Machinable Glass (Macor) Ceramic Properties

Machinable Glass (Macor) Ceramic Properties
Item	Unit	Typical Values
Physical Properties
Color		White
Main Composition		55% Fluorophlogopite + 45% Borosilicate Glass
Density	g/cm3	2.60
Apparent Porosity		0.07%
Water Absorption		0
Normal Temperature Outlet Rate	ml/S·cm2	8.8*10-9
Helium Transmission Rate	ml/S	1*10-10
Mechanical Properties
Rockwell Hardness(45N)	R45N	40
Vickers Hardness (Load 500g)	Gpa(Kg/mm2)	11.5（1175）
Flexural Strength （20°C）	Mpa	＞108
Compressive Strength (20°C)	Mpa	488
Modulus of Elasticity (25°C)	Gpa	65
Poisson’s Ratio		0.29
Impact Toughness	KJ/m2	＞2.56
Thermal Properties
Specific Heat (25°C)	kJ/kg°C	0.79
Thermal Conductivity (25°C)	W/m.K	1.71
Thermal Diffusivity (25°C)	x 10-7 m²/s	7.3
Thermal Expansion Coefficient	10-6/°C	7.2
Thermal Shock Resistance	△T°C	200
Maximum Working Temperature	°C	800
Electric Properties
Dielectric Strength	KV/mm	＞40
Volume Resistivity(25°C）	Ω.cm	1.08*1016
Volume Resistivity(200°C）	Ω.cm	1.5*1012
Volume Resistivity(500°C）	Ω.cm	1.1*109
Dielectric Loss		1-4*10-3
Dielectric Constant	Er	6-7