Black silicon carbide product quality grading standards

Category	serial number	project	particle size range	Qualified product	First grade	Premium product
Particle size composition	1	Basic grain	F12-F90	Must comply with the provisions of the GB2481.1-1998 standard	Qualified product index plus 6	Qualified product index plus 10
	1	Basic grain	F100-F220		Qualified product index plus 5	Qualified product index plus 8
	2	fine grain	F12-F150		Qualified product index minus 1	Same product
Chemical composition	3	silicon carbide	F12-F90	≥98.50	≥98.70	≥99.00
			F100-F180	≥98.00	≥98.30	≥98.50
			F220	≥97.00	≥97.50	≥98.00
	4	Fluorocarbon	F12-F90	≤0.20	≤0.15	≤0.10
	4	Fluorocarbon	F100-F220	≤0.30	≤0.20	≤0.15
	5	_{Ferric oxide}	F12-F90	≤0.60	≤0.35	≤0.15
			F100-F180	≤0.80	≤0.40	≤0.20
			F220	≤1.20	≤0.70	≤0.40
magnetic substance	6	Magnetize	F12-F30	≤0.03	≤0.025	≤0.020
			F36-F60	≤0.025	≤0.020	≤0.018
			F70-F120	≤0.020	≤0.015	≤0.010
			F150-F220	≤0.015	≤0.010	≤0.010
	7	Ferroalloy grains	F4-F220	Comply with the regulations of GB2480-83	Same quality product	Same quality product
Physical properties	8	particle density	Take F46 as the representative number	3.18-3.22g/ ^cm3	Same quality product	Same quality product
Physical properties	9	Bulk density	F4-F220	Comply with relevant regulations in GB2483-83	Same quality product	Same quality product