IS 12027:1987 is the Indian Standard (BIS) for silicone-based water repellents. 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
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Silicone Content (Ready-to-use) | Minimum 5% by mass | Not specified; performance-based standard | EN 1504-2:2004 |
| Capillary Water Absorption | Treated specimen absorption must be ≤ 10% of untreated specimen | Absorption coefficient < 0.1 kg·m⁻²·h⁻⁰.⁵ AND absorption rate < 7.5% compared to control | EN 1504-2:2004 |
| Depth of Penetration | Minimum 2 mm (on sandstone) | Class I: < 10 mm; Class II: ≥ 10 mm (on concrete) | EN 1504-2:2004 |
| Water Vapour Permeability | Drying rate must be ≥ 80% of untreated specimen | Must be Class I (highly permeable): Sd < 5 m | EN 1504-2:2004 |
| Alkali Resistance Test | Retain repellency after 21 days in saturated lime water | Performance criteria (e.g., capillary absorption) must be met after exposure to a defined alkaline solution (e.g., KOH/NaOH) | EN 1504-2:2004 |
| Flash Point (Solvent-based) | Minimum 30°C | Not specified in the standard; covered by separate chemical safety regulations (CLP) | EN 1504-2:2004 |