Calcium Aluminate Cement CAC 70
Calcium Aluminate Cement CAC 70 is a specialized hydraulic cement where the primary active components are high-alumina calcium aluminates (CA, CA₂). The cement is processed to minimize fluxing impurities like iron and silica.
The 70% grade refers to the typical Al₂O₃ content (approximately 68% to 72%). This higher purity and alumina content dramatically increase the cement’s refractoriness and chemical inertness compared to the CAC 50% grade. It is the primary binder used in Low-Cement Castables (LCC) and Ultra-Low Cement Castables (ULCC).
Main Function and Characteristics
CAC 70% is a high-purity binder that imparts the required hydraulic set and maintains high-temperature stability, enabling the use of high-alumina aggregates.
| CHARACTERISTIC | VALUE RANGE | PRIMARY REFRACTORY FUNCTION |
|---|---|---|
| Alumina (Al₂O₃) Content | ~70% | Significantly increases the thermal stability and service temperature. |
| PCE (Refractoriness) | >1650°C | Allows for higher service temperature applications. |
| Impurity Level (Fe₂O₃/SiO₂) | LOW | Minimizes the formation of low-melting-point glass phases. |
CLASSIFICATION
- Binding Focus: High-Alumina Hydraulic Binder – Forms stable crystalline hydrates with high purity.
- Primary Application Focus: Low-Cement Castables (LCC) and High-Duty Repair Mortars.
Key Performance Metrics
| PROPERTY | TYPICAL PERFORMANCE | MECHANISM OF ADVANTAGE |
|---|---|---|
| Refractoriness | SUPERIOR | Maintained due to low flux content, allowing use with high-grade aggregates. |
| Hot Strength | HIGH | The high alumina content promotes strong ceramic bonding at high temperatures. |
| Chemical Inertness | VERY GOOD | Better resistance to chemical attack (e.g., carbon monoxide disintegration) than 50% grade. |
Calcium Aluminate Cement CAC 70
- The Role in Low-Cement Castables
The CAC 70% grade is critical for modern LCC and ULCC formulations:
- Cement Reduction: LCC castables use 5% to 10% cement, and ULCC use 2% to 5% cement, dramatically less than conventional castables (which use 15% to 30%).
- Performance Improvement: By reducing the cement content, the overall amount of impurities (SiO₂ and CaO) is also reduced. Since these impurities are the main cause of low-temperature melting and hot creep, their reduction leads to a massive improvement in the final refractory’s high-temperature performance, making the final product closer to a high-purity brick.
- Binding: In LCC/ULCC systems, the fine CAC 70% powder works in conjunction with ultra-fine reactive SiO₂ (silica fume) and optimized PSD aggregates to create both the initial hydraulic bond and the final ceramic bond.
- Comparison to CAC 50%
The CAC 70% grade offers significantly better performance than CAC 50% in critical applications:
- Maximum Service Temperature: The higher Al₂O₃ content in CAC 70% means the softening point of the cement itself is much higher, allowing the castable to maintain its structural integrity up to higher temperatures.
- Purity: The reduced Fe₂O₃ content makes the CAC 70% suitable for applications where carbon monoxide (CO) disintegration is a risk, as iron oxide is a catalyst for the reaction (2CO → C + CO₂), which destroys the refractory structure.
- Technical Guidance
- Installation: LCC/ULCC mixes containing CAC 70% require very low water content and often necessitate the use of specialized chemical dispersants (de-flocculants) to achieve flowable consistency. This process requires precise control and expert mixing.
✨ Customization Services
We offer product customization services, allowing you to tailor the appearance, dimensions, or specific markings of items like refractory shapes or bricks. This includes options for incorporating specific geometric requirements to ensure seamless integration into your process systems.
🔬 Sampling for Testing & Validation
Free product samples are available for thorough testing and validation. This allows you to confirm the quality, compatibility, and performance of our materials—such as specific bricks, castables, or raw materials—before committing to a full order.
💡 Expertise in Refractory Solutions
Leverage our deep expertise to receive detailed, application-specific refractory solutions. We move beyond just selling products by providing comprehensive plans that encompass material selection, installation guidance, and performance optimization to maximize the lifespan and efficiency of your high-temperature processes.
Rabatec products are exclusively manufactured in facilities that have achieved rigorous ISO certifications across Quality (ISO 9001), Environmental Management, and Occupational Health & Safety. This commitment ensures every product, from refractory bricks to specialized equipment, meets the highest global benchmarks for performance, sustainability, and workplace safety.
