What is the minimum required light transmission for a clear polycarbonate sheet under this IS code?

For clear transparent sheets, the light transmission must be greater than 80% (Table 2).

How is the impact resistance of the sheets classified?

The sheets are classified for non-fragility as Class A, B, or C based on a drop weight impact test after UV ageing, with Class A having the highest performance (Table 3 and Annex C).

Does this standard apply to multiwall polycarbonate sheets?

No, this standard is specifically for single-skin profiled sheets. Multiwall sheets are covered by IS 16275.

What is the minimum required Vicat softening temperature?

The Vicat softening temperature must be at least 145°C, ensuring stability at elevated temperatures (Table 2).

IS 17260

: 2020

Polycarbonate profiled sheets for roofing and cladding

CurrentFrequently UsedSpecificationBIMArchitectural · Roofing Materials

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This standard specifies the requirements for single-skin profiled polycarbonate sheets intended for roofing, cladding, and daylighting applications. It covers the material composition, dimensions, physical and mechanical properties like impact strength and load resistance, optical properties like light transmission, and durability aspects including weather and UV resistance.

Specifies requirements for polycarbonate profiled sheets used for roofing and cladding.

Quick Reference Values

Minimum Light Transmission (Clear Sheet)> 80 %

Minimum Vicat Softening Temperature≥ 145 °C

Minimum Izod Impact Strength (Un-notched)≥ 600 J/m

Nominal Thickness Range0.8 mm to 3.0 mm

Maximum Haze (Clear Sheet)< 1.5 %

Water Absorption (24h at 23°C)< 0.2 %

Practical Notes

It is critical to install sheets with the designated UV-protective side facing outwards. The standard mandates that this side be clearly marked.

Polycarbonate has a high coefficient of thermal expansion (~0.065 mm/m/°C). Fastener holes must be oversized to accommodate thermal movement and prevent sheet buckling or cracking.

Avoid contact with incompatible chemicals, such as solvents, alkalis, and abrasive cleaners, which can cause surface crazing or damage the protective UV layer.