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IS 14732:1999 is the Indian Standard (BIS) for plastic water closet seats and covers. This standard specifies the requirements for materials, dimensions, construction, and performance of plastic water closet seats and covers. It ensures product quality, durability, and interchangeability for use with standard ceramic WC pans.
Specifies requirements for plastic water closet seats and covers, covering materials, dimensions, and performance.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! Ensure the selected seat type (A, B, C, or D) matches the specific shape and size of the WC pan (as per IS 2556) to ensure a proper fit.
! The ISI Mark on the product is a key indicator of its compliance with the mandatory quality and performance tests outlined in this standard.
! Thermosetting plastic seats offer higher rigidity and scratch resistance, whereas thermoplastic seats are more flexible and less likely to crack under impact.
Covers all trim, including seats, but is broader; seat requirements are a subsection of the standard.
BS 1254:1981BSI (United Kingdom)
HighWithdrawn
Specification for WC seats (plastics)
A historically equivalent standard focused specifically on plastic WC seats, now outdated.
AS 1373-1994Standards Australia (Australia)
HighWithdrawn
Plastics toilet seats
A historically direct equivalent standard for plastic toilet seats in the Australian market.
Key Differences
≠IS 14732 specifies a hinge life cycle test of 25,000 cycles, whereas IAPMO Z124.5 requires a more rigorous 50,000 cycles for standard duty seats.
≠The standard mounting hole center distance in IS 14732 is 155 ± 5 mm, which differs from the common North American standard of 5.5 inches (139.7 mm) specified in ASME A112.19.5.
≠The chemical resistance test in the IS code requires a 1-hour immersion. In contrast, IAPMO Z124.5 mandates a longer 16-hour exposure to a wider range of staining agents like lipstick and shoe polish.
≠IS 14732:1999 does not include specific test methods for modern features like soft-close hinges, which are now covered in updated international standards like ASME A112.19.5.
≠The IS standard includes a 'Slam Test' for the cover involving 1,000 cycles, while IAPMO Z124.5 specifies a more demanding 10,000 cycles for its equivalent test.
Key Similarities
≈Both IS 14732 and major international standards like IAPMO Z124.5 have a nearly identical static load requirement for the seat, specified as 1.33 kN (IS) and 300 lbf (IAPMO), ensuring similar load-bearing capacity.
≈All standards mandate that the finished product must have a smooth, non-absorbent, easily cleanable surface free from defects that could trap dirt or cause injury.
≈The general scope of the standards is consistent, aiming to establish minimum requirements for materials, construction, performance, and testing of plastic WC seats to ensure durability and sanitation.
≈Both the Indian and international standards cover the use of both thermosetting (e.g., Urea Formaldehyde) and thermoplastic (e.g., Polypropylene) plastics, focusing on performance outcomes rather than prescribing a single material type.
Parameter Comparison
Parameter
IS Value
International
Source
Static Load on Seat
1.33 kN (approx. 135 kgf)
300 lbf (approx. 1.33 kN)
IAPMO/ANSI Z124.5
Static Load on Cover
0.88 kN (approx. 90 kgf)
Not typically specified (considered a non-load bearing surface).
IAPMO/ANSI Z124.5
Hinge Life Cycle Test
25,000 cycles
50,000 cycles (Standard Duty)
IAPMO/ANSI Z124.5
Mounting Hole Spacing
155 ± 5 mm
5.5 in (139.7 mm)
ASME A112.19.5
Slam Test (Cover)
1,000 cycles from 45° angle
10,000 cycles
IAPMO/ANSI Z124.5
Chemical Resistance Test Duration
1 hour immersion
16 hours exposure
IAPMO/ANSI Z124.5
Boiling Water Test
Immerse in boiling water for 30 minutes
Immerse in water at 180 ± 5 °F (82 ± 3 °C) for 10 minutes
IAPMO/ANSI Z124.5
⚠ Verify details from original standards before use
Key Values5
Quick Reference Values
Minimum static load capacity on seat1.5 kN for 1 hour
Impact test requirement on seat2 kg steel ball dropped from 300 mm height
Hinge life cycle test30 000 cycles
Maximum water absorption for thermosetting plastics1.5 percent by mass
Resistance to cigarette burnNo ignition or progressive glow after 10 seconds contact
Tables & Referenced Sections
Key Tables
Table 1 - Dimensions of Water-Closet Seats and Covers
Table 2 - Performance Requirements for Water-Closet Seats and Covers
What is the minimum load a WC seat should be able to carry?+
The seat must withstand a static load of 1.5 kN (approx. 153 kg) for one hour without any failure (Clause 7.4).
How is the durability of the hinge tested?+
The hinge assembly is tested for 30,000 opening and closing cycles without showing any signs of failure or excessive wear (Clause 7.6).
Does this standard specify resistance to household chemicals?+
Yes, the standard requires the plastic surface to show no permanent staining or deterioration when tested with specified chemicals like sodium hypochlorite and synthetic detergents (Clause 7.2).
Are there different sizes of WC seats specified in this code?+
Yes, the code specifies dimensions for four types of seats (Type A, B, C, D) in Table 1, which correspond to different types of WC pans.