What are the standard sizes of head forms specified in IS 7692?

Five sizes are specified: A (500mm), E (540mm), J (585mm), K (600mm), and M (620mm) circumference (Table 1).

What is the specified mass for the common 'J' size head form?

The mass for head form size J is 5.6 ± 0.05 kg (Table 1).

What materials are permitted for constructing the head forms?

The standard specifies materials with low resonance such as mahogany wood (density ≥ 0.48 g/cm³) or a specified magnesium alloy (Clause 2).

IS 7692

: 1993

Specification for head forms for testing of helmets

CurrentSpecializedSpecificationFire Safety · Fire Fighting

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This standard specifies the materials, dimensions, mass, and constructional requirements for various sizes of head forms. These head forms are used for the testing of protective helmets to ensure they meet safety standards and provide a consistent basis for evaluation.

Specification for head forms for testing of helmets

Quick Reference Values

Mass of Headform Size A3.6 ± 0.05 kg

Mass of Headform Size J5.6 ± 0.05 kg

Mass of Headform Size M6.1 ± 0.05 kg

Circumference of Headform Size A500 mm

Circumference of Headform Size J585 mm

Circumference of Headform Size M620 mm

Minimum density for wood headform0.48 g/cm³

Practical Notes

This standard is critical for any lab testing protective helmets (industrial, firefighter, etc.) to ensure the test setup is standardized.

Ensuring the head form's mass is within the specified tolerance (e.g., ±0.05 kg) is critical for valid impact and shock absorption test results.

The standard is harmonized with international standard ISO/DIS 6220, making it relevant for products intended for international markets.