Abrasifs PA :
Les abrasifs PA sont de l’alumine Bayer, qui est fondue électriquement à haute température, et ajoutée avec la bonne quantité de chrome oxydé. Il est rose. Sa dureté est proche, mais sa ténacité est supérieure à celle de WA.
Composition chimique:
| spécification | Faible teneur en chrome | Chrome moyen | Haute teneur en chrome | ||||||
| Al2O3 (%) | Cr2O3 (%) | Na2O (%) | Al2O3 (%) | Cr2O3 (%) | Na2O (%) | Al2O3 (%) | Cr2O3 (%) | Na2O (%) | |
| F12-F80 | ≥98,50 | 0,20-0,45 | ≤0,50 | ≥98,20 | 0,45-1,00 | ≤0,55 | ≥97,40 | 1h00-2h00 | ≤0,55 |
| F90-F150 | ≥98,50 | ≤0,50 | ≥98,20 | ≤0,60 | ≥97,00 | ≤0,60 | |||
| F180-F220 | ≥98,50 | ≤0,50 | ≥98,80 | ≤0,70 | ≥96,50 | ≤0,70 | |||
Propriété physique:
| Minéraux de base | Taille du cristal µm | Véritable densité g/cm3 | Densité apparente g/cm3 | Dureté des nœuds kg/mm2 |
| α-Al2O3 | 600-2000 | ≥3,90 | 1.40-1.91 | 22h00-23h00 |
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