CA70 Refractory Cement is a high-purity calcium aluminate cement containing approximately 70% alumina (Al₂O₃). It is specially developed as a high-performance hydraulic binder for monolithic refractory applications requiring excellent mechanical strength, controlled setting behavior, and reliable high-temperature performance.

With its high calcium aluminate content and low impurity levels, CA70 Refractory Cement is widely used in low cement castables, ultra-low cement castables, self-flow castables, wet shotcrete, and other high-performance refractory formulations.

CA70 Refractory Cement is available in three grades: CA70, CA70W, and CA70S. Each grade is formulated with different setting and workability characteristics to meet different installation conditions and temperature requirements.

Physicochemical Parameters

Items	CA70 Typical	CA70 Limit	CA70W Typical	CA70W Limit	CA70S Typical	CA70S Limit
Workable Time	Moderate	—	Short	—	Longer	—
SiO₂ (%)	0.2–0.7	≤1.0	0.2–0.7	≤1.0	0.2–0.7	≤1.0
Al₂O₃ (%)	68.5–70.5	≥68	68.5–70.5	≥68	68.5–70.5	≥68
Fe₂O₃ (%)	0.1–0.5	≤0.7	0.1–0.5	≤0.7	0.1–0.5	≤0.7
CaO (%)	28.5–29.5	—	28.5–29.5	—	28.5–29.5	—
R₂O (%)	—	≤0.4	—	≤0.4	—	≤0.4
S (%)	—	≤0.1	—	≤0.1	—	≤0.1
Cl⁻ (%)	—	≤0.06	—	≤0.06	—	≤0.06
D50 (μm)	≤14	—	≤10	—	≤14	—
325 Mesh (%)	—	≤8.0	—	≤5.0	—	≤8.0
Specific Surface Area (m²/kg)	380–420	≥350	400–450	≥400	380–420	≥350
Initial Setting Time (min)	180–240	≥150	60–120	≥30	240–270	≥180
Final Setting Time (min)	240–300	≤360	120–180	≤240	300–360	≤360
Flexural Strength, 1d (MPa)	9.0–11.0	≥5.0	9.0–11.0	≥5.0	8.0–11.0	≥5.0
Flexural Strength, 3d (MPa)	11.0–12.0	≥6.0	11.0–12.0	≥6.0	11.0–12.0	≥6.0
Compressive Strength, 1d (MPa)	45–55	≥30	45–55	≥30	45–55	≥30
Compressive Strength, 3d (MPa)	55–65	≥40	55–65	≥40	60–70	≥40

Note: The above values are typical reference data. Actual product properties may vary according to raw materials, production conditions, testing methods, and refractory formulations. Customized technical specifications can be discussed according to customer requirements.

Product Features

High-Purity Calcium Aluminate Cement: CA70 contains approximately 70% Al₂O₃ and has relatively low impurity levels. This high-purity composition makes it suitable for high-performance refractory formulations requiring stable high-temperature properties.
Excellent Mechanical Strength: CA70-based refractory castables can achieve high flexural and compressive strength after curing. This makes the cement suitable for demanding monolithic refractory systems.
Suitable for Low Cement and Ultra-Low Cement Castables: CA70 is specifically recommended for low cement and ultra-low cement castables. Its compatibility with deflocculating systems provides flexibility when designing high-performance refractory formulations.
Different Setting Characteristics: CA70, CA70W, and CA70S provide different setting and working-time characteristics, allowing customers to select a suitable grade according to ambient temperature, installation method, and project requirements.
Good Workability: The controlled particle characteristics and rheological properties of CA70 support casting and gunning applications. CA70S is particularly designed for good fluidity and extended workable time.
Strong High-Temperature Performance: With high alumina content and calcium aluminate phases, CA70 provides reliable performance in high-temperature refractory applications and is suitable for demanding monolithic refractory systems.
Good Additive Compatibility: CA70 provides good compatibility with various additives used in deflocculated refractory systems, helping refractory manufacturers optimize water addition, flowability, setting behavior, and mechanical performance.
Seasonal Application Options: CA70W is suitable for lower-temperature conditions and rapid installation, while CA70S is designed for longer workable time in high-temperature or hot-weather conditions.

Applications

CA70 Refractory Cement is widely used in high-performance monolithic refractory applications, including:

Low Cement Castables: Used as a high-purity hydraulic binder for low cement refractory castables.
Ultra-Low Cement Castables: Suitable for advanced castable formulations requiring controlled hydration and excellent mechanical performance.
Self-Flow Castables: Provides reliable bonding and workability in self-flowing refractory systems.
Wet Shotcrete: Suitable for wet shotcrete materials used in furnace lining construction and repair.
High-Performance Refractory Castables: Used in refractory formulations requiring high strength and high-temperature stability.
Furnace Linings: Suitable for monolithic refractory linings in industrial furnaces and thermal equipment.
Kiln Linings: Can be used in castable formulations for different industrial kiln applications.
Refractory Maintenance: Suitable for selected repair and maintenance materials requiring rapid or controlled hardening.
Gunning Applications: The rheological properties of suitable CA70 grades support gunning installation methods.

The appropriate grade should be selected according to the required working time, ambient temperature, installation method, refractory aggregate, additive system, curing conditions, and service temperature.

Customization Services

Xintai Refractory can supply CA70 series calcium aluminate cement for different refractory formulations and industrial applications.

Customized requirements can be considered based on:

Required Al₂O₃ content
SiO₂ and Fe₂O₃ limits
Setting time
Workable time
Specific surface area
Particle size distribution
Early strength requirements
Flexural strength
Compressive strength
Refractory aggregate compatibility
Deflocculant and additive system
Casting or gunning method
Ambient temperature
Required service temperature
Packaging requirements

For large-volume orders and industrial refractory projects, Xintai can provide technical specifications, samples, customized packaging, and recommendations for selecting CA70, CA70W, or CA70S according to the customer’s formulation and operating conditions.

Packing and Shipping Details

Packing: Available in moisture-resistant bags, buckets, or other suitable containers according to product formulation and customer requirements.
Standard Packaging: Common industrial packaging can be supplied for regular orders.
Customized Packaging: Private labeling, customized bag sizes, and project-specific packaging can be provided upon request.
Storage: Store in a dry, cool, and well-ventilated location. Protect the product from moisture and keep packaging properly sealed before use.
Shipping: Suitable for sea, air, and road transportation depending on order quantity and destination.
Export Service: Professional export packaging and documentation can be provided for international orders.

About Xintai Refractory

Xintai Refractory is a professional manufacturer and supplier of refractory materials and high-temperature solutions. The company supplies high alumina bricks, fireclay bricks, insulation bricks, refractory cement, castables, calcium aluminate cement, and other customized refractory products.

CA70 Refractory Cement is available in CA70, CA70W, and CA70S grades to meet different refractory formulation and installation requirements.

With factory-direct manufacturing, controlled raw material selection, quality inspection, customized product solutions, and international export capabilities, Xintai Refractory provides refractory materials for steel, cement, ceramic, glass, chemical, non-ferrous metal, and other high-temperature industries.

Contact Xintai Refractory for CA70 Refractory Cement A70, CA70W, and CA70S, factory pricing, technical specifications, samples, customized formulations, and bulk supply solutions.