Castings|Carbon and graphite|Military kits|Packing material|Chemicals-Dalian UniTech Ltd

Grade Item	3N			4N					5N
Grade Item	DKH301	DKH302	DKH303	DKH401	DKH402	DKH402	DKH403	DKH404	DKH501	DKH502
Crystal Form	γ	α	γθ	γ	γ	γ	α	α	α	α
Purity (%) ≥	99.92	99.92	99.92	99.99	99.99	99.99	99.99	99.99	99.999	99.999
D₅₀ (μm)	0.3 – 8.0	0.3 – 8.0	0.3 – 8.0	0.3 0.6	0.4 – 0.8	0.5 – 1.2	0.3 – 0.2	1.0 – 3.0	0.4	0.4
Loose Bulk Density (g/cm³)	0.16 – 0.3	0.40 – 0.9	0.18–0.20	0.15–0.20	0.16–0.18	0.17–0.20	0.4 – 1.0	0.3 – 0.6	0.5 –1.0	0.5 – 1.0
Bet Surface Area (cm²/g)	150–300	5 – 10	80 – 150	200–400	150–300	150–300	5 – 12	10 – 50	5 – 12	5 - 12
Impurity Level (ppm) ≤
Si (ppm) ≤	100	100	100	40	40	40	40	40	5	10
Na (ppm)≤	90	50	50	20	20	20	20	20	1	1
Cu (ppm)≤	0	0	0	0	0	0	0	0	0	0
Mg (ppm)≤	10	10	10	8	8	8	8	8	1	5
Cr (ppm)≤	3	3	3	3	3	3	3	3	2	2
Fe (ppm)≤	100	150	100	10	10	10	10	10	2	5
K (ppm) ≤	3	3	3	3	3	2	2	2	1	1
Crystal Appearance	Fiber, Ball
Application	Nanometer high-purity alumina has numerous applications, such as the primary material for the polishing abradant, man-made tooth and bone, tape, tube, monocrystals, jewel, sapphires, manufacture of high density ceramic substrates for electronic, cutting tools, thread guides, translucent ceramic tubes for high-pressure sodium vapor lamps, infrared and ultraviolet windows, lenses, bearing, prisms, pivots, rolling machines, wave guides, nozzles, laser benches, precision gauge, knife edges, pressure sensors, solar cells, avionic optics, fine morttars, and standard reagents etc.