Pink Aluminium Oxide or Ruby Aluminium Oxide is made by aluminium oxide powder , which is electrically fused at high-temperature adding appropriate amount of chromium oxide , etc . It is pink or ruby . Its hardness is similar to white Aluminium Oxide , but its toughness is higher than that of WFA . Our PA and RA have the features of good crystallinity , pure color ,less impurity , well-distributed particle size composition , low magnetic substance content , high bulk density and high toughness . They have good reputation in domestic and overseas .The abrasive tools made by PA or RA have good durability and the workpieces have high smooth finish . It is suitable for precision grinding of the measuring tools , machine tool main spindle , instrument parts ,thread workpieces and sample plate , etc .

Our PA and RA can also be used in coated abrasives . It is mainly used for sanding wood . It is also used for sanding ferrous metal , such as copper , brass , etc . Compared to White Aluminium Oxide , PA and RA are more non - breakable . So , smooth surface is easy to get.