NMJ-3 High-strength Wear-resistant Castable is a cement-based, single-component dry mortar designed for industrial applications requiring balanced wear resistance and thermal stability. Manufactured through an industrial process combining high-strength cement, mineral admixtures, premium refractory aggregates, and anti-cracking and wear-resistant agents, NMJ-3 delivers reliable mechanical strength and abrasion resistance suitable for moderate to severe service conditions.
Technical Specifications
| Parameter | Value |
|---|---|
| Al₂O₃ Content (%) ≥ | 80 |
| Bulk Density (g/cm³) ≥ | 2.9 |
| Cold Crushing Strength (MPa) ≥ | 110℃ × 24h: 1201100℃ × 3h: 130 |
| Modulus of Rupture (MPa) ≥ | 110℃ × 24h: 181100℃ × 3h: 20 |
| Permanent Linear Change (1100℃ × 3h, %) | -0.2 ~ 0 |
| Room Temperature Wear Volume (cm³) ≤ | 5 |
Key Features
Exceptional Wear Resistance: Provides superior resistance to abrasive and erosive wear, extending service life in high-wear zones.
High Mechanical Strength: Outstanding cold crushing strength ensures durability under mechanical stress.
Thermal Stability: Maintains structure and performance under high-temperature cycling.
Low Linear Shrinkage: Excellent dimensional stability at elevated temperatures.
Easy Installation: Delivered as a one-component dry mix, it can be installed by casting or vibrating without special equipment.
Typical Applications
Medium wear zones in circulating fluidized bed (CFB) boilers
Rotary kiln inlet ducts, risers, and downcomers
Back-up linings and transition layers in steel and cement plants
Cyclone separators, ash hoppers, and burner throats
Petrochemical incinerators and waste heat recovery units
Production Details
NMJ-3 is produced through:
High-strength calcium aluminate cement combined with mineral admixtures
Carefully graded refractory aggregates to optimize density and strength
Anti-cracking agents and additives to improve durability
Industrial mixing and packing under controlled humidity conditions for consistent quality
Packing and Shipping Details
Packaged in 25kg or 50kg multi-layer moisture-resistant kraft paper bags
Jumbo bags (1 ton) available for large orders
Palletized and shrink-wrapped for ease of transport and protection
Frequently Asked Questions (FAQ)
Q1: What installation methods are recommended?
Vibrated casting and hand casting are both suitable. Mix with clean water (5–7% by weight) for optimal performance.
Q2: How long before the castable can be heated?
Allow 24 hours of air curing, then follow a gradual drying and heating schedule to avoid spalling.
Q3. Can this castable handle direct flame exposure?
Yes, when properly cured and dried, NMJ castables resist direct flame and thermal cycling.
Q4: How do NMJ products differ?
Differences include alumina content, density, and wear resistance—NMJ-1 highest and NMJ-5 most economical.
Q5: Are customized formulations available?
Yes, tailored mixes and shapes can be produced based on your requirements.
