Magnesia Plastic Refractory
Magnesia Plastic Refractory are classified as Basic Refractories.1 They are composed primarily of high-purity Magnesia (MgO) aggregate (Periclase or Dead-burned Magnesia), along with plasticizing agents (such as graphite, pitch, or resins) and a chemical binder to promote high green strength and stable sintering at high temperatures.
| COMPONENT | CONTENT | CHEMICAL BASE | PRIMARY ADVANTAGE |
| Aggregate | MgO (~85% to 95%) | High-Purity Periclase | Maximum basicity and extreme refractoriness |
| Plasticizer | Water/Resins/Pitch | Organic/Inorganic | Allows high plasticity for ramming installation |
| Binder | Chrome/Phosphate/Organic | Chemical bond | High green strength and superior high-temperature coking/sintering |
| VARIANT | KEY ADDITIVE | PRIMARY APPLICATION FOCUS |
| Magnesia-Carbon | Graphite/Resin | Excellent slag resistance and non-wetting to metal |
| Magnesia-Chrome | Cr2O3 | Improved spalling resistance and slag penetration resistance |
Key Properties and Performance
| PROPERTY | TYPICAL PERFORMANCE | MECHANISM OF ADVANTAGE |
| Chemical Resistance | EXCELLENT (Basic) | Highly stable against CaO– and MgO-rich basic slags, preventing chemical dissolution. |
| Refractoriness Under Load (RUL) | EXTREME | MgO has a melting point of 2800°C, ensuring structural stability above 1800°C. |
| Installation | RAMMING | Achieves high density (> 2.8 g/cm3) and a seamless lining. |
| Thermal Shock | GOOD | Enhanced by additives (like Carbon or Chrome) to handle rapid temperature changes. |
Magnesia Plastic Refractory
Advantages and Key Characteristics
Magnesia-Based Plastic Refractories are crucial maintenance and construction materials for basic steelmaking, where contact with highly corrosive CaO-rich slag is continuous.
- Maximum Basic Slag Resistance: The MgO base is chemically compatible with the basic slags used in steel refining. It resists chemical attack and dissolution far better than neutral (Alumina) or acidic (Silica) refractories, which would flux rapidly.
- Ease of Monolithic Repair: The plastic nature allows the material to be rammed into place quickly to form a seamless, dense, and joint-free patch or lining in complex geometries (e.g., tap holes, spouts, or ladle lips), minimizing furnace downtime.
- Structural Stability at Ultra-High Temperatures: Used in high-heat zones, the high refractoriness of Magnesia, combined with the dense packing achieved by ramming, ensures that the lining maintains its structural integrity and profile under extreme load.
- Toughness and Impact Resistance: The dense, often chemically bonded, structure provides high resistance to impact and mechanical abrasion common during charging and deslagging operations.
Typical Industries and Applications
This product is specialized for basic metallurgical processes:
- Ferrous Industry (Steel): Repairing Electric Arc Furnace (EAF) tap holes and spouts, patching the MgO working lining of EAF and Ladle Furnaces (LF), and relining BOF vessels.
- Non-Ferrous Industry: Used in specific refining vessels or furnaces where the process slag is basic.
Furnace Areas and Service Zones
They are specified for critical, high-wear, and basic chemical-contact zones:
- EAF TAP HOLES/SPOUTS: Exposed to molten steel, slag, and mechanical erosion during tapping.
- LADLE SLAG LINE: Used to repair the working lining where the basic slag is most corrosive.
- BURNER/LANCE PORTS: Used to form durable, chemically inert ports in basic furnace linings.
Key Data Sheet Properties to Consider
Selection criteria focus on chemical purity, density, and bond:
- MgO Purity: CRITICAL VALUE. Must be high (> 85%) for maximum slag resistance. Low SiO2 content is necessary to limit fluxing.
- Rammed Bulk Density (RBD): Look for the required installation density (> 2.8 g/cm3) to confirm a low-porosity lining is achieved.
- Bonding System: Understand if the bond is sensitive to moisture (organic) or high heat (ceramic). Organic bonds require venting for smoke/coking during heat-up.
- Volume Stability: Must demonstrate minimal shrinkage after high-temperature firing.
Technical Guidance: Like all plastic refractories, successful application requires high-energy pneumatic or manual ramming to achieve the necessary density. They also require a controlled initial dry-out and heat-up schedule to safely remove moisture and develop the final, permanent ceramic/sintered bond.
✨ 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. |
