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IS 772:1985 is the Indian Standard (BIS) for vitreous sanitary appliances (vitreous china) - general requirements. This standard specifies the general requirements for material, manufacture, glazing, dimensions, and testing of vitreous china sanitary appliances. It is primarily used by plumbing engineers, architects, and quality inspectors to ensure sanitary fittings are durable, hygienic, and resistant to crazing and water absorption.
Lays down general requirements, dimensions, and testing methods for vitreous china sanitary appliances.
Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.
vitreous chinaceramicglaze
International Equivalents
Similar International Standards
ASME A112.19.2-2018/CSA B45.1-18American Society of Mechanical Engineers (ASME), USA / Canadian Standards Association (CSA), Canada
HighCurrent
Plumbing Fixtures
Covers material, dimensional, and performance requirements for various plumbing fixtures, including vitreous china.
BS EN 997:2018+A1:2022British Standards Institution (BSI), UK / European Committee for Standardization (CEN), Europe
MediumCurrent
WC pans and WC suites with integral trap
Product-specific standard incorporating general vitreous china requirements (e.g., water absorption, crazing) for WCs.
AS 1976-1990Standards Australia (AS), Australia
HighWithdrawn
Vitreous china sanitary plumbing fixtures
Provided general quality requirements for all vitreous china fixtures, similar in structure and intent to IS 772.
BS 3402:1969British Standards Institution (BSI), UK
HighWithdrawn
Specification for quality of vitreous china sanitary appliances
A direct historical equivalent, specifying material and quality requirements for vitreous china appliances in general.
Key Differences
≠IS 772 lacks requirements for mechanical strength and load resistance for fixtures like wall-hung WCs and wash basins, which are mandatory in modern standards like BS EN 997 (400 kg load test for WCs) and BS EN 14688.
≠The chemical resistance test in IS 772 is limited to basic acid and alkali. ASME A112.19.2 specifies a much wider range of staining and chemical agents, including cleaning agents, ink, and iodine, reflecting modern usage.
≠IS 772 specifies generic, percentage-based dimensional tolerances (e.g., ±3% for dimensions >100mm), whereas modern EN and ASME standards define tighter, absolute tolerances for critical functional and interfacing dimensions (e.g., fixing hole positions, outlet diameters).
≠The crazing resistance test in IS 772 specifies a higher autoclave pressure (0.7 MN/m²) compared to the requirement in some current European standards like BS EN 997 (≥0.5 MN/m²), indicating a potentially more severe test.
Key Similarities
≈The fundamental definition of vitreous china, based on a maximum water absorption of 0.5% by mass, is consistent across IS 772, ASME A112.19.2, and BS EN 997.
≈All standards mandate that all exposed surfaces of the appliance shall be covered with an impervious, smooth, and readily cleanable glaze.
≈The use of an autoclave test as the standard method for determining resistance to crazing of the glaze is a common requirement across IS 772 and its international counterparts.
≈All standards include clauses for visual inspection to control and limit the extent of manufacturing blemishes such as spots, blisters, crazing, and waviness on significant surfaces.
Parameter Comparison
Parameter
IS Value
International
Source
Water Absorption (by mass)
≤ 0.5%
≤ 0.5%
ASME A112.19.2-2018
Minimum Wall Thickness
6.0 mm
6.4 mm (1/4 inch)
ASME A112.19.2-2018
Crazing Test (Autoclave Pressure)
0.7 MN/m² (approx. 7 bar)
≥ 0.5 MN/m² (5 bar)
BS EN 997:2018
Chemical Resistance Test (Acid)
3% Hydrochloric Acid
Stain test with 10% Citric Acid
ASME A112.19.2-2018
Static Load Test (Wall-Hung WC)
Not Specified
4.0 kN (approx. 400 kg)
BS EN 997:2018
Warpage (of a side)
≤ 1.5% of the length of the side
≤ 3 mm for lengths up to 500 mm (i.e., 0.6% for a 500mm side)
BS EN 14688:2015 (for Wash Basins)
Dimensional Tolerance (General)
±3% on dimensions > 100mm
Defined by specific functional dimension (e.g., Fixing Holes Pitch: ±2mm)
BS EN 997:2018
⚠ Verify details from original standards before use