The addition of a small amount of borate to the clay body of bricks or roof tiles delivers a number of benefits. Due to its fluxing properties borates can reduce the kiln firing temperature and increase production capacity. Borates also increase the strength of the fired article and enhance its colour and durability by forming a glaze on the surface.
Certain types of brick clay are prone to scumming and efflorescence which is due to the migration of soluble sulphate to the surface of the brick during drying and later when the bricks are exposed to natural weather conditions. This migration results in the appearance of aesthetically undesirable stain and white encrustation on the surface of the brick. The addition of borates can inhibit the migration of the soluble sulphate to the surface and prevent scumming and efflorescence.
Aqueous borate suspensions are the ideal additives for this application as they can readily be mixed in with the clay body. If you are interested in testing the borate suspension in this application, please contact our technical team to discuss your needs.