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Mullite & Porcelain - Typical Characteristics

Mullite

Excellent Thermal Shock Resistance
Good Abrasion Resistance
Good Wear Resistance
High Dielectric Properties

Porcelain

Good Resistance to Wear
Good Abrasion Resistance
Excellent Frost Resistance
It is Non Absorbent
Good Flexural Strength

Property Details

	Particulars	Units	Mullite (55% Al₂O₃)	Mullite (75% Al₂O₃)	Porcelain
Physical	Chemical Composition		3Al₂O₃.2SiO₂	3Al₂O₃.2SiO₂	Tri-axial Ceramics
	Density	gm / cc	2.8	> 3.80	2.4
	Porosity	%	Nil	Nil	Nil
	Colour		Tan	Tan	Buff
Mechanical	Flexural Strength	Kg / Cm²	1000	1200	1000
	Compressive Strength	Kg / Cm²	5650	6000	6000
	Hardness (Vickers)	HV10	1150 - 1200	1200	1000
Thermal	Thermal Shock Resistance	Deg C	> 200	> 200	-
	Thermal Conductivity	W/m Deg C	2	3	5
	Co-efficient of Thermal Expansion	x 10^-6 / Deg C	5.3	6	4.9
	Maximum Use Temperature	Deg C	1450 +	1600 +	1400
Electrical	Dielectric Constant	MHz	6	6	5.9
	Dielectric Strength	KV / mm	20	25	-
	Electrical Resistivity, 25 Deg C	Ω-Cm	10¹³	10¹³ - 10¹⁴	-

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