MACOR® Machinable Glass Ceramic

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Almath Crucibles offers a variety of MACOR® Machinable Glass Ceramic Products.

MACOR® can be considered a unique, technical material with a composition comprising 55% fluorophlogopite mica and 45% borosilicate glass. The white, ordorless and non-outgassing material exhibits zero porosity and is favoured due to its ability to machined with ordinary metalworking/machining tools rather than more expensive diamond tooling required to machine hard materials such as alumina.

MACOR® comes with a wide range of benefits:

Easily machinable
Withstands high temperatures
Low thermal conductivity
Holds tight tolerances
Electrical insulator
Zero porosity and no outgassing
Strong & rigid
Highly polishable
Can be soldered to a wide range of material
Radiation resistant
Lead free

Industry Applications

MACOR® is suitable for a range of technical ceramic applications, where high performance properties are required in demanding conditions. Applications include, but are not limited to:

Aerospace

Automobile

Chemical

Laser Tech

Medical

Military

Nuclear

Semiconductor

Material properties

Please note that the information set forth herein is offered for comparison only, and is not to be construed as absolute engineering data or constituting a warranty or representation for which we assume legal responsibility.

	SI/Metric	Imperial
Coefficient of Expansion CTE -100°C->25°C	81 x 10-7 /°C	45x10-7 /°F
Coefficient of Expansion CTE 25°C->300°C	90 x 10-7 /°C	50x10-7 /°F
Coefficient of Expansion CTE 25°C->600°C	112 x 10-7 /°C	62 x 10-7 /°F
Coefficient of Expansion CTE 25°C->800°C	123 x 10-7 /°C	68 x 10-7 /°F
Specific Heat, 25°C	0,79 kJ/kg°C	0.19 Btu/lb°F
Thermal Conductivity, 25°C	1,46 W/m°C	10.16 Btu.in/hr.ft2/hr
Thermal Diffusivity, 25°C	7,3 x 10-7 m2/s	0.028 ft2/hr
Continuous Operating Temperature	800°C	1472°F
Maximum No Load Temperature	1000°C	1832°F

	SI/Metric	Imperial
Density	2,52 g/cm3	157 lbs/ft3
Porosity	0%	0%
Young's Modulus, 25°C (Modulus of Elasticity)	66,9 GPa	9.7x10(6) PSI
Poisson's Ratio	0,29	0.29
Shear Modulus, 25°C	25,5 GPa	3.7x10(6) PSI
Knoop Hardness, 100g	250 kg/mm2	-
Modulus of Rupture, 25°C (Flexural Strength)	94 MPa (minimum specified average value)	13600 PSI
Compressive Strength (After polishing)	345 MPa (up to 900 MPa)	49900 PSI (130000 PSI)

	SI/Metric	Imperial
Dielectric Constant, 25°C - 1 kHz	6,01	6.01
Dielectric Constant, 25°C - 8,5 GHz	5,64	5.64
Loss Tangent, 25°C - 1 kHz	0,0040	0.0040
Loss Tangent, 25°C - 8,5 GHz	0,0025	0.0025
Dielectric Strength (AC) avg. 25°C, under 0,3 mm thickness	45 kV/mm	1143 V/mil
Dielectric Strength (DC) avg. 25°C, under 0,3 mm thickness	129 kV/mm	3277 V/mil
DC Volume Resistivity, 25°C	10(17)Ohm.cm	10(17)Ohm.cm

Solution	pH	Time	Temp	Weight Loss (mg/cm2)
5% HCl (Hydrochloric Acid)	0,1	24 Hrs	95°C	~100
0,002 N HNO(3) (Nitric Acid)	2,8	24 Hrs	95°C	~0,6
0,1 N NaHCO(3) (Sodium Bicarbonate)	8,4	24 Hrs	95°C	~0,3
0,02 N Na(2)CO(3) (Sodium Carbonate)	10,9	6 Hrs	95°C	~0,1
5% NaOH (Sodium Hydroxide)	13,2	6 Hrs	95°C	~10

Chemical Durability		Class
DIN 12111 / NFISO 719	Water	HGB2
DIN 12116	Acid	4
DIN 52322 / ISO 695	Alkali	A3

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Almath Crucibles Ltd.

Epsom Building,
The Running Horse,
Burrough Green,
Newmarket, Suffolk
CB8 9NE

ISO 9001:2015 registered
(CQS Cert #GB2001792)

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