Magnesium Oxide

(slip cast or/and pressed)

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Almath manufactures magnesium oxide (MgO) crucibles in a range of grades to suit different process requirements. Using both slip casting and pressing techniques, we produce fully dense MgO ceramics that offer excellent high-temperature performance and enhanced resistance to attack from basic materials.

For applications involving rapid heating, we also offer a thermal shock resistant MgO grade specifically designed for demanding processes such as induction melting and the handling of alkali metals, alkali earth metals, rare earth materials, and other basic slag-forming compounds. Our MgO crucibles are available in a wide range of standard sizes, shapes, and wall thicknesses, while our in-house tooling capability allows us to manufacture bespoke designs where standard products do not meet your requirements.

Whether your priority is maximum chemical resistance, high-temperature performance, or thermal shock resistance, our technical team can help identify the most suitable MgO grade for your application.

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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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Isopressed Magnesium Oxide

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Magnesium Oxide

Magnesium Oxide

(slip cast or/and pressed)

Material properties

Material Datasheets

View our full range of MGO products.

Contact us to discuss a custom MGO solution.

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