Similar International Standards
BS 3457:1973British Standards Institution (BSI), UK
HighWithdrawn
Specification for dimensions of fibre washers for water fittings
Specifies dimensions and basic material requirements for fibre washers intended for use in water fittings.
BS 1770:1976British Standards Institution (BSI), UK
HighWithdrawn
Specification for rubber joint rings for water mains and water service pipes
Covers material, physical characteristics, and dimensions for rubber joint rings/washers used in water mains and service pipes.
BS EN 681-1:1996British Standards Institution (BSI), UK (adopting EN)
MediumCurrent
Elastomeric seals. Material requirements for pipe joint seals used in water and drainage applications. Part 1: Vulcanized rubber
Specifies material requirements for vulcanized rubber seals, including washers, for cold and hot water supply systems, drainage, and sewerage.
ISO 4633:2002International Organization for Standardization (ISO), International
MediumCurrent
Rubber seals - Joint rings for water supply, drainage and sewerage pipelines - Specification for materials
Provides material specifications for rubber joint rings used in water supply, drainage, and sewerage systems, comparable to BS EN 681-1.
Key Differences
≠Potable Water Suitability: IS 4346:1982, an older standard, has less stringent or specific requirements for testing the suitability of materials in contact with potable water regarding their effect on water quality. Modern international standards like BS EN 681-1 (which often references BS 6920) include detailed chemical and microbiological testing to ensure no adverse effects on human consumption.
≠Elastomeric Material Classification: Modern international standards (e.g., BS EN 681-1) use a more comprehensive classification system for elastomeric materials (e.g., Type WA, WB, WC, WD based on application and temperature) with specific property ranges, whereas IS 4346:1982 provides more general requirements for 'vulcanized rubber'.
≠Compression Set Requirements: The maximum permissible compression set values and the specified test conditions (temperature, duration) can differ, with modern standards often demanding lower compression set for better long-term sealing performance.
≠Fibre Washer Specifications: While IS 4346 covers both rubber and fibre washers, specific international standards might separately detail fibre washer dimensions (like the withdrawn BS 3457) or focus on elastomeric materials, leading to different material property tests or dimensional tolerances for fibre components.
≠Test Methods and Reporting: International standards often refer to a broader range of harmonized test methods (e.g., ISO or EN standards for physical properties) and might require more detailed test reporting and certification compared to older national standards.
Key Similarities
≈Primary Purpose: Both IS 4346:1982 and its international equivalents share the fundamental objective of specifying requirements for washers to ensure effective sealing in water service applications, preventing leaks.
≈Material Types: They generally cover similar basic material categories, primarily vulcanized rubber and fibre-based materials, as suitable for sealing applications in water systems.
≈Basic Dimensional Parameters: All standards define essential dimensional characteristics such as inner diameter, outer diameter, and thickness for washers, critical for interchangeability and proper fitting.
≈Mechanical Property Tests: Common mechanical properties like hardness, tensile strength, and elongation at break are specified for elastomeric materials to ensure their physical integrity and performance.
≈Performance Requirements: The underlying expectation for the washers to withstand operational pressures and temperatures without failure or significant degradation over time is a shared performance criterion.