Difference Between Refractory Castable and Refractory Cement
发布时间：2026-05-06
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Refractory castable is a finished mixed material containing aggregates (similar to "refractory concrete"), while refractory cement is a pure cementitious powder (aluminate cement). The former can be directly mixed with water for monolithic furnace lining casting, whereas the latter is only used as a binder or for preparing mortar.
1. Nature & Composition
Refractory Castable
Composition: Refractory aggregates (70–80%) + fine powder + binder (usually refractory cement) + additives
Form: Dry mixture of particles and fine powder; forms flowable slurry after mixing with water
Refractory Cement (Aluminate Cement / High-Alumina Cement)
Composition: Pure calcium aluminate fine powder (Al₂O₃ content: 50–80%), no coarse aggregates
Form: Ultra-fine powder (＜200 mesh), functioning only as a cementing agent
2. Key Performance Comparison
| Item | Refractory Castable | Refractory Cement |
|---|---|---|
| Maximum Service Temperature | 1300–1800℃ (varies by material grade) | 1400–1600℃ |
| Cold Compressive Strength | 30–100 MPa | 20–50 MPa |
| Core Advantages | High overall strength, slag & abrasion resistance, excellent thermal shock resistance | Rapid hardening & early strength, strong adhesion, suitable for low-temperature construction |
| Construction Method | Pouring, vibration & self-flowing; requires curing and baking | Used for mortar/concrete batching, bonding and patching |
3. Application Differences
Refractory Castable
Refractory Cement
Used as a binder: For compounding refractory mortar and refractory concrete (additional aggregates required).
Used for bonding & repairing: Laying refractory bricks, filling brick joints and small-area furnace lining repairs.
Emergency maintenance and winter construction (high hydration heat release).
4. Summary in Brief
Castable = Aggregates + Cement + Additives: Ready-to-use material for integral high-strength high-temperature furnace linings.
Refractory Cement = Pure cementitious powder: Cannot be used alone for structural layers; mainly for brick bonding, mortar mixing and local patching.
