Ferro-Ceramic Grinding Inc. machines over 15 different materials
Macor® Macor is a machinable glass ceramic material offering many advantageous properties, including high use temperature, excellent insulating properties.
Macor is a machinable glass ceramic material offering many advantageous properties, including high use temperature, excellent insulating properties (electrical and thermal), and dimensional stability. It can be polished, machined to tight tolerances, tapped, sealed, and metallized.
It can be used in many of the same applications where alumina is used and the extreme high temperature and wear characteristics of alumina are not necessary.
|Chemical Formula||-||-||glass ceramic|
|Density, r||g/cm3||ASTM C20||2.52|
|Water Absorption||% @R.T.||ASTM C373||0.0|
|Hardness||knoop (kg/mm2)||Knoop 100g||250|
|Compressive Strength||MPa @ R.T.||ASTM C773||345|
|Tensile Strength||MPa @ R.T.||ACMA Test #4||90|
|Modulus of Elasticity|
|Flexural Strength (MOR)||MPa @ R.T.||ASTM F417||94|
|Poisson's Ratio, u||-||ASTM C818||0.29|
|Fracture Toughness, KIc||MPa x m1/2||Notched Beam Test||1.53|
|Max. Use Temperature|
(* denotes inert atm.)
|ºC||No load cond.||1000|
|Thermal Shock Resistance||DT (ºC)||Quenching||25 - 100|
|Thermal Conductivity||W/m-K @ R.T.||ASTM C408||1.46|
|Coefficient of Linear Thermal Expansion, al||mm/m-ºC (~25ºC through ±1000ºC)||ASTM C372||6.3 - 9.7|
|Specific Heat, cp||cal/g-ºC @ R.T.||ASTM C351||0.19|
|Dielectric Constant||1MHz @ R.T.||ASTM D150||6.03|
|Dielectric Strength||kV/mm||ASTM D116||40|
|Electrical Resistivity||Wcm @ R.T.||ASTM D1829||>1017|