How are polyurethane sealants classified under IS 17466?

They are classified by their Movement Accommodation Factor (MAF), for example, Class 25 for ±25% movement and Class 12.5 for ±12.5% movement (Table 1).

What is the typical Shore A hardness requirement for a cured PU sealant?

The hardness should be between 15 and 50 when tested as per the specified method (Table 3).

What does 'non-sag' mean for a sealant?

It means the sealant will not slump or flow more than 3 mm when applied in a vertical joint (Clause 5.4 and Table 2).

Is durability testing required by this standard?

Yes, the standard requires testing for adhesion and cohesion properties after exposure to heat, water, and UV radiation to simulate weathering and aging (Clause 6.3).

IS 17466

: 2020

Polyurethane based sealants for construction - Specification

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This standard specifies the requirements, classification, and test methods for single and multi-component polyurethane-based sealants used for sealing joints in building construction. It ensures the material's performance in terms of movement capability, adhesion, cohesion, and durability against environmental factors.

Specifies requirements for polyurethane based sealants used in building and civil engineering construction.

Quick Reference Values

Movement Accommodation Factor (Class 25)±25%

Movement Accommodation Factor (Class 12.5)±12.5%

Hardness (Shore A)15 to 50

Tack-Free Time (Max)24 h

Flow / Slump for Non-Sag Type (Max)3 mm

Adhesion/Cohesion Elongation after Water Immersion (Min)100%

Practical Notes

Proper joint preparation, including cleaning and priming as per manufacturer's instructions, is critical for achieving the specified adhesion and performance.

Always check the product's shelf-life and storage conditions before use, as expired or improperly stored sealant may fail to cure correctly.

For two-component systems, ensure the base and curing agent are mixed in the exact ratio specified to achieve the desired properties; incomplete mixing can lead to soft spots or failure.