相对硬度 meaning in Chinese

relative hardness
relative stiffness

Test method for relative rigidity of poly vinyl chloride siding
三氯乙烯相对硬度测定方法
Standard test method for relative rigidity of poly vinyl chloride siding
聚氯乙烯挡板相对硬度的标准试验方法
Usually show there are two kinds of methods in the hardness : to the hardness , or call and rub the hardness , it is a kind of scratch hardness
通常表示硬度有两种方法：相对硬度，或称摩氏硬度，是一种刻划硬度。