What is the primary acoustic performance metric in this standard?

The Noise Reduction Coefficient (NRC), which must meet minimum values as per Table 2.

Does this standard cover foam-based acoustic materials?

The standard is primarily intended for fibrous materials like mineral wool and glass wool, though its principles can be applied to other resilient materials.

How is the sound absorption measured?

The Sound Absorption Coefficient is measured in a reverberation chamber according to the method given in IS 8225, as referenced in Annex A.

What is the difference between Type 1 and Type 2 materials?

Type 1 materials have a higher acoustic performance requirement (NRC ≥ 0.70) compared to Type 2 materials (NRC ≥ 0.50), as defined in Table 2.

IS 15093

: 2002

Resilient sound absorbing materials for building applications - Specification

CurrentSpecializedSpecificationBIMArchitectural · Insulation Materials

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This standard specifies the requirements for resilient sound-absorbing materials, primarily fibrous types like mineral and glass wool, used for acoustical treatment in buildings. It classifies materials based on performance, defining their physical, acoustical (NRC), and fire safety properties, along with the necessary test methods.

Specifies requirements for resilient sound absorbing materials for building applications.

Quick Reference Values

Minimum Noise Reduction Coefficient (NRC) for Type 1 materials0.70

Minimum Noise Reduction Coefficient (NRC) for Type 2 materials0.50

Standard Test Frequencies for SAC125, 250, 500, 1000, 2000, 4000 Hz

Density Tolerance± 15 percent of nominal value

Fire Performance Classification (Highest)Class P (Non-combustible)

Maximum Thermal Conductivity0.045 W/m.K at 25°C

Key Formulas

NRC = (α250 + α500 + α1000 + α2000) / 4 — Noise Reduction Coefficient Calculation

Practical Notes

The Noise Reduction Coefficient (NRC) is an average value. For critical spaces like studios, always review the material's Sound Absorption Coefficient (α) across all specific frequency bands provided in the manufacturer's test certificate.

Ensure the specified fire performance class (e.g., Class P, Class 1) is suitable for the application area, particularly for ceilings, escape routes, and areas of public assembly, to comply with local fire safety regulations.

This is a material specification, not a design or installation guide. Proper installation methods, including air gaps and mounting types, are crucial to achieve the rated acoustic performance.