Overview
ISO 6941:2026 defines a standardized test method for measuring the flame spread properties of textile fabrics and industrial textile products. This method focuses on vertically oriented specimens and evaluates how flames propagate when these materials are subjected to a small, defined ignition source. The standard is applicable to single-component and composite textiles, including coated, quilted, multilayered, and sandwich assemblies.
Understanding the burning behaviour and flame spread of textiles is critical in assessing fire safety, especially in industries where flame resistance is a compliance requirement. ISO 6941:2026 is an internationally recognized standard, helping ensure consistency in testing procedures and supporting regulatory and safety objectives worldwide.
Key Topics
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Scope of Testing
The method applies to vertically oriented textile fabrics and their assemblies, providing a reliable approach to assess flame spread time.
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Test Principles
A defined flame from a specified burner is directed at either the surface or the bottom edge of the specimen for a set period. The time taken for the flame to travel specific distances (indicated by marker threads) is recorded.
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Apparatus Requirements
- Mounting frames and specimen holders to secure textile samples
- Specific gas burners (e.g., using propane or butane)
- Timing devices to precisely measure flame spread intervals
- Environmental conditions specified for both conditioning and testing
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Test Procedures
- Surface ignition: Flame is applied to the surface of the specimen.
- Bottom edge ignition: Flame is applied to the lower edge.
- Multiple specimens tested in both lengthwise and widthwise orientations.
- Marker threads indicate specific distances that help in measuring flame progression.
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Reporting and Precision
The standard provides detailed reporting requirements, including material description, test conditions, and observed behaviours. The method's precision is influenced by material type and mounting, particularly for fabrics prone to sagging or shrinkage.
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Health and Safety Considerations
Emphasizes operator safety protocols, ventilation requirements, and guidelines for handling hazardous fumes and combustion byproducts.
Applications
ISO 6941:2026 is widely used in quality assurance, regulatory compliance, and research applications, particularly where fire performance is critical. Key industries and uses include:
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Textile Manufacturing
Evaluates the flammability of textiles before market release or regulatory approval.
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Protective Clothing
Essential for fire-resistant fabrics used in uniforms, workwear, and emergency response gear.
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Interior Furnishings
Applied to curtains, upholstery, and other materials in commercial, public, and residential spaces to assess fire safety.
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Automotive and Transport
Used for materials in vehicle cabins and interiors where flame retardancy is regulated.
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Building and Construction
Supports compliance for fabrics used in public spaces, hotels, hospitals, and auditoriums.
Adoption of ISO 6941:2026 helps manufacturers, suppliers, and regulatory bodies maintain high fire safety standards in textile products, supporting certification and market access.
Related Standards
- ISO 4880: Burning behaviour of textiles and textile products - Vocabulary. Defines key terms used in fire testing standards.
- ISO 6940: Textile fabrics - Burning behaviour - Determination of ease of ignition of vertically oriented specimens. Companion method to ISO 6941, focused on ignition rather than flame spread.
- ISO 2768-1: General tolerances - Part 1: Tolerances for linear and angular dimensions without individual tolerance indications. Referenced for apparatus construction.
ISO 6941:2026 is aligned with other key fire testing and textile performance standards, supporting harmonized international safety practices and regulatory acceptance. For comprehensive flammability assessment, organizations should consider the full suite of related standards and guidelines.
Open preview (PDF)Textile fabrics — Burning behaviour — Measurement of flame spread properties of vertically oriented specimens