ISO 11999-3:2025

Overview

ISO 11999-3:2025 - "PPE for firefighters - Test methods and requirements for PPE used by firefighters who are at risk of exposure to high levels of heat and/or flame while fighting fires occurring in structures - Part 3: Clothing" sets minimum design and performance requirements for structural firefighting clothing. The standard defines test methods and mandatory/optional performance criteria for garments intended to protect against flame, high thermal loads and particulates produced during structural firefighting, while excluding specialist ensembles for reflective high‑risk exposures or long‑duration wildland operations.

Key topics and requirements

• Scope and exclusions: Focused on structural firefighting clothing; not intended for specialist reflective garments (see ISO 15538) or long-term wildland clothing (see ISO 15384 / ISO 16073-3). Limited chemical/biological protection only for short-term accidental exposure.
• Design and configuration: Requirements for garment construction, component assembly, closures, pockets, sizing, neck protection, inspection access, reinforcements, anti‑wicking barriers, protective wristlets, cowls, and integration of smart devices.
• Heat and flame performance: Test methods for flame resistance, heat resistance, convective and radiant heat transfer, combined exposures (optional), residual strength after radiant exposure, contact heat, conductive/compressive heat, and thread heat resistance.
• Mechanical properties: Tensile strength, tear strength, seam strength, abrasion resistance (optional), and dimensional stability after cleaning.
• Liquid, particulate and viral resistance: Water penetration, particulate resistance (normative particulate test), liquid runoff penetration; viral penetration testing is optional.
• Thermal comfort and wearability: Measures such as evaporative resistance (RET) and other comfort metrics are included.
• Additional/optional tests: Garment flame engulfment using instrumented manikin, drag rescue device (DRD)/lifeline, molten aluminium splash, high visibility requirements, and hardware corrosion resistance.
• Quality and documentation: Sampling, pretreatment (conditioning, laundering), marking, and manufacturer’s instructions with required test-result detail.

Applications - who uses this standard

• PPE manufacturers and designers developing structural firefighting garments to meet internationally harmonized test methods and performance claims.
• Independent test laboratories performing the specified tests (heat, flame, particulate, mechanical).
• Procurement officers, fire services and safety managers specifying minimum performance for PPE in tenders and acceptance testing.
• Regulators and certification bodies using ISO 11999-3:2025 as a benchmark for compliance and conformity assessment.
• Risk assessors and technical advisors (see ISO/TR 21808 for firefighter risk assessment guidance).

Related standards

• ISO/TR 21808 - Firefighter risk assessment guidance
• ISO 15538 - Reflective protective clothing for very high-risk exposures
• ISO 15384 / ISO 16073-3 - Wildland/bushfire firefighting clothing

ISO 11999-3:2025 helps ensure firefighter protective clothing achieves consistent, documented levels of heat, flame and particulate protection while supporting informed PPE selection, procurement and certification.