ISO 6941:2026 Explained: Flame Spread Testing for Vertically Oriented Textile Fabrics
ISO 6941 is an international textile fire-test standard used to measure flame spread times on vertically oriented textile specimens exposed to a small, defined flame.
The test can be applied to conventional textile fabrics as well as industrial products made from coated, quilted, multilayered or sandwich textile constructions.
This guide explains the current ISO 6941:2026 edition, how the test is performed, what results may be reported and why buyers should avoid treating one flame-spread result as a universal declaration of product safety.
What Is ISO 6941:2026?
ISO 6941:2026 is titled Textile fabrics — Burning behaviour — Measurement of flame spread properties of vertically oriented specimens.
It specifies a method for measuring the time taken by a flame to spread across defined positions on a textile specimen mounted in a vertical orientation.
The 2026 edition was published in May 2026 and replaces the withdrawn ISO 6941:2003 edition. Buyers, suppliers and testing laboratories should identify the exact edition in purchase specifications and test reports.
What Does ISO 6941 Measure?
ISO 6941 focuses on the flame-spread behavior of a vertically mounted textile after exposure to a defined ignition flame.
Depending on the test configuration and report requirements, observations may include:
Whether the specimen ignites
The time for the flame front to reach defined marker positions
Flame-spread behavior along the specimen
Flaming debris or molten dripping, when relevant
Other burning observations required by the test report or product specification
ISO 6941 is a test method. It does not establish one universal pass/fail limit for every textile product. Acceptance criteria normally come from an applicable product standard, regulation, customer specification or end-use requirement.
Which Materials Can Be Tested?
The scope of ISO 6941 includes vertically oriented textile fabrics and industrial textile products such as:
Woven fabrics
Knitted fabrics
Coated textile fabrics
Quilted textile constructions
Multilayer textile products
Sandwich textile combinations
Other industrial products based on textile constructions
Testing a multilayer or coated construction is especially important because a coating, backing, adhesive, foam or additional textile layer can change ignition and flame-spread behavior.
How Is the ISO 6941 Flame Spread Test Performed?
The detailed procedure must be conducted by a qualified laboratory using the official standard. The following is a general explanation of the process rather than a replacement for the ISO document.
1. Calling ISO 6941 a Certification
ISO 6941 is a test method. A test report records performance under defined conditions; it is not automatically a universal product certification.
2. Not Identifying the Edition
ISO 6941:2026 is now current, while ISO 6941:2003 has been withdrawn. Purchase orders and new test requests should identify the required edition.
3. Assuming ISO 6941 Provides One Universal Pass Limit
The standard measures flame-spread properties. Acceptance criteria must come from the relevant product requirement, regulation or customer specification.
4. Ignoring Coatings and Supporting Layers
Testing only the base fabric may not represent the final coated, laminated or multilayer product supplied to the customer.
5. Using a Test Result for a Different Product Batch or Construction
Changes in composition, weight, coating, finish or construction may affect flame-spread behavior and the relevance of an earlier report.
Information Buyers Should Provide
When requesting an ISO 6941 test, sample or quotation, buyers should provide:
Final product application
Destination country and market
Required ISO 6941 edition
Applicable product standard or pass criteria
Fiber composition
Fabric weight and width
Coating, backing or lamination requirements
Color and finishing requirements
Washing, cleaning or aging pre-treatment
Required laboratory and documentation
Frequently Asked Questions
What Is the Current Version of ISO 6941?
ISO 6941:2026 is the current edition. It was published in May 2026 and replaces the withdrawn ISO 6941:2003 edition.
Does ISO 6941 Measure Ease of Ignition?
ISO 6941 primarily measures flame-spread properties. ISO 6940 is the related method focused on ease of ignition for vertically oriented textile specimens.
Can Coated Fabrics Be Tested?
Yes. The scope includes coated and other multi-component textile constructions. The report should clearly identify the coating and complete tested structure.
Does ISO 6941 Have One Universal Passing Grade?
No. ISO 6941 provides a measurement method. Product-specific acceptance criteria normally come from another standard, regulation or customer specification.
Can an ISO 6941 Result Be Used for Every Color?
Not automatically. Dyes, pigments and finishing recipes may influence burning behavior. The required color range and testing strategy should be confirmed with the buyer and laboratory.
Does a Pass Result Mean the Fabric Is Fireproof?
No. A result describes the behavior of a specific specimen under defined test conditions. No textile should be described as completely fireproof solely because of an ISO 6941 result.
Conclusion
ISO 6941:2026 provides an internationally recognized method for measuring flame-spread times on vertically oriented textile fabrics and industrial textile products.
It can be used for conventional fabrics as well as coated, quilted, multilayered and sandwich constructions. However, the reported result applies to the specific material and test conditions identified in the report.
Buyers should identify the correct edition, final product application, complete textile construction, pre-treatment and acceptance criteria before requesting testing or placing an order.
Looking for a Flame-Retardant Textile Solution?
Contact KIGI TEXTILE to discuss flame-retardant woven fabrics, coated textile constructions and application-specific testing requirements. Please include the final application, required standard, fabric specifications and destination market. Request a Sample or Quotation
