This standard details the specifications for fibre insulation boards crafted from wood or sugarcane fibres, mainly employed for thermal and acoustic insulation. It outlines requirements related to size, permissible deviations, physical characteristics, flame resistance treatments, and testing procedures to guarantee quality and safety. The guideline is crucial for manufacturers, suppliers, and engineers working with fibre insulation materials in construction and industrial environments.
Overview
This standard details the specifications for fibre insulation boards crafted from wood or sugarcane fibres, mainly employed for thermal and acoustic insulation. It outlines requirements related to size, permissible deviations, physical characteristics, flame resistance treatments, and testing procedures to guarantee quality and safety. The guideline is crucial for manufacturers, suppliers, and engineers working with fibre insulation materials in construction and industrial environments.
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Frequently Asked
According to the standard, fibre insulation boards are manufactured using natural fibrous materials such as wood and agricultural residues like bagasse (sugarcane fibre). These boards must have a density not exceeding 0.4 kg/cm³ and a minimum thickness of 9 mm. Thermal conductivity should be maintained at or below 0.65 mW/cm·°C to ensure effective insulation.
The standard specifies nominal board lengths ranging from 300 mm up to 3600 mm and widths from 300 mm to 1800 mm, with thickness options of 9, 12, 18, and 25 mm. Tolerances for length and width are ±3 mm for dimensions up to 120 cm and ±6 mm for larger sizes. Thickness tolerances vary between ±0.75 mm and ±1.25 mm depending on board thickness, with edge straightness and squareness controlled within 2 mm per 1000 mm.
Thermal conductivity testing involves preparing 30 cm by 30 cm specimens, tested using the guarded hot-plate method at a temperature difference between hot (30°C) and cold (25°C) plates. The thermal conductivity (K) is calculated using the heat flow rate, specimen thickness, surface area, and temperature difference. Boards must not exceed a thermal conductivity value of 5.6 kcal·cm/m²·h·°C (equivalent to 0.65 mW/cm·°C) to meet the standard's insulation requirements.
Flame-retardant fibre boards must demonstrate limited flame spread, with an average maximum charred area not exceeding 75 cm² during the surface spread of flame test. If treatment is applied on only one face, that face must be clearly marked. Water absorption limits vary by thickness and board type. The flame spread test follows a specific procedure where specimens are exposed to flame, and the char area is measured. Special sealers or primers may be needed before finishing to maintain flame resistance.
Sound absorption is tested using the standing wave method as per Appendix C of IS 3308, employing 30 cm by 30 cm specimens. The absorption coefficient is measured at frequencies ranging from 125 Hz to 2000 Hz, with minimum required values increasing from 0.1 to 0.5. Boards must meet these minimum coefficients to comply with the standard, ensuring effective acoustic insulation.
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