涂膜硬度是表示漆膜机械强度的重要性能之一。其物理意义可理解为漆膜表面对作用其上的、另一个硬度较大的物体所表现的阻力。
简要叙述目前国内外通用的涂膜硬度试验方法及相关仪器的开发状况。
The current film hardness test method in common use at home and abroad is reported briefly, along with the developing of the relevant instrument.
然而PUD存在固含量低、涂膜硬度偏低、耐水性不好等缺点，需要对其进行有效的改性。
However, PUD possess some shortcomings including low solid content, low hardness and not so good chemisty-resistance, it is necessary to modified PUD.
无偏色，隆起，起泡或涂膜脱落；硬度降低值不低于一个铅号码。
No discoloring, swelling, blisters or film loss; Hardness reduced by one lead number maximum.
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