What is the minimum required silicone content for a repellent to comply with this standard?

A minimum of 5.0 percent by mass is required as per Table 1.

What is the main performance test for this material?

The key performance tests are the water absorption test (max 5% absorption after 24h) and the depth of penetration test (min 2 mm on concrete block) as specified in Table 1.

Is this material film-forming?

No, it is a penetrative treatment. The standard specifies it should not leave any oily or greasy appearance after application and should be non-staining.

What is the required drying time?

The surface should be dry in a maximum of 4 hours, as per Table 1.

IS 12027

: 1987

silicone-based water repellents

CurrentSpecializedSpecificationMaterials Science · Waterproofing and Damp-Proofing

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This standard lays down the requirements and test methods for silicone-based water repellent solutions used for application on masonry and concrete surfaces. It covers essential properties such as silicone content, flash point, drying time, pH, and performance criteria like water absorption and depth of penetration.

silicone-based water repellents

Quick Reference Values

Minimum silicone content, percent by mass5.0

Minimum flash point (Abel)30 °C

Maximum drying time, surface dry4 hours

Maximum water absorption after 24 hours immersion5.0 %

Minimum depth of penetration on concrete block2 mm

pH value6.0 to 8.0

Practical Notes

This is a water repellent, not a waterproofing membrane. It works by lining pores to repel water and is not suitable for bridging cracks or withstanding hydrostatic pressure.

The substrate must be thoroughly clean, dry, and free of any contaminants or efflorescence before application to ensure proper penetration and performance.

Pay close attention to the flash point (30°C min) for safety during storage and application, especially in poorly ventilated areas.