IS 12118:1992 Part 2 is the Indian Standard (BIS) for polysulphide based sealants - specification. This standard specifies the requirements for two-part polysulphide based sealants used for sealing joints in buildings and other structures. It classifies sealants into Type 1 (Pouring grade) for horizontal joints and Type 2 (Gun grade) for vertical or overhead joints, and defines their material, physical, and performance characteristics.
Specifies requirements for polysulphide based sealants used in building construction.
Overview
- Status
- Current
- Usage level
- Specialized
- Domain
- Materials Science — Waterproofing and Damp Proofing
- Type
- Specification
- Amendments
- Amendment 1 (October 1993); Amendment 2 (July 1998); Amendment 3 (January 2005)
Also on InfraLens for IS 12118
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! Proper joint preparation, including cleaning and priming as per manufacturer's guidelines, is critical for achieving the specified adhesion performance.
! The pot life (application life) is highly sensitive to ambient temperature and humidity; mix only the amount of material that can be used within this period.
! Ensure the correct grade (Pouring vs. Gun) is used for the joint orientation to prevent sagging in vertical joints or to ensure proper levelling in horizontal ones.
Frequently referenced clauses
Updates & Amendments3 amendments
Amendment 1 (October 1993)
Amendment 2 (July 1998)
Amendment 3 (January 2005)
Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.
polysulphide sealantsealantjoint fillerelastomeric sealantwaterproofing
International Equivalents
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International Comparison — Coming Soon
We're adding equivalent international standards for this code.
Key Values7
Quick Reference Values
Classification Type 1Pouring Grade (self-levelling)
Classification Type 2Gun Grade (non-sag)
Minimum Application Life at 27°C2 hours
Maximum Slump/Flow for Gun Grade (Type 2)2 mm
Cured Hardness (Shore A)15 to 50
Minimum Adhesion in Peel0.9 N/mm
Maximum Weight Loss after Heat Ageing10 %
Tables & Referenced Sections
Key Tables
Table 1 - Physical Requirements of the Mixed Sealant
Table 2 - Performance Requirements of the Cured Sealant
Key Clauses
Clause 3 - Classification
Clause 4 - Material Requirements
Clause 5 - Physical Requirements of Mixed Sealant
Clause 6 - Performance Requirements of Cured Sealant
Clause 8 - Packing and Marking
Appendix A - Method for Determination of Slump
Frequently Asked Questions4
What are the two main types of polysulphide sealants specified in this code?+
Type 1 (Pouring grade) for horizontal joints and Type 2 (Gun grade) for non-sag applications in vertical or overhead joints (Clause 3).
What is the minimum application life (pot life) at 27°C?+
A minimum of 2 hours for both Type 1 and Type 2 sealants (Table 1).
What is the required Shore A hardness for the cured sealant?+
The hardness must be between 15 and 50 after 14 days of curing (Table 2).
Is a primer always required when using these sealants?+
Yes, a compatible primer is required to be applied to joint surfaces before sealant application to ensure proper adhesion (Clause 4.3).
QA/QC Inspection Templates
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QA/QC templates coming soon for this code.