What happens if sulphur mortar is heated above 160°C?

The mortar thickens rapidly, becomes highly viscous, difficult to pour, and the risk of ignition increases significantly.

Can sulphur mortar be applied to damp surfaces?

No, moisture trapped under molten mortar will boil into steam, causing porosity, bubbling, and poor adhesion.

How should a sulphur mortar fire be safely extinguished?

Smother the fire by placing a tight-fitting metal lid over the melting pan to cut off the oxygen.

What is the proper method to pour the molten mortar?

It should be poured using a ladle into joints of about 6 mm width while maintaining a temperature between 135°C and 150°C.

IS 4442

: 1980

Code of practice for the use of sulphur-type chemical-resistant mortars

CurrentSpecializedCode of PracticeMaterials Science · Flooring, Wall Finishing and Roofing

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This code covers the recommended practices for the preparation, safe handling, melting, and application of sulphur-type chemical-resistant mortars used for laying acid-resistant bricks or tiles in industrial environments.

Code of practice for the use of sulphur-type chemical-resistant mortars

Quick Reference Values

ideal pouring temperature135°C to 150°C

maximum safe heating temperature160°C

typical joint thickness6 mm

Practical Notes

Sulphur mortar must never be heated directly over an open flame without continuous stirring to prevent localized overheating, viscosity increase, and fires.

Ensure the brick or tile surface is completely dry before application; moisture causes molten sulphur to bubble and creates weak, porous joints.

If the mortar catches fire in the pan, extinguish it by covering the vessel with a tight lid to cut off the oxygen supply; never use water.