Link points to Internet Archive / others. Not hosted by InfraLens. Details
IS 14245:1995 is the Indian Standard (BIS) for prepainted hot-dip metallic coated steel sheets/coils for roofing and cladding. This standard specifies the requirements for prepainted steel sheets and coils that have a hot-dip metallic coating, such as zinc or aluminium-zinc alloy. It covers the base metal, paint system, dimensions, tolerances, and performance criteria for materials intended for roofing, cladding, and similar applications.
Specifies requirements for pre-painted hot-dip metallic coated steel sheets/coils for roofing and cladding.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! Always specify and verify the Total Coated Thickness (TCT), not just the Base Metal Thickness (BMT), as TCT includes the metallic and paint coatings which contribute to durability.
! The type of paint system (e.g., RMP, SMP, PVDF) significantly impacts durability, UV resistance, and cost; select based on the project's environmental exposure and required lifespan.
! Request the Manufacturer's Test Certificate (MTC) to confirm compliance with all performance tests, especially salt spray and UV resistance for coastal or sunny locations.
Standard Specification for Steel Sheet, Metallic-Coated by the Hot-Dip Process and Prepainted by the Coil-Coating Process for Exterior Exposed Building Products
Specifies requirements for prepainted hot-dip metallic-coated steel sheets for exterior building use.
EN 10169:2022European Committee for Standardization (CEN), Europe
Covers technical requirements for continuously organic coated steel flat products for building and other applications.
AS/NZS 2728:2013Standards Australia/Standards New Zealand, Australia/New Zealand
HighCurrent
Prefinished/prepainted sheet metal products for interior/exterior building applications — Performance requirements
Defines performance requirements for prepainted metallic sheet products used in buildings, focusing on durability.
JIS G 3322:2019Japanese Industrial Standards (JIS), Japan
MediumCurrent
Prepainted hot-dip zinc-55% aluminum alloy-coated steel sheet and strip
Specifically covers prepainted hot-dip 55% Al-Zn alloy coated steel, a subset of IS 14245's scope.
Key Differences
≠IS 14245:1995 is prescriptive with limited grades, while modern standards like EN 10169 are performance-based, offering detailed categories for corrosion resistance (C1-C5) and UV resistance (RUV1-RUV4), allowing for better specification for specific environments.
≠The minimum specified zinc coating mass in IS 14245 is 120 g/m² (Z12), which is significantly lower than the common exterior recommendation of 275 g/m² (Z275) in European practice for durability.
≠International standards like ASTM A755 and EN 10169 are frequently updated to include new paint technologies, stricter environmental compliance (e.g., REACH, RoHS), and more sophisticated testing methods (e.g., cyclic corrosion testing), whereas IS 14245 has not been updated since 1995.
≠EN 10169 and AS/NZS 2728 place a strong emphasis on accelerated weathering tests (QUV) and natural exposure results to classify the durability of the paint system, a level of detail not present in IS 14245.
Key Similarities
≈All standards cover the same fundamental product: a steel substrate with a hot-dip metallic coating (Zinc or Al-Zn) that is subsequently prepainted in a continuous coil-coating line.
≈The primary end-use application targeted by all standards is roofing, cladding, and other exterior building components.
≈Core paint quality and adhesion tests are conceptually similar across all standards, including T-bend tests for flexibility/adhesion, pencil hardness tests, and solvent rub tests (MEK rub).
≈The common types of paint systems specified, such as Regular Modified Polyester (RMP/PE), Silicon Modified Polyester (SMP), and Polyvinylidene Fluoride (PVDF), are recognized across all compared standards, forming a common technical basis.
Parameter Comparison
Parameter
IS Value
International
Source
Minimum Metallic Coating (55% Al-Zn)
150 g/m² total (AZ150)
AZ150 is a common grade, but a range (e.g., AZ100 to AZ200) is available depending on required durability.
ASTM A755/A755M-23
Minimum Metallic Coating (Zinc)
120 g/m² total (Z12)
Z275 (275 g/m²) is a common minimum for exterior building applications in moderate environments.
EN 10169:2022 (via EN 10346)
Paint Adhesion (T-Bend Test)
3T to 6T (No cracking of paint film)
Generally requires better performance, e.g., ≤ 2T for many systems, with no pick-off of coating.
AS/NZS 2728:2013
Top Coat Dry Film Thickness (DFT)
18-22 microns (RMP/SMP)
Typically 20-25 microns nominal, but specified as a range for a given performance category.
EN 10169:2022
Pencil Hardness
H minimum
F or H minimum, depending on the paint system and gloss level.
What is the standard zinc coating mass for these sheets?+
The standard refers to IS 277 for coating classes. A common class is Z120, which means a minimum of 120 g/m² total on both surfaces.
What does the T-bend test indicate?+
It measures the flexibility and adhesion of the paint film when the sheet is bent. A lower 'T' value (e.g., 2T) indicates better flexibility and less risk of cracking than a higher value (e.g., 4T).
What is the pencil hardness test for?+
It assesses the scratch resistance and hardness of the cured paint film. The standard requires a minimum hardness of 'H' (Clause 7.2).
Does this standard specify the color of the sheet?+
No, the color is as agreed upon between the purchaser and the manufacturer (Clause 5.1). The standard focuses on the performance and durability of the paint, not its specific color.