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IS 17260:2020 is the Indian Standard (BIS) for polycarbonate profiled sheets for roofing and cladding. 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.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
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.
Plastic roof and wall cladding materials - Part 3: Polycarbonate
Specifies requirements for profiled opaque and light-transmitting polycarbonate roof and wall cladding materials.
EN 1013-4:1998CEN (European Committee for Standardization), Europe
HighWithdrawn
Light transmitting profiled plastic sheeting for single skin roofing - Part 4: Specific requirements, test methods and performance of sheets of polycarbonate (PC)
Provided specific requirements for profiled polycarbonate sheets, a direct parallel to the IS code's scope.
ISO 11963:2012ISO (International Organization for Standardization), International
MediumCurrent
Plastics — Polycarbonate sheets — Types, dimensions and characteristics
Covers solid polycarbonate sheet material properties but is for flat sheets, not profiled sheets for roofing.
EN 16153:2013+A1:2015CEN (European Committee for Standardization), Europe
LowCurrent
Light transmitting flat multiwall polycarbonate (PC) sheets for internal and external use in roofs, walls and ceilings - Requirements and test methods
Covers multiwall PC sheets for roofing but specifies flat sheets, not the profiled geometry of IS 17260.
Key Differences
≠IS 17260 classifies sheets into Grade 1 (≥15 J) and Grade 2 (≥25 J) based on impact strength, whereas AS 4256.3 specifies a single minimum impact performance level (pass at 12 J).
≠The accelerated weathering test requirement in IS 17260 is for 3000 hours of Xenon arc exposure, while the comparable Australian standard, AS 4256.3, mandates a more stringent 5000 hours of exposure.
≠IS 17260 uses Vicat Softening Temperature (VST) with a minimum of 140 °C to assess thermal stability, whereas AS 4256.3 uses Deflection Temperature Under Load (DTUL) with a minimum of 128 °C, representing a different test methodology.
≠The Indian standard specifies a minimum tensile strength of 50 MPa, which is lower than the 55 MPa required by the Australian standard AS 4256.3.
Key Similarities
≈All standards (IS 17260, AS 4256.3, etc.) are fundamentally based on polycarbonate (PC) resin as the primary material for the sheets.
≈Both IS 17260 and its closest international equivalents like AS 4256.3 mandate the presence of a co-extruded UV-protective layer on the weather-facing side to ensure long-term durability.
≈Core performance characteristics such as impact resistance, light transmission, tensile properties, and dimensional stability are evaluated in both the Indian and key international standards, even if test methods or limits vary.
≈All standards for profiled sheets specify permissible tolerances on key dimensions like thickness, profile pitch, and profile depth to ensure product consistency and proper installation.
Parameter Comparison
Parameter
IS Value
International
Source
Thickness Tolerance
±10% of nominal thickness
±10% of nominal thickness
AS 4256.3-2006
Impact Resistance (Standard Grade)
≥ 15 J (for Grade 1)
No fracture or cracking at 12 J
AS 4256.3-2006
Light Transmission (Clear Solid Sheet)
≥ 80%
≥ 85% (for base material)
AS 4256.3-2006
Tensile Strength
≥ 50 MPa
≥ 55 MPa
AS 4256.3-2006
Weathering (Yellowness Index Change)
≤ 10 after 3000 h Xenon arc exposure
≤ 10 after 5000 h Xenon arc exposure
AS 4256.3-2006
Thermal Property
Vicat Softening Temperature (VST): ≥ 140 °C
Deflection Temperature Under Load (DTUL): ≥ 128 °C @ 1.82 MPa
AS 4256.3-2006
⚠ Verify details from original standards before use
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).