Properties & Applications of Silica (SiO2) Powders

C.T. Kang , Ph.D. email to ctkang@cris.com
Last revised: 1996/12/21

Properties

	Crystalline Silica Powders	Fused Silica Powder
Theoretical Density	2.65 g/cc	2.20 g/cc
Crystallinity	alpha-phase	>95% fused silica
Melting Point	1477oC	1713oC
Thermal Expansion Coefficient	4.0 X 10 -6 / o C	4.84 X 10 -7 / o C
Mohs Hardness	7	7
Resistivity	> 1015 ohm. cm	> 1016 ohm. cm

Applications

• Filler for paints, plastic, epoxy
  
  

Particle Size Distributions

CG Grade

		Surface Area	Average Particle
	SiO2 Content	cm2/g	Size, micron
CG-45	> 98.5%	> 4,500	13 - 18
CG-39	> 98.5%	> 7,000	8 - 12
CG-25	> 98.5%	> 10,000	5 - 8
CG-10	> 98.5%	> 15,000	2 - 5
CG-5	> 98.5%	> 20,000	1 - 1.5

Particle size (mm)	50 (300 Mesh)	39 (400 Mesh)	25 (600 Mesh)	10 (1000 Mesh)
< 0.010	--	--	--	> 65%
0.010 - 0.073	--	--	--	< 35%
< 0.025	--	--	> 70%	--
0.025 - 0.150	--	--	< 30%	--
< 0.039	--	> 75%	--	--
0.039 - 0.150	--	< 25%	--	--
< 0.050	> 80%	--	--	--
0.050 - 0.150	< 20%	--	--	--
> 0.150	< 0.05%	< 0.01%	0	--
> 0.073	--	--	--	0

Product Information

You can hyperlink to the following web pages and find more information about these products which we handle.

Boron Nitride, BN: Properties, applications and products of boron nitride powders

Boron Carbide, B4C: Properties, applications and products of boron carbide

Boron Carbide Nozzles and Inserts: Advantages and product information of boron carbide nozzles and inserts. Both nozzles and insert are produced by Malyn Industrial Ceramics, Inc..

Boron Carbide Containing Welding Electrodes: Application of boron carbide powder. In this case, welding rods containing B4C are used to improve the wear resistance of surface.

Boriding Agents: Properties, applications of two boriding agents

INEX Si / SiC Composite Radiant Tube: High temperature Si/SiC composite radiant / protective tubes for heat treatment industry

INEX in Chinese Information about INEX Si/SiC tubes written in Chinese.

MCrAlY Coatings: High temperature corrosion resistant coatings

Mechanical Seals and Seal Rings: Seal ring materials include: reaction bonded SiC, tungsten carbide, alumina and silicon nitride.

MoSi2 Heating Element

SiC: Properties, applications and products of silicon carbide

SiO2: Properties, applications and product information of silica powders

Steel Wool: Properties, applications and product information

Zirconia Powders: Information of two available.ZrO2 powders

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Other Links

Thermal spray related links: List of commercial and noncommercial web pages which are related to thermal spray coatings

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