Can silicate mortar be used in alkaline environments?

No, silicate mortars are not resistant to alkalis and will degrade. They are designed for acidic or neutral conditions.

What is the recommended joint thickness for acid-resistant brickwork?

Joints should be between 3 mm and 5 mm to minimize chemical attack on the mortar surface.

Does silicate mortar require water curing?

No, it requires dry air curing at ambient temperatures for at least 7 days. Water exposure before fully setting will ruin the mortar.

Is it suitable for hydrofluoric acid applications?

No, silicate-based materials are violently attacked by hydrofluoric acid and its salts.

IS 4441

: 1980

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

CurrentSpecializedCode of PracticeMaterials Science · Flooring, Wall Finishing and Roofing

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This standard provides guidelines for the proper storage, mixing, application, and curing of silicate-type chemical-resistant mortars. These mortars are primarily used for laying acid-resistant bricks and tiles in industrial flooring, chemical tanks, and chimneys.

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

Quick Reference Values

Recommended joint thickness3 mm to 5 mm

Minimum dry curing time7 days

Ideal application temperature15°C to 30°C

Maximum concrete substrate moisture4 percent

Practical Notes

Silicate mortars are highly susceptible to moisture; water must be strictly avoided during application and the entire curing process.

They provide excellent resistance to most acids (except hydrofluoric acid) but degrade rapidly in alkaline environments.

Joints should be kept as thin as possible (usually 3-5 mm) to minimize the exposed mortar area.

Acid washing with a mild hydrochloric acid solution is often required after curing to fully complete the chemical setting process.