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Table 2

Basic parameters of tested ceramics.

Parking according to ČSN EN 60672 Symbol Unit CORDIERIT
Corundum ceramics
Commercial name TH 7/7 R12 BM Luxal 203
Porosity pa [%] 0.5
Density ρa [–3] 2.1 min. 3.8
Bending strength σ [MPa] 60 min. 300
Thermal expansivity coefficient α30–600 [10–6K–1] 2–4 7–8
Heat conductivity λ30–10 [Wm–1K–1] 1.2–2.5
Resistance against sudden chase of temperature ΔT [K] 250 min. 150
Relative permittivity εr [–] 5
Al2O3 content % by weight 33 min. 99.5
Inner electric resistance at 30, 200 and 600 °C ρv,30 [Ω.m] 1010
ρv,200 [Ω.m] 106 1012
ρv,600 [Ω.m] 103 108

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