What material is specified for these floats?

Low-density polyethylene (LDPE) that conforms to the requirements of IS 7328 (Clause 3.1).

What are the standard sizes for spherical floats under this IS code?

The standard specifies three nominal diameters: 100 mm, 125 mm, and 150 mm (Table 1).

How is the leakage test performed?

The float is subjected to an internal air pressure of 15 kPa for 2 minutes while submerged in water. There should be no signs of air leakage (Clause 6.3).

What information must be marked on the float?

The float should be marked with the manufacturer's name or trade-mark and its nominal size (Clause 8.1).

IS 9762

: 1994

polyethene floats (spherical) for float valves

CurrentSpecializedSpecificationMEP · Sanitary Appliances and Water Fittings

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This standard specifies the requirements for materials, dimensions, construction, and performance of spherical polyethene floats. These floats are intended for use with float-operated valves (ballcocks) in water closets and water supply storage cisterns.

polyethene floats (spherical) for float valves

Quick Reference Values

Material specifiedLow-density polyethylene (LDPE) conforming to IS 7328

Nominal diameters specified100 mm, 125 mm, and 150 mm

Minimum wall thickness1.0 mm

Leakage test internal air pressure15 kPa for 2 minutes

Buoyancy test duration24 hours submerged in water

Thread for connectionAs per IS 554

Practical Notes

Ensure the float is made from virgin polyethene, as recycled material may have impurities affecting buoyancy and life.

The welded seam is a common point of failure; inspect for uniform and complete fusion to prevent water ingress over time.

Check compatibility of the connection thread with the float valve lever arm, as thread mismatch can lead to insecure fitting.