| Typus | Feldspathum | Feldspath-Molai | Lapis Molai | Molai-Corundum | Corundum | |||||
| Res | ||||||||||
| Contentum chemicum | Al₂O₃ | XX-XXX | XXX-XLV | 45-70 | 70-90 | ≥90 | ||||
| Al₂O₃+SiO₂ | ≥90 | |||||||||
| Fe₂O₃ | ≤1 | |||||||||
| Adsorptio aquae (%) | ≤5 | |||||||||
| Resistentia acidorum (%) | ≥98 | |||||||||
| Resistentia alcalica (%) | ≥80 | ≥82 | ≥85 | ≥90 | ≥95 | |||||
| Temperatura operationis (°C) | ≥1300 | ≥1400 | ≥1500 | ≥1600 | ≥1700 | |||||
| Vis conterens | Φ3mm | ≥400 | ≥420 | ≥440 | ≥480 | ≥500 | ||||
| Φ6mm | ≥480 | ≥520 | ≥600 | ≥620 | ≥650 | |||||
| Φ8mm | ≥600 | ≥700 | ≥800 | ≥900 | ≥1000 | |||||
| Φ10mm | ≥1000 | ≥1100 | ≥1300 | ≥1500 | ≥1800 | |||||
| Φ13mm | ≥1500 | ≥1600 | ≥1800 | ≥2300 | ≥2600 | |||||
| Φ16mm | ≥1800 | ≥2000 | ≥2300 | ≥2800 | ≥3200 | |||||
| Φ20mm | ≥2500 | ≥2800 | ≥3200 | ≥3600 | ≥4000 | |||||
| Φ25mm | ≥3000 | ≥3200 | ≥3500 | ≥4000 | ≥4500 | |||||
| Φ30mm | ≥4000 | ≥4500 | ≥5000 | ≥5500 | ≥6000 | |||||
| Φ38mm | ≥6000 | ≥6500 | ≥7000 | ≥8500 | ≥10000 | |||||
| Φ50mm | ≥8000 | ≥8500 | ≥9000 | ≥10000 | ≥12000 | |||||
| Φ75mm | ≥10000 | ≥11000 | ≥12000 | ≥14000 | ≥15000 | |||||
| Densitas voluminis (kg/m3) | 1100-1200 | 1200-1300 | 1300-1400 | 1400-1550 | ≥1550 | |||||
| Diameter | VI/VIII/X | XIII/XVI/XX/XXV | XXX / XXXVIII / L | LX / LXXV |
| Tolerantia diametri | ± 1.0 | ± 1.5 | ± 2.0 | ± 3.0 |
| Diameter pori | 2-3 | 3-5 | 5-8 | VIII-X |