Overview
EN ISO 15025:2016 (ISO 15025:2016) is an international test method for evaluating limited flame spread of vertically oriented flexible materials used in protective clothing. Published by CEN/ISO, it defines controlled laboratory procedures to determine how single- and multi-component fabrics (coated, quilted, multilayer and similar constructions) respond to a small defined flame. The standard is not intended for materials exposed to restricted air supply, large intense heat sources, or for materials that show extensive melting or shrinkage.
Key topics and requirements
- Two test procedures
- Surface ignition - assesses flame spread across the face of a vertical specimen.
- Bottom-edge ignition - evaluates flame propagation from the lower edge.
- Material types covered
- Single- and multi-component textiles, coated fabrics, sandwich constructions, trims and seams (when practicable, trimmings should be tested as part of the assembly).
- Apparatus and fuel
- Specifies test apparatus details (burner construction provided in an annex) and limits the fuel gas to commercial-grade propane to improve precision.
- Sampling and specimen preparation
- Guidance on number of specimens, conditioning, hemmed specimens, seam positioning, and multilayer assemblies.
- Observations and reporting
- Definitions for reported observations, measurement of char/damaged length (normative annex), detection of flaming debris, and required test report content.
- Precision and validation
- Annexes include laboratory techniques and interlaboratory precision results to support repeatability and reproducibility.
Applications and who uses it
EN ISO 15025:2016 is used by:
- Manufacturers of protective clothing and technical textiles to validate flame-spread performance.
- Third-party test laboratories performing PPE certification and product development testing.
- PPE designers and materials engineers selecting fabrics for flame-resistant garments.
- Compliance officers, specifiers, and regulators assessing conformity with fire protection requirements.
Practical applications include evaluating garments and fabric assemblies for workwear, industrial safety clothing, and other PPE where limited flame spread is a performance requirement.
Related standards
- ISO 6941 - related test methods for flame behavior of textiles (method similarity noted in the introduction).
- ISO/TR 11610 - terms and definitions referenced by ISO 15025.
- EN ISO 15025:2002 - earlier edition superseded by the 2016 version.
- Annex ZA in the European adoption links this standard to EU Directive 89/686/EEC (essential PPE requirements).
EN ISO 15025:2016 provides a standardized, reproducible method to assess limited flame spread of garment materials - a core step for safe design, certification, and regulatory compliance of flame-protective clothing.