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IS 2745:1983 is the Indian Standard (BIS) for non-metal helmets for firemen and civil defense personnel. This standard prescribes the requirements for materials, construction, workmanship, and performance testing of non-metal helmets intended for firemen and civil defense personnel. It strictly outlines physical tests ensuring protection against impact, penetration, electrical shock, and fire exposure.
Specification for Non-Metal Helmets for Firemen and Civil Defense Personnel
! Always check that the internal harness/suspension system is intact; the helmet's shock absorption capability relies entirely on the clearance between the shell and the wearer's head.
! Do not paint or apply unapproved solvents to the helmet shell, as this can degrade the fiberglass or polycarbonate material and fail flammability or impact tests.
! Neck protectors and visors must be compatible and meet their own respective thermal and optical requirements if attached.
EN 443:2008CEN (European Committee for Standardization), Europe
MediumCurrent
Helmets for fire-fighting in buildings and other structures
Specifies requirements for helmets used in structural firefighting, aligning with the core purpose of IS 2745.
NFPA 1971, 2018 EditionNFPA (National Fire Protection Association), USA
MediumCurrent
Standard on Protective Ensembles for Structural Fire Fighting and Proximity Fire Fighting
Covers the helmet as part of a complete protective ensemble for structural firefighting activities.
AS/NZS 4067:2012Standards Australia / Standards New Zealand, Australia/New Zealand
MediumCurrent
Helmets for structural firefighting
Sets performance criteria for helmets intended for use in structural firefighting activities, similar to EN 443.
Key Differences
≠Modern international standards like EN 443 mandate extensive testing for radiant heat (e.g., 14 kW/m²) and direct flame engulfment (e.g., 1000°C furnace), which are far more severe than the basic Bunsen burner flammability test in IS 2745:1983.
≠EN 443 and NFPA 1971 require integrated, high-performance face shields and/or eye guards that meet specific impact, thermal, and optical criteria. IS 2745 does not mandate integrated eye protection as part of the helmet certification.
≠International standards require impact absorption testing to be performed under various environmental conditions, including high heat, extreme cold (e.g., -30°C), and after chemical exposure. IS 2745 testing is conducted only at ambient conditions.
≠EN 443 and NFPA 1971 include specific requirements and test methods for lateral (side) impact protection, reflecting modern understanding of firefighting hazards. IS 2745 primarily focuses on crown (top) impact protection.
Key Similarities
≈All standards share the fundamental objective of protecting the firefighter's head from impact, penetration by sharp objects, and heat during emergency operations.
≈All standards mandate a core set of mechanical tests, including shock/impact absorption, penetration resistance, and flame resistance, forming the basis of helmet safety.
≈A secure retention system, including a chin strap and internal harness, is a mandatory requirement across all standards to ensure the helmet remains on the user's head during strenuous activity.
≈All standards specify a degree of electrical insulation to protect the wearer from accidental contact with low-voltage electrical sources, although the test methods and voltages vary.
Parameter Comparison
Parameter
IS Value
International
Source
Impact Absorption (Max Transmitted Force)
Shall not exceed 4900 N for a 5 kg mass dropped from 1.5 m (approx. 74 J).
Shall not exceed 5 kN for a 5 kg striker dropped from 2.5 m (approx. 125 J).
EN 443:2008
Penetration Resistance
0.5 kg pointed striker dropped from 2 m shall not contact the headform.
3 kg pointed striker dropped from 1 m shall not contact the headform.
NFPA 1971, 2018 Edition
Flame Resistance Test
Application of a Bunsen burner flame for 10 seconds; afterflame shall not exceed 5 seconds.
Exposure to a furnace at approx. 1000°C for 10 seconds; no flame penetration and afterflame must be ≤ 2 seconds.
EN 443:2008
Radiant Heat Resistance
Not explicitly specified as a distinct performance requirement.
Exposure to 14 kW/m² radiant heat flux; internal temperature rise and deformation are strictly limited.
EN 443:2008
Electrical Insulation (Leakage Current)
Leakage current not to exceed 3.0 mA at 900 V AC.
Leakage current not to exceed 1.2 mA at 2200 V AC (for Class E rating).
EN 443:2008
Lateral Impact Protection
Not specified.
Mandatory test with specific impact energy and force transmission limits for front, side, and rear impacts.
EN 443:2008
Chin Strap Strength
Must withstand a static load of 490 N for 1 minute without breaking or stretching >25 mm.
System must not release below 150 N but must release between 500 N and 1000 N to prevent strangulation.
EN 443:2008
⚠ Verify details from original standards before use
Key Values7
Quick Reference Values
maximum mass of helmet800 g (excluding visor and neck protector)
shock absorption max transmitted force14.7 kN (1500 kgf)
penetration test drop height1.0 m
penetration striker mass3.0 kg
electrical resistance test voltage2000 V AC for 1 minute
What is the maximum allowed weight for a fireman's helmet under this code?+
The mass of the helmet must not exceed 800 g, excluding the visor and neck protector.
Does the helmet protect against electrical hazards?+
Yes, it must pass an electrical resistance test at 2000 V AC for 1 minute with a leakage current not exceeding 3 mA.
What materials are acceptable for the helmet shell?+
The standard specifies non-metallic materials like fiberglass reinforced plastic (FRP) or high-density engineering plastics (like polycarbonate) that can pass the required thermal and impact tests.
How is the penetration resistance tested?+
By dropping a 3 kg pointed striker from a height of 1 meter directly onto the helmet shell mounted on a headform.