PA abrasives:                                                                                                                    

PA abrasives is bayer alumina,which is electrically fused in high temperature,being added with the right quantity of oxidized chromium. Lt is pink.Lts hardness is close to,but toughness higher than that or WA.

Chemical composition:                                                                                                       

Specification	Low chromium			Medium chromium			High chromium
	Al2O3 (%)	Cr2O3 (%)	Na2O (%)	Al2O3 (%)	Cr2O3 (%)	Na2O (%)	Al2O3 (%)	Cr2O3 (%)	Na2O (%)
F12-F80	≥98.50	0.20-0.45	≤0.50	≥98.20	0.45-1.00	≤0.55	≥97.40	1.00-2.00	≤0.55
F90-F150	≥98.50		≤0.50	≥98.20		≤0.60	≥97.00		≤0.60
F180-F220	≥98.50		≤0.50	≥98.80		≤0.70	≥96.50		≤0.70

 Physical property:                                                                                                                        

Basic minerals	Crystal size     μm	True density   g/cm3	Bulk density   g/ cm3	Knoop hardness   kg/mm2
Α-Al2O3	600-2000	≥3.90	1.40-1.91	2200-2300