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Formula: SiO₂ 46/Al₂O₃ 16/MgO 17/K₂O 10/B₂O₃ 7
Form: Rod
Material: MACOR® Machinable Glass Ceramic
Commodity: Glasses
MACOR® Machinable Glass Ceramic Rods are a popular choice in our extensive range of ceramic materials. Offering 56 variations, these machinable glass-ceramic rods provide an aluminum silicate composition with excellent electrical insulation and high-temperature resistance. Applications include semiconductor wafer handling components, vacuum viewports and feedthroughs, and other parts requiring precision machined ceramics. The availability of MACOR® Machinable Glass Ceramic Rods in multiple diameters and lengths makes them an ideal choice for the prototyping and small-scale production of ceramic mechanical components.
Tolerances
Rod
| Diameter | +20% / -10% |
|---|
Material Properties for Glasses
Chemical Resistance
| Element | Value |
|---|---|
| Acids - concentrated | Poor |
| Acids - dilute | Fair |
| Alkalis | Fair |
| Halogens | 0 |
| Metals | 0 |
Electrical Properties
| Element | Value |
|---|---|
| Dielectric constant | 0 |
| Dielectric strength( kV mm⁻¹ ) | 0 |
| Volume resistivity( Ohmcm ) | >10¹⁴@25 |
Mechanical Properties
| Element | Value |
|---|---|
| Poisson's ratio | 0 |
| Tensile modulus( GPa ) | 67 |
| Hardness - Knoop( kgf mm⁻² ) | 0 |
| Hardness - Vickers( kgf mm⁻² ) | 400 |
| Shear strength( MPa ) | 0 |
| Tensile strength( MPa ) | 0 |
| Fracture toughness( MPam(0.5) ) | 0 |
Physical Properties
| Element | Value |
|---|---|
| Refractive index | 0 |
| Useful optical transmission range | 0 |
| Apparent porosity( % ) | 0 |
| Water absorption - saturation( % ) | 0 |
| Density( gcm⁻³ ) | 2.52 |
Thermal Properties
| Element | Value |
|---|---|
| Melting point( C ) | 0 |
| Sublimation point( C ) | 0 |
| Upper continuous use temperature( C ) | 800-1000 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 790@25°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 1.5@20°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 13@20-1000°C |
Pultrusions
| Element | Value |
|---|---|
| Compressive strength( MPa ) | 345 |