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1 ALUMINA:
Our A 997 Alumina contains 99.7 % Alumina. It is very yarn-friendly, fine-grained, and highly wear-resistant owing to its very high hardness. It can be polished to extremely low roughness, less than 0.1 Micron Ra. It is available in Russet and Ivory tints. Our A997 Alumina is ideal for applications with high speeds and high tensions. Recommended for texturizing machinery, winders, and spinning machinery; synthetic micro-yarns, coarse and hard synthetic yarns, glass, carbon, and silk; nylon cords and ropes, tyre cords, metal wires, metal cables. Typical Properties:
Property Units  
Purity % 99.7
Specific Gravity - 3.92-3.94
Colour - Russet/Ivory
Hardness Rockwell C 45 N 83
Roughness Ra Microns 0.02 to 1.0, as needed
Open Porosity % 0
Flextural Strength MPa 390
Compressive Strength MPa 3900
Impact Resistance MPa m1/2 5.2
Thermal Expansion Coefficient 10 -6 / K 5.5-8.4
Thermal Conductivity W/mK 28
Volume Resistivity Ohm.cm 1015
Dielectric Strength KV/mm KV/mm
Thermal Shock Resistance 0C 280
Max. Usage Temperature 0C 1700
 
2 TITANIA:
Titania has a surface that is most friendly and tender towards the yarn, because of its grain and crystal structure. It is ideal for delicate yarns. It is softer than Alumina, so life will be less. Recommended for texturizing machinery. table here

3. CONDUCTIVE TITANIA: This black-coloured Titania has a conductive surface, which conducts away static electricity generated in processing the yarn. This Conductive Titania is most friendly and tender towards the yarn, because of its special grain and crystal structure. It is ideal for silk, carbon, glass and micro yarns. It is softer than Alumina, so life will be less. Recommended for texturizing machinery, synthetic micro-yarns, silk, glass, and carbon fibers.

Typical Properties.
Property Units Titania T07/Conductive TitaniaT07 C
Purity % 95
Specific Gravity - 4.0
Colour - Tan or Black
Hardness Rockwell C 45 N 70
Roughness Ra Microns 0.1-0.9
Open Porosity % 0
Flextural Strength MPa 70
Compressive Strength MPa 600
Impact Resistance MPa m1/2  
Thermal Expansion Coefficient 10 -6 / K 8.5
Thermal Conductivity W/mK 24
Volume Resistivity Ohm.cm 1010
Dielectric Strength KV/mm  
Thermal Shock Resistance 0C -
Max. Usage Temperature 0C -
 
4 Zirconia:
Zirconia is as yarn-friendly as Titania, and has high hardness, toughness and is very wear resistant. Owing to its very high cost, it is only used for special applications.
Property Units Titania T07/Conductive TitaniaT07 C
Purity % 95
Specific Gravity - 5.8
Colour - Yellow
Hardness Rockwell C 45 N 72
Roughness Ra Microns 0.1-1.2
Open Porosity % 0
Flextural Strength MPa 1000
Compressive Strength MPa 3000
Impact Resistance MPa m1/2 8
Thermal Expansion Coefficient 10 -6 / K 10
Thermal Conductivity W/mK <2
Volume Resistivity Ohm.cm >1010
Dielectric Strength KV/mm -
Thermal Shock Resistance 0C 250
Max. Usage Temperature 0C 1000
 
5 W08 TUNGSTEN CARBIDE:
Our Tungsten Carbide has high hardness, toughness, and is very wear-resistant. It has good thermal conductivity and some electrical conductivity, owing to its small metal content. Recommended for metal wire machinery.

Typical Properties.
Property Units Titania T07/Conductive TitaniaT07 C
Purity % 89
Specific Gravity - 14.5
Colour - Black
Hardness Rockwell C 45 N 89
Roughness Ra Microns 0.2-1.2
Open Porosity % 0
Transverse Rupture Strength N/mm2 3000
Metal Content % 11
Thread guides, to perform best, need the correct surface roughness and topography. Each of the materials we offer is finished to the correct roughness needed, not necessarily the lowest one.

Our ceramic parts can be supplied in these finishes:
1) Smooth Satin. This is a rumbled matt surface, with a light sheen. Roughness will be about 0.6 Micron Ra.
2) Diamond-polished to 0.25-0.4 Micron Ra.
3) Highly polished (to low Ra values, e.g. 0.1 Micron).
4) Diamond polished, with low friction properties. Normally diamond polishing increases the contact area between the yarn and the ceramic. In this polishing method, both the roughness and the contact area are reduced, leading to lower friction. This is available only in the A 997 Alumina ceramic.

MATERIAL PARAMETERS
Property Units Alumina A997 Titania T07 Zirconia (Y-PSZ) Z09
Purity % 99.7 95 95
Specific Gravity - 3.92-3.94 4.0 5.8
Colour - Russet/Ivory Tan or Black Yellow
Hardness Rockwell C 45 N 83 70 72
Roughness Ra Microns 0.02 to 1.0, as needed/td> 0.1-0.9 0.1-1.2
Open Porosity % 0 0 0
Flextural Strength MPa 390 70 1000
Compressive Strength MPa 3900 600 3000
Impact Resistance MPa m1/2 5.2   8
Thermal Expansion Coefficient 10 -6 / K 5.5-8.4 8.5 10
Thermal Conductivity W/mK 28 24 <2
Volume Resistivity Ohm.cm >1015 >1010 >1010
Dielectric Strength KV/mm 30   -
Max. Usage Temperature 0C 1700 - 1000