shaped refractory material
Dense Fireclay Brick
Dense fireclay brick, also called fireclay refractory brick, is an acid dense fired refractory brick. It uses hard fireclay clinker as the aggregate and soft fireclay as the binder, shaped under high pressure and fired at 1250‑1300℃. With an Al₂O₃ content of 30‑45%, it is the most basic and cost-effective general-purpose refractory working brick.
| Grade | Al₂O₃ Content | Long-term Service Temp. | Typical Applications |
| NZ‑35 | ≥35% | 1250‑1300℃ | Economy grade |
| NZ‑40 | ≥40% | 1300‑1350℃ | Mainstream market grade |
| NZ‑45 | ≥45% | 1350‑1400℃ | Premium fireclay brick |