Guaranteed specifications:
Appearance	Off-White Powder	Light Yellow Powder	Yellow Powder
Al2O3	30-31%	30-31%	28-31%
Basicity	40-50%	50-80%	60-95%
Water insoluble materials	0.3% max	0.3% max	1.0% max
PH value	3.5-5.0	3.5-5.0	3.5-5.0
Pb	30ppm max	30ppm max	30ppm max
As	6ppm max	6ppm max	6ppm max
Cd	6ppm max	6ppm max	6ppm max
Cr+6	15ppm max	15ppm max	15ppm max
Hg	0.3ppm max	0.3ppm max	0.3ppm max