This document outlines the detailed specifications for vitreous china wash basins used in sanitary fittings throughout India. It defines the acceptable patterns, dimensions, construction guidelines, fixing methods, and testing procedures to ensure quality, compatibility, and durability of wash basins in various environments including residential, commercial, and healthcare facilities.
Overview
This document outlines the detailed specifications for vitreous china wash basins used in sanitary fittings throughout India. It defines the acceptable patterns, dimensions, construction guidelines, fixing methods, and testing procedures to ensure quality, compatibility, and durability of wash basins in various environments including residential, commercial, and healthcare facilities.
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Frequently Asked
The standard defines two primary patterns: flat back and angle back. Flat back basins come in sizes such as 660 x 460 mm (surgeon's basin), 630 x 450 mm, 550 x 400 mm, and 450 x 300 mm. Angle back basins include sizes like 600 x 480 mm and 400 x 400 mm (surgeon's basin). Basins sized 450 x 300 mm (flat back) and 400 x 400 mm (angle back) must have at least two screw-fixing holes with a minimum diameter of 6.5 mm. Alternate patterns or sizes can be produced only if mutually agreed upon, but all other standard requirements remain applicable.
For basins with multiple tap holes, outer tap holes must have diameters of 30 +2/-0 mm, central tap holes 35 +2/-1 mm, with distances between outer holes at 480 mm for 630x450 basins and 400 mm for 550x400 basins. The horizontal distance from tap holes to waste outlet must not exceed 170 mm, and wall thickness near tap holes is limited to a maximum of 18 mm. Waste outlet openings require a diameter of 46 +2/-3 mm, bevelled portion diameter up to 75 mm max, and seating face diameter at least 60 mm. The outlet depth for integral overflow ranges from 45 to 50 mm, with a maximum vertical distance of 250 mm from the tap platform to the waste hole.
Wash basins should be manufactured as one-piece vitreous china units with smooth internal corners for hygiene. Flat back basins up to 450 x 300 mm and angle back basins up to 400 x 400 mm require a minimum of two screw-fixing holes, each at least 6.5 mm in diameter. Pedestal basins must have proper provisions for securing the pedestal to the floor to ensure stability, as illustrated in the standard. Although earlier references to cast iron brackets (IS 775) have been withdrawn, the fixing approach must ensure firm and stable installation while facilitating easy cleaning.
Wash basins must undergo overflow testing where water is supplied at 9.5 ± 0.5 liters per minute with the waste outlet closed; the basin should drain continuously for at least 5 minutes without overflowing. Load bearing tests require the basin to sustain a uniformly distributed load of approximately 110 ± 8 kg applied over a 100 mm x 100 mm area for one hour without any cracks, deformation, or failure. Additionally, the interior surface finish must be smooth and uniformly glazed to ensure proper drainage and hygiene.
Yes, surgical or healthcare wash basins must not include soap holder recesses or combined overflow features to maintain high hygiene standards. These basins are designed with one-piece construction and smooth internal angles for ease of cleaning. Tap holes should be symmetrically placed and compatible with pillar taps conforming to IS 1795 or IS 8931. The tap platform is positioned above the spillover level to prevent contamination. Screw-fixing holes are mandatory for secure installation as per the standard.
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