Sintered chrome oxide green grit for the hottest places on Earth — chrome-magnesia bricks, castables and linings. Choose your Cr(VI) ceiling to match your plant’s regulations.
Nine sintered grades across two Cr(VI) tiers — identical structural performance, different compliance ceilings. The Regular tier suits standard plants; the Low-Cr(VI) tier is built for sites governed by strict workplace regulations.
Fine to coarse — where each grade sits on the D50 ladder. D50 is the median particle size: half the particles are finer, half coarser. Castables want a fine D50 for flow; pressed bricks want a dense middle; ramming mixes want interlocking coarse grit. Green dot = Regular tier, cyan dot = Low-Cr(VI).
In refractories, chrome oxide green is not a pigment — it is a structural ceramic with one unbeatable property: chemical stability at temperatures that dissolve almost everything else.
The chrome-spinel phase absorbs aggressive CaO-FeO-SiO₂ slag chemistry without destroying the refractory matrix — extending campaigns in RH degassers, copper converters and glass-furnace regenerators.
Melting point 2435 °C, totally insoluble in water. Cr₂O₃ survives thermal cycling above 1700 °C where conventional alumina-silica systems fail.
The Low-Cr(VI) tier uses Jirong® Cr(VI) suppression technology — undetectable hexavalent chromium for plants that enforce the strictest occupational and environmental standards. Performance is unchanged.
Where chrome-magnesia linings pay for themselves — the four harshest environments our customers report.
Every service condition sits far below the 2435 °C melting point of Cr₂O₃ — that margin is the safety headroom your lining lives on.
Cyclic vacuum, oxygen blowing and FeO-rich slag in the same campaign. Chrome spinel absorbs the iron-oxide attack that destroys magnesia-carbon systems — hundreds of heats before relining.
Matte and fayalite slag with violent basicity swings at 1200–1300 °C. Cr₂O₃-bearing bricks resist the silica-iron slag line that devours standard alumina linings.
Alkali-vapour condensation and thermal cycling between burner reversals. Where silica brick and mullite sag and spall, the chrome grades hold their shape.
Clinker liquid-phase attack above 1400 °C. Chrome-magnesia hot-face brick delivers a stable coating layer and a predictable wear curve across multi-year campaigns.
The intrinsic Cr₂O₃ properties behind refractory performance — the same numbers as the pigment-grade datasheet.
| PROPERTY | VALUE | WHAT IT MEANS FOR YOUR LINING |
|---|---|---|
| Melting point | 2435 °C | Service ceiling far above any industrial furnace atmosphere |
| Boiling point | ≈ 4000 °C | Zero vapour pressure at any service temperature |
| Decomposition temperature | 2266 °C | No thermal degradation in service |
| Mohs hardness | 8.5 – 9 | Abrasion-resistant hot face against moving charge |
| Theoretical density | 5.21 g/cm³ | Dense sintered packing, low apparent porosity |
| Water solubility | Insoluble | No hydration damage in storage or heat-up |
| Chemical character | Amphoteric | Stable to basic slags and acidic condensates alike |
Match the grade to your forming method.
| FORMING METHOD | RECOMMENDED GRIT | WHY |
|---|---|---|
| Pressed brick | D50 1.2 – 2 μm | Dense packing, high green strength, even firing shrinkage |
| Castable | D50 1 – 4 μm | Good flow, excellent packing, low water demand |
| Ramming mix | D50 4 – 8 μm | Interlocking aggregate structure, mechanical-wear resistance |
| Kiln furniture | D50 2 – 4 μm | Balanced strength and thermal-shock resistance |
| Regulated sites | Low Cr(VI) tier | Choose G-5891 / G-5899 / G-5996 / G-5070 / G-5073 where kiln-side regulations demand it |
Industry articles written around the DELIKEOXIDE refractory grades — how they perform, where they win, and how to spec them.
Tell us your forming method, service temperature and Cr(VI) ceiling — we reply within one working day with grade, gradation and price.
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