Link points to Internet Archive / others. Not hosted by InfraLens. Details
IS 771:2000 (Part 7) is the Indian Standard (BIS) for glazed fire-clay sanitary appliances, part 7: specific requirements of slop sinks. This standard specifies the manufacturing requirements, dimensions, and tolerances for glazed fire-clay slop sinks. It is utilized by MEP and public health engineers when specifying sanitary fixtures for clinical disposal, hospitals, janitor rooms, and laboratories.
Glazed Fire-Clay Sanitary Appliances, Part 7: Specific Requirements of Slop Sinks
Covers material and performance requirements for all ceramic fixtures, including fire-clay.
BS EN 997:2018+A1:2022BSI / CEN (UK / Europe)
MediumCurrent
WC pans and WC suites with integral trap
Product-specific (WCs) but includes material requirements applicable to fire-clay.
BS EN 14688:2015BSI / CEN (UK / Europe)
MediumCurrent
Sanitary appliances. Wash basins. Functional requirements and test methods
Product-specific (wash basins) but includes material and surface quality requirements.
BS 3402:1969BSI (UK)
HighWithdrawn
Specification for quality of vitreous china sanitary appliances
Historical equivalent with a similar material-centric approach to quality.
Key Differences
≠IS 771 is a general standard for 'fire-clay' material, whereas modern international standards (EN, ASME) are typically product-specific (e.g., WC Pans, Wash Basins) and performance-based, covering various ceramic materials.
≠The definition of the ceramic body differs significantly. IS 771 allows water absorption up to 12% for fire-clay, while ASME A112.19.2 requires less than 0.5% for vitreous china, a category that often includes high-grade fire-clay products in the US market.
≠International standards like EN 997 include extensive functional performance testing (e.g., solid removal tests, flush volume, trap seal replenishment) which are not part of the general material requirements in IS 771 Part 1.
≠IS 771 prescriptively specifies a minimum glaze thickness (0.4 mm), while modern international standards focus on the performance of the glaze (imperviousness, resistance) rather than its thickness.
Key Similarities
≈Both IS 771 and international counterparts mandate a crazing resistance test, typically using an autoclave at similar pressures and durations to ensure long-term glaze durability.
≈All standards require the glazed surface to be resistant to staining and chemical attack from common household acids and alkalis, ensuring the product maintains its appearance over time.
≈Requirements for the quality of the glazed surface are similar, specifying a smooth, hard, impervious finish free from visual defects like blisters, pimples, and cracks.
≈All standards specify tolerances for warpage and key dimensions to ensure the interchangeability and correct installation of fixtures.
Parameter Comparison
Parameter
IS Value
International
Source
Water Absorption of Body
≤ 12.0% by mass
≤ 0.5% by mass (for Vitreous China)
ASME A112.19.2-2018
Crazing Resistance Test (Autoclave)
0.7 N/mm² (~7 bar) for 1 hour
100 psi (~6.9 bar) for 1 hour
ASME A112.19.2-2018
Minimum Glaze Thickness
≥ 0.4 mm
Not specified; performance-based (must be impervious)
ASME A112.19.2-2018
Warpage of Flat Surfaces
Shall not exceed 6 mm
Shall not exceed 6 mm per metre of length
ASME A112.19.2-2018
Chemical Resistance
No visible stain after testing with acid and alkali solutions
No visible change after testing with a range of chemicals
BS EN 14688:2015
Test for Ink Stain
Stain from Methylene Blue dye must be removable by water after 5 minutes
Stain shall be removable with water, or if necessary, denatured alcohol
ASME A112.19.2-2018
⚠ Verify details from original standards before use
Key Values2
Quick Reference Values
General dimensional tolerance±4 percent
Minimum thickness of fire-clay body12 mm
Tables & Referenced Sections
Key Tables
Table 1 - Dimensions of Slop Sinks
Key Clauses
Clause 4 - Manufacture and Finish
Clause 5 - Dimensions and Tolerances
Clause 6 - Marking
Frequently Asked Questions3
What is the primary application of a slop sink?+
It is a specialized deep sink designed for disposing of clinical liquid waste, washing bedpans, or janitorial use, predominantly in healthcare and institutional facilities.
Are material testing methods covered in this part?+
No, standard tests for water absorption, crazing, and chemical resistance of the glaze are covered under IS 771 (Part 1).
What is the allowable dimensional tolerance for these sinks?+
Generally, a tolerance of ±4 percent is permitted on the specified dimensions unless specifically mentioned otherwise in the standard.