Oct 22, 2026: We are working on protecting our servers against the PHP2Shell vulnerability recently discovered. Servers were upgraded ahead of schedule on Oct 21. This could cause some issues. Please contact us if you encounter any.
| Oxide | Analysis | Formula | Tolerance |
|---|---|---|---|
| CaO | 0.28% | 0.02 | |
| K2O | 0.70% | 0.02 | |
| MgO | 0.22% | 0.02 | |
| Na2O | 0.71% | 0.04 | |
| TiO2 | 1.35% | 0.06 | |
| Al2O3 | 30.44% | 1.00 | |
| SiO2 | 53.45% | 2.98 | |
| Fe2O3 | 1.61% | 0.03 | |
| LOI | 11.23% | n/a | |
| Oxide Weight | 297.42 | ||
| Formula Weight | 335.05 | ||
Kaiser was reorganized into National refractories in 1985, the fireclay is now sold at NAT Dry Milled Fireclay.
| Materials |
NAT Dry Milled Fireclay
|
| Materials |
Fireclay
|
| Typecodes |
Fireclay
Fireclays are non-kaolin non-ball clay materials similar to stoneware clays but lacking fluxing oxides. Many fireclays have a PCE of 28 or more. |
| Pyrometric Cone Equivalent | 31 |
|---|
![]() PayPal | No tracking, No ads, No paywall, No transient content! Just organized, concise information constantly updated and improved. Was this helpful? Consider supporting me. |
| By Tony Hansen Follow me on ![]() | ![]() |
Buy me a coffee and we can talk