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By certification 
Refractory Material：
Properties |
mullite |
Density (g/cm3) |
≥2.65 |
Flexural strength, 3-or 4-pts., at 20℃ (MPa) |
≥80 |
Linear thermal expanding coefficient (1x10-6 mm/℃) |
≤6 |
Dielectric strength (KV/mm) |
≥18 |
Dielectric constant (1MHz, 20℃) |
≤7.5 |
Volume resistivity (100℃, Ω.cm) |
≥1011 |
