TEST METHODS AND REPORTS NO. test item standard index high-class qualified class test value single item determination 1 appearance quality vestige indistinct indistinct indistinct high-class coatingomit not allowed not allowed no high-class ripples not allowed indistinct no high-class rubbles（V/10mm） not allowed ≤1个/㎡ no high-class flaw（V/3mm） ≤3个/㎡ ≤10个/㎡ no high-class abrasion not allowed ≤100mm/㎡ no high-class scratch not allowed ≤300mm2/㎡ no high-class Total number of abrasion and scratch not allowed ≤4 0 high-class aberration indistinct indistinct indistinct high-class 2 dimen-sions deviation length ±3mm +0.2mm～+2.1mm ok width ±2mm +0.1mm～+1.1mm ok thickness ±0.2mm +0.02mm～+0.04mm ok squareness ≤5mm 1.7mm ok edge unstraightness ≤1mm/m 0.15mm/m ok warpage ≤5mm/m 1.2mm/m ok 3 Coating thickness min≥25μm 29μm(average 30μm) OK 4 Gloss toletance ≤10(gloss＜70＝≤5 (gloss≥70 7.7 (gloss24.4) OK 5 Pencil hardness ≥HB 3H OK 6 Coating flexibility ≤2T 2T OK 7 Coating resistance No lower than class 1 Class 1 OK 8 Impact resistance 50kg·cmno depainting, no crack 50kg·cmno depainting ,no crack OK 9 Grinding ≥5L/μm ≥17.7L/μm OK 10 Boiling water resistance No change No change OK 11 Pullute resistance ≤15% 2.00% OK 12 Acid resistance No change No change OK 13 Alkaline resistance No change No change OK 14 Oil resistance No change No change OK 15 Solvent resistance No change No change OK 16 Scrub resistance No change when≥10000 times No change when10000time OK 17 Face censity specifide±0.5kg/㎡ 5.54kg/㎡ -- 18 Bending strength ≥100Mpa 121MPa OK 19 Benging elastic modulus ≥2.0×104MPa 3.2×104MPa OK 20 Penetrating resistance ≥9.0KN 10.1KN OK 21 Shearing strength ≥28.0MPa 32.0MPa OK 22 180°peel strength ≥7.0N/mm 12.63M/mm OK 23 Temperatrue difference resistance No change No change OK 24 Thermal expansion ≤4.00×10-5℃-1 8.9×10-5℃-1 OK 25 Heat distortion temperature ≥105℃ 105.1℃ OK 26 Resistance salt spray ≤ 2 grade Class 1 OK 27 Artificial weathering Colour differences Degradation of metallic paint films others ≤3.0 ≤ 2 grade 0 grade 1.13 Class 1 Class 0 OK OK OK