What is the maximum permissible weight of a helmet according to this version?

1500g under the 1993 standard (this was later revised in the 2015 version).

Does IS 4151 cover testing for the helmet visor?

No, visors must independently conform to IS 9973.

What are the primary performance tests required for helmet certification?

Impact absorption, penetration resistance, rigidity, and retention system testing (conducted as per IS 9790).

IS 4151

: 1993

Specification for protective helmets for scooter and motorcycle riders

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This standard specifies the requirements regarding materials, construction, workmanship, and performance tests (such as impact absorption and penetration resistance) for protective helmets used by motorcycle and scooter riders.

Specification for protective helmets for scooter and motorcycle riders

Quick Reference Values

Maximum mass of helmet1500 g

Peripheral vision clearanceNot less than 105 degrees

Upward visual clearanceNot less than 7 degrees

Downward visual clearanceNot less than 45 degrees

Practical Notes

Compliance with IS 4151 is legally mandatory under the Motor Vehicles Act for manufacturing and selling two-wheeler helmets in India.

Visors attached to the helmet are not covered by this standard and must conform separately to IS 9973.

The 1993 version was superseded by the 2015 revision, which updated impact testing protocols and altered weight limits to improve rider comfort and safety.