Is IS 9973:1981 still an active standard?

No, it has been superseded and its provisions are now included in IS 4151.

What is the primary safety test for a visor under this specification?

An impact resistance test to ensure the visor does not shatter or fracture upon impact from a standardized object.

What are the main optical requirements for a visor?

The visor must have high luminous transmittance (e.g., >85%) and be free from optical distortion, haze, or other defects that could impair the rider's vision.

IS 9973

: 1981

Specification for visors for scooter helmets

CurrentSpecializedSpecificationTransportation · Fire Fighting

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This standard specifies the material, optical, mechanical, and constructional requirements for visors intended for use with scooter helmets. It aims to ensure rider safety by providing adequate visibility and protection against impact and weather.

Specification for visors for scooter helmets

Quick Reference Values

Minimum Luminous Transmittance85%

Impact Resistance TestShall not fracture when struck by a 500g steel ball dropped from a height of 2 metres.

Material RequirementShall be made of material which does not splinter on fracture.

Practical Notes

This standard is obsolete. Its requirements have been amalgamated into IS 4151 'Protective Helmets for Two Wheeler Riders - Specification'.

Always refer to the latest version of IS 4151 for current legal and safety requirements for both helmets and visors in India.

Key performance criteria for visors remain impact strength, scratch resistance, and optical clarity (high light transmittance and no distortion).