4B指铅笔硬度，国标里有具体规定，用一公斤的力用4B铅笔按角度如果漆膜不破为通过。4B是比较低的指标了。##5B The edges of the cuts are ***y smooth: none of the squares of the lattice is detached 切口边缘完全平滑，格子完全没有剥离 - 4B Detachment of small flakes of the coating at the intersections of the cuts. A crosscut area not significantly greater than 5% is affected. 在格子的十字交界处涂层有轻微的脱落，影 响面积不超过5% 3B The coating has flaked along the edges and/or at the intersections of the cuts. A crosscut area significantly greater than 5%, but not more than 15%, is affected. 涂层沿着格子的边缘或者在交界处脱落，影 响面积介于5%到15%之间 2B The coating has flaked along the edges of the cuts partly or wholly in large ribbons, and/or it has flaked partly or wholly on different parts of the squares. A crosscut area is greater than 15% but no more than 35%, is affected. 涂层沿着边缘部分或