NMJ-2 High-strength Wear-resistant Castable is a cement-based, one-component dry mortar formulated for industrial applications requiring outstanding abrasion resistance and mechanical durability. It is manufactured using high-strength aluminate cement, carefully selected mineral admixtures, wear-resistant aggregates, and anti-cracking additives. The result is a high-performance castable that combines excellent thermal shock resistance with superior strength, suitable for high-wear zones in boilers, kilns, and metallurgical equipment.
Technical Specifications
| Parameter | Value |
|---|---|
| Al₂O₃ (%) ≥ | 80 |
| Bulk Density (g/cm³) ≥ | 3.0 |
| Cold Crushing Strength (MPa) ≥ | 110℃ × 24h: 1201100℃ × 3h: 130 |
| Modulus of Rupture (MPa) ≥ | 110℃ × 24h: 201100℃ × 3h: 23 |
| Permanent Linear Change (1100℃ × 3h, %) | -0.2 ~ 0 |
| Room Temperature Wear Volume (cm³) ≤ | 3.5 |
Key Features
Enhanced Wear Resistance: Specifically engineered to resist abrasive wear in high-flow and high-impact zones.
Dual-Stage Strength: Excellent mechanical performance at both ambient and elevated temperatures.
Stable Volume Performance: Minimal shrinkage or expansion under high-heat firing.
Vibration Casting Friendly: Optimized for easy installation via vibration or hand casting.
Reliable Thermal Cycling Performance: Performs stably across repeated heat-ups and cool-downs.
Typical Applications
High-wear areas in circulating fluidized bed (CFB) boilers
Rotary kiln inlet and riser ducts in cement and lime production
Iron and steel furnace walls and slag zones
Ash hoppers, burner throats, and cyclone separators
Petrochemical incinerators and waste heat recovery units
Production Details
NMJ-2 is produced through a highly controlled manufacturing process, including:
Precision blending of high-purity raw materials
Micronized mineral additives for improved bonding and heat resistance
Wear-resistant aggregates for long-term performance in mechanical wear zones
Automated packing and moisture control to ensure product consistency
All batches are tested for key parameters such as compressive strength, abrasion resistance, and dimensional stability before dispatch.
Packing and Shipping Details
Packaging: 25kg or 50kg kraft paper sacks with moisture barrier
Optional: Jumbo bags or customized labels available
Storage: Store in dry, well-ventilated conditions; avoid moisture contact
Frequently Asked Questions (FAQ)
Q1: What is the recommended water addition for NMJ-2 during installation?
Generally, 5–7% of clean water by weight of dry castable is recommended. However, the exact amount may vary slightly based on environmental conditions and casting method. Over-watering should be avoided to maintain strength and wear resistance.
Q2: Can NMJ-2 be used in direct flame contact zones?
Yes. NMJ-2 is designed to withstand high-temperature environments, including areas exposed to direct flame and hot gas flows. Proper curing and pre-heating procedures must be followed before service.
Q3. What kind of installation method is suitable for NMJ-2?
NMJ-2 is ideal for vibrating casting and hand casting. It flows well when mixed properly and compacts to a dense, durable structure with minimal porosity.
Q4: How long does it take for NMJ-2 to dry and cure before it can be heated?
After casting, NMJ-2 should be air-cured for at least 24 hours, followed by controlled drying at increasing temperatures to remove residual moisture. The drying curve typically includes stages at 110°C, 300°C, and above. Consult our technical team for a detailed heating schedule.
Q5: Is NMJ-2 customizable for special applications?
Absolutely. We can adjust particle size distribution, binder composition, or wear-resistant additives to meet your specific operating conditions and installation methods.
