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CA50 CA70 CA80 Fire Resistant Cement: Properties, Differences and Industrial Applications
CA50, CA70, and CA80 fire resistant cement, commonly known as calcium aluminate cement (CAC), are professional hydraulic refractory binders widely used in modern industrial high-temperature lining projects. Different from ordinary Portland cement, these refractory cement grades are manufactured from high-purity bauxite and lime raw materials through high-temperature calcination and ultra-fine grinding. They feature rapid hardening, high early strength, excellent high-temperature stability, strong slag corrosion resistance and superior thermal shock resistance. As the core bonding material for refractory castables, mortars, gunning mixes and plastic refractories, CA series fire resistant cement covers low, medium and high-temperature working scenarios, meeting the diverse lining and repair needs of industrial furnaces, boilers and thermal equipment. This article elaborates on the core properties, grade differences, technical advantages and typical industrial applications of CA50, CA70 and CA80 refractory cement to help industrial users select the most suitable product.
Core Advantages of CA Series Fire Resistant Cement
All CA50, CA70 and CA80 fire resistant cement grades share the superior inherent performance of calcium aluminate cement, which makes them irreplaceable in high-temperature industrial fields. Firstly, they have fast setting and hardening speed and outstanding early strength development. The cement can reach stable mechanical strength in a short time after construction, realizing rapid demolding and quick startup of equipment, greatly shortening construction and maintenance cycles. Secondly, the products have excellent high-temperature resistance, with no softening or strength loss under long-term high-temperature operating conditions, and can maintain complete structural stability of the furnace lining. Thirdly, they possess strong resistance to molten slag, flue gas erosion and thermal shock, effectively avoiding lining cracking, peeling and damage caused by frequent temperature changes. In addition, CA series refractory cement has good construction adaptability, stable mixing performance, good compatibility with various refractory aggregates and additives, and is suitable for pouring, smearing, spraying and other various construction processes.
Detailed Introduction & Grade Differences of CA50, CA70, CA80 Fire Resistant Cement
The three mainstream grades are classified mainly based on alumina content, impurity indicators, refractoriness and service temperature. Each grade has targeted performance advantages and applicable scenarios, forming a complete high-temperature refractory bonding system.
CA50 Fire Resistant Cement (General-Purpose Grade)
CA50 is the most widely used general-grade calcium aluminate fire resistant cement, with an alumina content stably controlled between 50% and 53.5%. It has moderate setting time, excellent workability and stable construction performance, which is convenient for on-site operation and quality control. The refractoriness of CA50 cement is up to 1460℃, and the long-term safe service temperature is below 1300℃. This grade focuses on cost performance and basic refractory bonding performance, with reliable strength and good anti-aging performance in medium and low-temperature environments. It is the preferred conventional material for general industrial thermal equipment lining and routine maintenance.
CA70 Fire Resistant Cement (Medium-High Purity Grade)
As a high-cost-performance medium-high temperature refractory binder, CA70 is widely used in cement rotary kilns, steel reheating furnaces, industrial heating furnaces, petrochemical thermal reactors and other medium-high temperature equipment. It is suitable for preparing high-strength refractory mortars, anti-corrosion castables and furnace lining spraying layers, and is the mainstream material for industrial medium-high temperature furnace lining permanent layers and protective layers.
CA80 fire resistant cement is a high-end high-purity calcium aluminate cement in the series, with an alumina content of 78% to 81%. It is produced from ultra-high-purity industrial alumina and refined quicklime through precise batching and high-temperature calcination, with extremely low impurity content. This grade has ultra-high refractoriness and hot strength, with a long-term service temperature of more than 1750℃. It has outstanding resistance to strong slag erosion, high-temperature flue gas corrosion and extreme thermal shock, and can maintain stable structural performance in harsh high-temperature and high-corrosion working environments for a long time.
How to Choose the Right CA Series Fire Resistant Cement
In actual industrial procurement and construction, the core basis for grade selection is the equipment working temperature, operating environment and service requirements. For conventional low and medium-temperature furnaces, flues and boiler linings with low cost budget, CA50 fire resistant cement is the most economical and practical choice. For medium-high temperature industrial kilns and thermal equipment that require high strength and medium anti-corrosion performance, CA70 cement with balanced performance and cost is the best option. For ultra-high temperature, high corrosion and high wear working scenarios such as metallurgical key equipment and high-end industrial kilns, high-purity CA80 fire resistant cement must be selected to meet extreme operating requirements.
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