IS 15588:2005 is the Indian Standard (BIS) for silicone based sealants for construction - specification. This standard specifies the requirements and test methods for single-component, gun-grade, silicone-based sealants used in construction joints. It classifies sealants based on their movement accommodation factor and details performance criteria for adhesion, cohesion, durability, hardness, and curing characteristics.
Specifies requirements for one-part and two-part silicone based sealants for use in building and civil engineering constructions.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Slump / Flow (Non-Sag) | ≤ 3 mm | ≤ 3.2 mm (0.125 in) for Grade NS (Non-Sag) | ASTM C920 (Test Method C639) |
| Hardness (Shore A, 28 days cure) | 15 to 30 | No mandatory value; must be reported by manufacturer. Typical values for a Class 25 silicone are 15-30. | ASTM C920 (Test Method C661) |
| Tack-Free Time | ≤ 60 minutes | No mandatory value; must be reported by manufacturer. Typical values are 30-60 minutes. | ASTM C920 (Test Method C679) |
| Adhesion & Cohesion (Cyclic Movement) | No failure after 10 cycles at ±25% | No adhesive or cohesive failure after 10 cycles at the specified Class (e.g., ±25%) | ASTM C920 (Test Method C719) |
| Elastic Recovery | ≥ 70% | ≥ 70% for elastic sealants (Class F & G) | ISO 11600:2002 (Test Method ISO 7389) |
| Weight Loss after Heat Ageing | ≤ 10% | ≤ 10% | ASTM C920 (Test Method C1246) |
| Staining of Porous Substrate | Stain Index ≤ 3 | No pass/fail value in C920; rated on a scale of 0-5. Non-staining sealants are expected to have a low rating. | ASTM C1248 (referenced for non-staining claims) |