Trowelable refractories

Trowelable refractories are a kind of castable refractory mortar with a consistency that makes it easy to trowel into place—very useful for patching and for shaping complex surfaces. 

Refractory mortars are finely ground refractory materials that, when tempered with water, become trowelable for bonding layed-up refractory shapes. 

Sometimes misunderstandings occur between the bricklayers and the producers of SiC-based castables. In the language of refractory producers, a castable that should be installed in the cavity of a steel shell is called a troweling mix, but bricklayers at smelters continue to call it a ramming mix. This latter term is more likely for the composition that is filled in between the deck plate and the upper part of an SiC block (Fig. 2.76). 

Coatings Coatings are mixtures of fine refractory aggregates and bonds. They contain higher water content than mortars and are supplied in a ready-to-use form. The bonds may be ceramic, hydraulic, chemical, or organic. They can be applied manually, pneumatically, by mechanical projection, or by spraying. Manual application involves the use of a brush or trowel. 

Coatings. These products are mixtures of fine refractory aggregates and bond(s). They are usually supplied ready-for-use with a higher water or liquid content than is required for mortars. They are often designated as coatings and may have a ceramic, hydraulic, chemical, or organic bond. The mixmres are applied manually (with a brush or trowel), by pneumatic or mechanical projection, or also by spraying. 

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