IS 4151:2015 addresses helmets for riders of two-wheeler motor vehicles. This standard outlines the materials, workmanship, finish, construction, and performance criteria for protective helmets, whether with or without lower face cover, utilized by daily two-wheeler riders. Notably, these helmets are not designed for high-speed competitive events.

The standard outlines helmets available in sizes ranging from 500 mm to 620 mm, tailored to match various head forms.

The standard defines requirements for the helmet shell, protective padding, comfort padding, retention system, metal components, visor material, and construction. The helmet's weight must not surpass 1500 g. Additionally, the standard outlines specifications for dimensions, peripheral vision, workmanship, impact absorption, rigidity, retention system, and finish.

A helmet stands as a critical piece of personal protective gear for motorcycle riders, shielding them from the dangers of road travel. This standard is crafted to encompass guidelines for protective helmets utilized by motorcycle riders in their daily journeys.

The fundamental structure of the helmet should consist of a sturdy outer shell complemented by mechanisms to absorb impact energy, along with a retention system. Optional features like earflaps and a neck curtain can also be incorporated into the protective helmet. The primary function of the helmet is to safeguard the wearer's head against impacts.

TESTS

The subsequent test must be conducted for helmet's performance.

• Impact Absorption Test

• Resistance to penetration Test

• Rigidity Test

• Dynamic Test of Retention System

• Audibility Test

• Retention Test of Helmet

• Opening Angle Test

• Flexibility of Peak

Each helmet must be clearly and indelibly marked with the manufacturer's name or trademark, size, year of manufacture, and helmet mass. A standard mark (ISI Mark) may also be applied to the helmet. The Manufacturer must obtain a BIS license from the Bureau of Indian Standards to use a standard mark (ISI Mark). The BIS grants a license based on a successful assessment of manufacturing infrastructure, quality control and testing capabilities, and production process during a visit to manufacturing premises.

PROCESS FOR BIS ISI MARK CERTIFICATION