Magnesium Oxide

(slip cast or/and pressed)

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Almath made Magnesium Oxide Crucibles (Magnesia) are cast and fully vitrified and available in various standard sizes, shapes, and wall thicknesses for a range of high temperature applications. MgO benefits from having a higher maximum working temperature (2200 °C for MgO vs 1750 °C for alumina) and increased corrosion resistance over Alumina.

The grain size of this material is 10-50µm (microns).

Almath can produce these MgO crucibles in most of our standard stock sizes, we can also produce MgO to custom specifications.

Please contact us for information on material specifications, lead time and prices.

These crucibles are made by Almath in the United Kingdom.

Material Uses

MgO exhibits superior chemical resistance comparing to alumina, making it inert towards metals, slags, and superconducting compounds
MgO crucibles find widespread use as containers in various applications, including high-temperature molten salt electrolysis, metal smelting, and slag containment and processing
Both Mg and O have very low neutron cross-sections, making MgO an excellent choice due to its extraordinarily low neutron absorption
It's reasonable neutron moderation capabilities and high-temperature performance make MgO a good candidate for use in nuclear applications
By far the largest consumer of magnesia worldwide is the refractory industry, which consumed about 56 % of the magnesia in the United States
In 2004, the remaining 44 % being used in agricultural, chemical, construction, environmental, and other industrial applications

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

Material Datasheets

Isopressed Magnesium Oxide

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View our full range of MGO products.

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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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