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Dispersing Aluminas

Dispersing Aluminas

Dispersing agents are commonly used to de-agglomerate the fine particles of the matrix. The matrix of refractory low cement castables contains fine and ultra-fine particles such as calcium aluminate cement, reactive aluminas and silica fume. It is essential that all the matrix components are homogeneously distributed during mixing with water to take full advantage of the optimized particle size distribution, and achieve the lowest water demand and desired rheological behavior.

Almatis dispersing aluminas are very efficient additives for optimizing properties of castables. When compared to traditional dispersing agents such as phosphates, the water demand can be significantly reduced to provide improved mechanical properties and better corrosion resistance.

A unique feature of Almatis dispersing aluminas is the possibility of adjusting the setting time of castables, according to specific placement requirements and climatic conditions, without sacrificing the final strength development as is the case for other common additives for set control.

There are two different product lines of dispersing aluminas available for individual castable concepts:

• ADS 1 / ADS 3 / ADW 1 for high performance silica-free castables with alumina fines, and

• M-ADS 1 / M-ADS 3 / M-ADW 1 for fumed silica-containing castables using alumina fines.

ADS 1

For silica fume-free castables
Retarding component

ADS 3

For silica fume-free castables
Strong retarding component

ADW 1

For silica fume-free castables
Accelerating component

M-ADS 1

For silica fume containing castables
Retarding component

M-ADS 3

For silica fume containing castables
Strong retarding component

M-ADW 1

For silica fume containing castables
Accelerating component

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