IS 15474:2004 is the Indian Standard (BIS) for rock wool thermal insulating materials. This standard specifies the requirements for various forms of rock wool thermal insulation, including loose fill, bonded slabs, and resin-bonded mattresses. It defines classifications based on density and service temperature, and outlines mandatory physical properties such as thermal conductivity, shot content, and fire resistance. The code serves as a procurement and quality assurance benchmark for rock wool used in thermal and acoustic applications.
Specifies requirements for rock wool thermal insulating materials.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Thermal Conductivity (λ) for 100 kg/m³ slab at 50°C | Max 0.040 W/(m·K) | Manufacturer declared value (λD), typically 0.035-0.040 W/(m·K). No fixed maximum is set by the standard. | EN 13162:2012+A1:2015 |
| Classification Basis | Prescriptive, based on density (e.g., 48, 64, 80, 96 kg/m³ etc.) and form. | Performance-based designation codes for properties like thermal resistance, strength, and stability. | EN 13162:2012+A1:2015 |
| Maximum Service Temperature | Up to 750°C for material without facing. | Classified by Types. e.g., Type V is rated for 1200°F (649°C). | ASTM C612-14(2021) |
| Fire Classification | Deemed 'Non-combustible' per IS 3144 test. | Euroclass A1 (non-combustible) or A2-s1,d0 as per EN 13501-1. | EN 13162:2012+A1:2015 |
| Thickness Tolerance (Slabs < 100kg/m³) | -2 mm, +4 mm | Depends on declared class. e.g., Class T4: -1% or -1mm / +5% or +3mm. | EN 13162:2012+A1:2015 |
| Compressive Strength (Stress at 10% deformation) | Min 10 kPa for 128 kg/m³ slabs. | Declared level, e.g., CS(10)10 requires a minimum of 10 kPa. | EN 13162:2012+A1:2015 |