What is the difference between IS 771 Part 1 and Part 2?

Part 1 covers the overarching material properties, general requirements, and testing methods for all glazed fire-clay sanitaryware. Part 2 is strictly dedicated to the dimensions, tolerances, and specific shapes of kitchen and laboratory sinks.

Why are laboratory sinks typically specified as fire-clay?

Glazed fire-clay is thicker and heavier than standard vitreous china, making it highly resistant to physical impact, thermal shock (from hot liquids), and corrosive laboratory chemicals.

What is the expected dimensional tolerance for these sinks?

A tolerance of ±4% is generally allowed on the specified dimensions due to the inherent manufacturing process of fire-clay.

IS 771

: 2000

Glazed Fire-Clay Sanitary Appliances: Part-2 Specific Requirements of Kitchen And Laboratory Sinks

CurrentSpecializedSpecificationBIMMEP · Sanitary Appliances and Water Fittings

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This standard lays out the specific requirements, dimensions, and manufacturing tolerances for glazed fire-clay kitchen and laboratory sinks. MEP engineers and architects use it to ensure proper sizing, coordination with plumbing fittings, and durable performance in residential, commercial, and institutional laboratory settings.

Glazed Fire-Clay Sanitary Appliances: Part-2 Specific Requirements of Kitchen And Laboratory Sinks

Quick Reference Values

Dimensional tolerance (general)± 4%

Waste hole diameter (kitchen sink)65 mm

Waste hole diameter (laboratory sink)65 mm

Typical standard length (kitchen sink)600 mm or 750 mm

Practical Notes

This code must be used in conjunction with IS 771 (Part 1), which details the general requirements, material properties, and performance tests (like crazing and chemical resistance).

Because fire-clay shrinks significantly during kiln firing, these sinks have a larger dimensional tolerance (usually ±4%) than standard vitreous china. Millwork, countertops, and casework should be templated from the actual sink delivered to the site rather than relying strictly on nominal catalog dimensions.