet bonding, ≤11% impregnation peeling); Client specs: ≥1.7 N/mm² dry bonding, ≥1.5 N/mm² wet bonding (US market), ≤10% impregnation peeling (EU market) | Test per GB/T 17657-2013; Calculate average of 3 specimens for bonding strength; 24h water immersion test for wet bonding; 63°C water immersion test for impregnation peeling, check delamination area |
| 2. MOE: 9.4 GPa (Grade II); Bending strength: 23.5 MPa (Grade II); Moisture content: 14.1% (Grade II) | GB/T 17657-2013: Grade II (≥9.5 GPa MOE, ≥24 MPa bending strength, 8%-14% moisture content); Client specs: ≥10 GPa MOE (structural use), ≥25 MPa bending strength (high-load), 8%-12% moisture content (export) | Three-point bending test (span/thickness=17:1) for MOE and bending strength; Oven-drying method for moisture content, test 3 specimens per batch |
| Dimensional Tolerance (规格) | 1. Thickness tolerance: +0.6mm (≤6mm, Grade II), +1.1mm (>6mm, Grade II) | GB/T 9846-2015: Grade II (±0.5mm for ≤6mm, ±1.0mm for >6mm); Client specs: ±0.4mm (≤6mm), ±0.8mm (>6mm, precision furniture) | Use 0.01mm precision micrometer; Test 5 points per sheet; Calculate average of measurements for thickness confirmation |
| 2. Length/width: +4.1mm (≤1220mm); Squareness: 1.1mm/m; Flatness: 31mm (≥1220×1830mm) | GB/T 9846-2015: ±3mm length/width (≤1220mm), ≤1mm/m squareness, ≤30mm flatness; Client specs: ±2mm length/width, ≤0.8mm/m squareness, ≤25mm flatness (high-end projects) | 1mm precision steel tape to measure 4 corners (length/width); Check diagonal difference for squareness; 1m straightedge + feeler gauge for flatness measurement |
| Manufacturing Process (工艺) | 1. Core gap width: 1.1mm (Grade II); Veneer thickness variation: 0.11mm (face veneer); Delamination area: 1.1% | GB/T 9846-2015: Grade II (≤1mm core gap, ≤0.1mm veneer thickness variation, ≤1% delamination area); Client specs: Prohibited core gap (Grade I), ≤0.08mm veneer thickness variation (Grade I), ≤0.8% delamination area (export) | Visual inspection + backlight for core gap (check movement under pressure); Thickness gauge to test 10 points per sheet (veneer); Tap test + ruler to measure delaminated area |
| 2. Over-sanding: 0.11mm (Grade II); Under-sanding: Roughness Ra 0.81μm (Grade II); Edge chipping: 2.1mm (length) | GB/T 9846-2015: Grade II (≤0.1mm over-sanding, Ra ≤0.8μm under-sanding, ≤2mm edge chipping); Client specs: ≤0.08mm over-sanding (Grade I), Ra ≤0.6μm under-sanding (Grade I), ≤1.5mm edge chipping (Grade I) | Compare to standard thickness for over-sanding (check for bare core); Surface roughness tester for under-sanding; Edge inspection + caliper to measure chipping depth/length |