📦 Logistics Excellence: Shipping, Packaging, and Marking
Minimizing Risk: We manage all logistics to minimize handling touchpoints and transit shock. Our carriers are pre-vetted for their experience in transporting heavy, fragile, and sensitive industrial materials.
Traceability: Every shipment includes comprehensive documentation and tracking information, providing end-to-end visibility and ensuring precise delivery coordination for your site.
Protection is Paramount: Our packaging strictly follows industry standards to prevent damage, corner chipping, and moisture absorption—especially critical for materials like Basic Refractory Bricks and Refractory Mortars & Mixes.
Robust Palletization: Products are secured on fumigated, high-strength export pallets (e.g., 1100x950mm or similar sturdy dimensions) using heavy-duty strapping and durable protective wrapping (polyethylene sheeting, cardboard, etc.) to withstand long-distance travel and multiple loadings.
Moisture Control: Sensitive materials are protected with appropriate sealing and, where necessary, desiccants or moisture-vapor proof enclosures to maintain the product's integrity until installation.
Clear Identification: All outer packaging is clearly marked on multiple sides with large, legible text for immediate identification and safe handling.
Full Traceability: Markings include all essential data points: Product Name, Quality Grade, Batch Number, Quantity, Net/Gross Weight, Order Number, and the Final Destination/Construction Area. This ensures every pallet can be accounted for and correctly staged upon arrival.
Safety & Compliance: We adhere to all regulatory requirements for marking, labeling, and placarding—especially for any items classified as Dangerous Goods—to ensure full compliance with international and domestic transport regulations.
❓ Frequently Asked Questions (FAQ)
Question | Elaborated Answer |
Q: What is the Refractoriness Under Load (RUL) of your refractories? | A: Refractoriness Under Load (RUL) is a critical property that defines the maximum temperature our materials can withstand while under compressive stress before deforming (softening). Since we offer a wide range of materials—from Alumina-Silicate Bricks to high-performance Silicon Carbide Bricks—the RUL varies significantly. For specific product data, please refer to the product data sheet or submit a quote request for the material you are interested in. |
Q: Where are the Rabatec refractories and materials produced? | A: Our products are primarily sourced from specialized manufacturing plants in China. Crucially, these facilities have all undergone rigorous audits and achieved comprehensive ISO certifications (Quality, Environment, and Safety), ensuring that production adheres to the highest global standards for consistency and performance. |
Q: What refractory materials does the company offer? | A: We supply a comprehensive portfolio of advanced refractory solutions, including: Shaped Products: Alumina & Silica Bricks, Basic & Specialized Bricks (e.g., Magnesia), SiC & Structural Ceramics, and Precast Shapes. Monolithic Products: Refractory Castables, Mixes & Mortars. Insulation: Insulation Fibre and High-Performance Insulation Products. |
Q: How should I choose the appropriate refractory material for my application? | A: Selecting the correct refractory is paramount to process efficiency. The choice depends on three key factors: 1. Operating Environment: Maximum process temperature and thermal cycling (shock). 2. Chemical Attack: Type of slag, molten metal, or corrosive gas being handled (acidic, neutral, or basic). 3. Mechanical Stress: Abrasion, erosion, and static load requirements. We recommend utilizing our detailed refractory solutions service to consult with our engineers for an optimized, application-specific recommendation. |
Q: Which monolithic material should I choose when patching an existing lining? | A: For patching and minor repairs, the ideal monolithic material depends on the parent lining material, the patching depth, and the need for a rapid return to service. Common choices include: Refractory Mortars & Mixes (for minor joints/surfaces) or Plastic Refractories (for areas requiring physical compaction). Always choose a patch material chemically compatible with the existing lining to ensure proper bonding and service life. |
Q: Can I receive product samples before placing a major order? | A: Yes. We gladly provide product samples for your internal testing and validation purposes. This ensures you can confirm the quality, composition, and fit of the material—such as our Refractory Castables or Alumina-Silicate Bricks—in your specific operational environment before committing to a bulk purchase. |
Q: Do you provide certifications to verify material quality? | A: Absolutely. We provide product-related inspection certificates and quality assurance documentation upon request. This verifies that your order has passed all internal quality control checks and meets the required material specifications and industry standards. |
Q: What measures are taken for product protection during transport? | A: We ensure quick, reliable transport by using robust, industrial packaging that strictly follows industry standards. This includes high-strength palletization, heavy-duty strapping, and weather-resistant wrapping to protect fragile items like bricks and mixes from corner chipping, mechanical damage, and moisture during transit. |
