Hexagonal Boron Nitride

Hexagonal boron nitride ( white graphite ) is a loose, lubricious and hygrometric white powder. Its theoretical density is 2.27/cm3, Mohs hardness is 2. Its mechanical strength is lower, but higher than the graphite. It has not the exact melting point, but sublimates at 3000 in 0.1Mpa nitrogen gas. The highest working temperature is 2800 in nitrogen or argon gas, but below 1000 in oxygen.

Hot pressed boron nitride(HP-BN) Ceramic

Types of Properties	S-BN-1 (high thermal conductive)	S-BN-2 (high purity)	S-BN-3 (typical)	SBN-4 (normal)
Chemical Compositin (%)
BN	95	99	95-97	70
B2O3	3.5	<1	3-5	SiO2 ,30
CaO	1.5	--	--	--
Fe,Co,Ni,Cu,Na,K etc	<0.07	<0.01	<0.05	--
Physical properties
Density(g/cm3)	2.0-2.1	1.9-2.0	2.0-2.1	1.9-2.0
Compressive strength(kg/cm2)	1000	600	2000	1980
Flexual Strength(kg/cm2)	630	400	1000	763
The electricity properties(at room temperature and in dry air)
Volume resistivity(.cm)	>1013	>1014	>1012	7.5*109(1200)
Dielectric constant(108hz)	4.5	4.0 :	4.3	4.7
Dielectric loss
108hz	6.3*10-4	4*10-4		99*10-3
1010hz	1.9-2.8*10-3	1.2*10-3
Dielectric breakdown voltage(Kv/mm)	20-30	20-30	20-30	4.56
Thermal expansion coefficient 1*10-6
25-500	11.8	1.72	6.5	2.26
25-500	-0.36	-1.18	1.2
Thermal conductive(k/cm.s. )	0.1	0.064

Other Ceramic Products

Description	Specification	Size	Application
Al2O3 Powder	& 99.99% &99.999%	50nm	Flourescence pwoder, Grinding material, Crystal, Ceramic, activator etc.
Al2O3 Roller	Density2.5g/cm3Hardness >45MPa	tailor-made	Mechanism, chemistry, metallurgy, aviation, military, car ans ship production, etc.
SiC Powder	99.8%,C0.4%£¬Si+SiO0.05%	around 0.5um	Ceramic, dope and grinding material, electronic components, etc.
TiB2 Powder	Ti67.5%,	4-8um	Ceramic cutting tool and components,