Product Details

PA abrasives

PA abrasives is electrically fused in high temperature, being added with the right quantity of oxidized chromium. It is pink. Its hardness is close to, but toughness higher than that of WA. The abrasive tools made of it feature excellent durability and high processing cleanness, which are suitable for the precision grinding of the measuring tolls, lathe main shafts, instruments and apparatus parts, threading work pieces and samplers, etc.

Chemical composition of PA abrasives:

grit size range	Low chromium			Medium chromium			High chromium
grit size range	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		≤0.55	≥98.20		≤0.60	≥97.00		≤0.60
F180-F220	≥98.00		≤0.60	≥97.80		≤0.70	≥96.50		≤0.70Physical property

Basic minerals

Crystal size
μm

True density
g/cm3

Bulk density
g/ cm3

Knoop hardness
kg/mm2

α-AL2O3

600-2000

≥3.90

1.40-1.95

2200-2300