Black Silicon Carbide P Grit

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Black Silicon Carbide P Grit

Henan Superior Abrasives

Black silicon carbide P grit is the abrasive used for coated abrasives. Its raw material is the same as black silicon carbide F grit, which is the first grade silicon carbide lump from quartz sand and coke high temperature smelting. Black silicon carbide P grit has a SiC purity of 98% or more, and is acid-washed before crushing, and the particles are sieved according to the standard P abrasive. The hardness of black silicon carbide is 9.2-9.3, slightly lower than green silicon carbide. It has higher hardness and toughness than corundum, good grinding power, and is suitable for grinding of various metal and non-metal materials.

Black Silicon Carbide P Grit Characteristics

The silicon carbide abrasives used in the manufacture of abrasives have the following characteristics in addition to the good thermodynamic and physical properties of silicon carbide.

1. high purity, the guaranteed value of silicon carbide content is over 98%.
2. Black silicon carbide P Grit is acid washed in two passes, the first one is cleaning before crushing and the second one is cleaning after sieving, which removes the free carbon and free silicon produced during the smelting process, with less suspended matter and high cleanliness.
3. Black silicon carbide P Grit has good hydrophilicity, which is conducive to the degree of holding and bonding of the particles to the substrate.
4. P standard silicon carbide particle size distribution is more concentrated than F standard abrasives, and the abrasives coated with abrasives are only attached to a layer of the substrate, which requires the abrasives to participate in grinding as much as possible. The content of basic grains is high and the content of large grains is strictly controlled, while fine grains will increase the amount of desanding of abrasives, and the content of fine grains and dust should be as low as possible.
5. Silicon carbide abrasives for abrasive production require suitable bulk density, which is generally smaller than silicon carbide F Grit. The particle shape is multi-pronged or cone shaped, with strong grinding power.

Black Silicon Carbide P Grit Chemical composition

SiC	≥98%
SiO₂	≤1%
H₂O₃	≤0.5%
Fe₂O₃	≤0.1%
F.C	≤0.15%
Magnets	≤0.02%

Physical indicators of black silicon carbide P Grit

Moh’s hardness	9.2
melting point	2300 ℃ free
Operating temperature	1900℃
proportion	3.2-3.45 g/cm ³
Bulk density	1.2-1.6 g/cm3
color	black
Crystal form	Hexagonal system
Elastic Modulus	58-65×10⁶psi
Thermal expansion coefficient	3.9-4.5 x10^-6/ ℃
Thermal conductivity	71-130 W/MK

Applications of black silicon carbide P grit

Coated abrasives for stone glass, such as sandpaper, emery cloth.
Sponge sanding block, black diamond and other flexible abrasives.
Can be used as raw materials for polishing wheels, wire drawing wheels, polishing grid sanding discs and other abrasives.
Used for products such as skateboard wear-resistant surface sand, nail tools wear-resistant layer.
Raw material for abrasive wire and abrasive brush.
Used as raw material for polishing abrasives such as oil stone, sharpening stone and other tools.
Direct grinding, such as gemstone agate, glass artwork polishing and grinding, etc.

Common specifications of black silicon carbide P grit

Black silicon carbide P grit: 16#,20#,24#,30#,36#,40#,50#,60#,80#,100#,120#,150#,180#,220#

Black silicon carbide P standard micro powder: 240#,280#,320#,360#,400#,500#,600#,800#,1000#,1200#,1500#,2000#,2500#,3000#,4000#,5000#

Black silicon carbide P grit grain size distribution

Granularity	Coarse Grain	coarse grain		elementary particles		mixed grain		sieve sum		fine grain
Granularity	100% passed the following sieves	do not pass the sieve	wt% not more than	do not pass the sieve	wt% not less than	don’t pass sieve	wt% not less than	pass the sieve	wt% not less than	wt% not more than
P16	8	12	3	14	20-32	14 16	66-84	14 16 18	96	4
P20	12	16	7	18	34-50	18 20	80-92	18 20 25	96	4
P24	14	18	1	20	10-18	20 25	53-70	20 25 30	92	8
P30	16	20	1	25	10-18	25 30	53-70	25 30 35	92	8
P36	18	25	1	30	10-18	30 35	53-70	30 35 40	92	8
P40	25	35	7	40	34-50	40 45	80-92	40 45 50	96	4
P50	30	40	3	45	20-32	45 50	66-84	45 50 60	96	4
P60	35	45	1	50	10-18	50 60	53-70	50 60 70	92	8
P80	45	60	3	70	20-32	70 80	66-84	70 80 100	96	4
P100	50	70	1	80	10-18	80 100	53-70	80 100 120	92	8
P120	70	100	7	120	34-50	120 140	80-92	120 140 170	96	4
P150	80	120	3	140	20-32	140 170	66-84	140 170 200	96	4
P180	100	140	2	170	10-20	170 200	50-84	170 200 230	90	10
P220	120	170	2	200	10-20	200 230	50-84	200 230 270	90	10

P-standard micropowder particle size composition standard

granularity	D0（um）	D3(um)	D50(one)	D95(one)
P240	Below 110	Below 81.7	58.5±2.0	44.5 and above
P280	Below 101	Below 74.0	52.2±2.0	39.2 and above
P320	Below 94	Below 66.8	46.2±1.5	34.2 and above
P360	Below 87	Below 60.3	40.5±1.5	29.6 and above
P400	Below 81	Below 53.9	35.0±1.5	25.2 and above
P500	Below 77	48.3 or less	30.2±1.5	21.5 and above
P600	Below 72	Below 43.0	25.8±1.0	18.0 and above
P800	Below 67	38.1 or less	21.8±1.0	15.1 and above
P1000	Below 63	Below 33.7	18.3±1.0	12.4 and above
P1200	Below 58	29.7 or less	15.3±1.0	10.2 and above
P1500	Below 53	22.4 or less	12.6±1.0	8.3 and above
P2000	Below 45	19.3 and below	10.3±0.8	6.7 and above
P2500	Below 38	14.0 and below	8.4±0.5	5.4 and above
P3000	Below 32	Below 12.0	6.7±0.5	3.0 or above
P4000	Below 27	11.0 and below	5.5±0.5	2.0 or above
P5000	23 or less	Below 8.0	4±0.5	1.8 or above