IS 7231:1994 is the Indian Standard (BIS) for plastic flushing cisterns for water closets and urinals. This standard specifies the requirements for materials, construction, dimensions, and performance of plastic flushing cisterns, including single and dual-flush models, for use with water closets and urinals. It outlines tests for flushing effectiveness, leakage, and mechanical endurance to ensure product quality and water conservation.
plastic flushing cisterns for water closets and urinals
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Endurance (Outlet/Flush Mechanism) | 200,000 cycles | 200,000 cycles | BS EN 14055:2010+A1:2015 |
| Endurance (Inlet/Fill Valve) | 250,000 cycles | 50,000 cycles | AS 1172.2:2014 |
| Full Flush Volume | Specified capacities from 5 to 12.5 litres (e.g., 10 L ± 0.5 L) | Class 1: 6 L (+0.5 L, -0.2 L), Class 2: 4 L (± 0.2 L) | BS EN 14055:2010+A1:2015 |
| Dual Flush Requirement | Not specified; standard based on single flush volumes. | Integral part of the standard, with specific volume requirements for full and reduced flush (e.g., 4.5/3 L). | AS 1172.2:2014 |
| Acoustic (Noise) Test | Not specified | Required; classification into Acoustic Groups based on noise level, e.g., Group I (<20 dB(A)). | BS EN 14055:2010+A1:2015 |
| Flushing Performance Media | 100 polypropylene balls (12 mm dia) | Varies; flush test for the full WC suite can include 50 polypropylene balls (20 mm dia), 12 sheets of polyethylene, paper tests, etc. | BS EN 14055:2010+A1:2015 |
| Backflow Prevention | Overflow pipe must discharge outside, inlet valve to have anti-siphonage device. | Specified air gap types (e.g., Type AG, Type AB) with precise minimum dimensions. | BS EN 14055:2010+A1:2015 |