Fireclay brick adalah alumina silicate brick dengan kandungan 35-40%.
Ada beberapa grade fireclay bricks refractories yaitu:
| 1. | Firebrick SK-32 Refractoriness point: 1250 °C Normal size: 230 x 114 x 65mm |
| 2. | Firebrick SK-33 Refractoriness point: 1300 °C Normal size: 230 x 114 x 65mm |
| 3. | Firebrick SK-34 Refractoriness point: 1350 °C Normal size: 230 x 114 x 65mm |
Digunakan di incinerator, reheating furnace, blast furnace dan general furnace.
