1. Strip defects caused by under-pickling
Minor defects: slight, like a pattern
Moderate: A distinct band with an area < 1/10 of the total area
Severe: obvious band, its area is < 1/5 of the total area
2. Strip defects caused by over-pickling
Slight: the surface is slightly dark
Moderate: The dark color on the surface is obvious, the dark color distribution is banded, and the dark color area is less than 1/10 of the total area
Severe: the surface dark color is more obvious, the dark color area < total area 1 < 5
3. Defect: Parking spot
Minor: parking time <10min, the surface is slightly yellow
Moderate: 10min≦parking time<20min, with obvious macular on the surface
Serious: parking time ≧20min, the entire board is black
4. Edge Crack
Minor: edge crack length < 1℅
Medium: edge crack length < 5℅
Severe: edge crack length <10℅
5. Defects: Wrinkles
Slight: <10mm long from the edge, slightly rough to the touch
Medium: <15mm long from the edge, rough to the touch
Serious: <20mm long from the edge, rough to the touch
6. Strip defects caused by scratches
Slight: discontinuous, <50mm, thinner than a pencil lead, no roughness
Medium: discontinuous, >50mm, thicker than a pencil lead, ≤1/4 thickness tolerance with slight rough touch
Serious: continuous or bundled, thicker than a pencil lead, depth ≤ 1/2 thickness tolerance
7. Foreign body pressing
Minor defects: small, non-rough-feeling defects
Moderate defects: very shallow, small grains
Serious defects: deep, intermittent
8. Defect: Porosity
Minor: depth < 1/10 plate thickness
Medium: depth < 1/8 plate thickness
Severe: depth < 1/5 plate thickness
9. Defect: Iron oxide scale pressed in
Slight: no feeling to touch, extremely small size
Medium: Slightly rough to the touch, light, and can be worn off
Severe: The touch has obvious roughness, and deepening, and it is not easy to wear off
10. Strip defects caused by surface inclusions
Minor defects: particle size, only visible by careful observation
Medium defect: the impurity particles are larger and more obvious, and the distribution area on the board surface is less than 1/10 of the total area
Serious defects: obvious continuous band distribution, area < 1/5 of the total area
