ISO 6941 Vertical Burning Test Chamber

ISO 6941 Flammability Test Chamber Textile Fabrics Burning Tester

The ISO 6941 Flammability Test Chamber is used to assess the flame spread behavior of textile fabrics when exposed to a defined flame under controlled laboratory conditions. A specified burner applies a flame to the surface or bottom edge of a vertically oriented specimen for 10 seconds, and the time for the flame to reach successive marker threads is recorded.

This equipment is widely used by textile manufacturers, testing laboratories, and quality control departments to evaluate the flammability performance of various textile materials, including coated fabrics, multi-layer textiles, and industrial fabrics.

Technical Parameters

Professional Construction & Technical Precision

The ISO 6941 Flammability Test Chamber is built with a robust structure and a spacious test chamber to ensure proper airflow around the specimen during testing. This design helps maintain stable test conditions and minimizes external interference with flame behavior.

The equipment is equipped with an automatic ignition system and a precision gas flow regulator, enabling consistent and repeatable flame application. High-quality components are used throughout to maintain stable flame height and reliable ignition performance, which are essential for obtaining accurate and repeatable flame spread measurements in accordance with ISO 6941.

Testing Principle

According to ISO 6941, a defined flame from a specified burner is applied for 10 seconds to the surface or bottom edge of a vertically oriented textile specimen. The time taken for the flame front to travel between three marker threads positioned at fixed distances from the igniting flame is recorded.

This method allows for the evaluation of flame spread rate and afterflame/afterglow behavior of textile materials under controlled conditions.

Common Error Mitigation

To obtain accurate and consistent flame spread test results, the following practices are recommended:

• Ensure the specimen is properly mounted and tensioned on the specimen holder.
• Verify that the flame height is correctly adjusted before each test.
• Use clean and properly conditioned marker threads of the specified linear density.
• Perform testing in a draft-free environment to avoid influencing flame behavior.
• Record ambient temperature and humidity as required by the standard.
• Regularly calibrate the timing device and gas flow system.

Applications & Use Cases

This ISO 6941 Vertical Burning Test Chamber is used to evaluate the flame spread properties of vertically oriented textile materials under controlled laboratory conditions. It is suitable for single-layer fabrics, coated fabrics, multi-layer textiles, quilted products, and sandwich-type materials.

• Textile and coated fabric manufacturers — Conducting in-house vertical flame spread testing to evaluate the flammability performance of apparel fabrics, upholstery textiles, and coated materials during product development and quality control.
• Third-party testing laboratories — Performing ISO 6941 compliance testing and issuing formal test reports for textile products, supporting certification and regulatory submission requirements.
• Quality control departments in garment and home textile factories — Carrying out routine flammability verification of incoming fabrics, finished garments, curtains, and bedding products to ensure batch-to-batch consistency.
• Automotive interior material suppliers — Assessing the flame spread behavior of textile materials used in vehicle interiors, supporting testing needs related to UN ECE R118 and other automotive flammability standards.
• Research institutions and universities — Studying flame propagation characteristics, afterflame, and afterglow behavior of novel textile structures, multi-layer materials, and flame-retardant coatings under standardized vertical burning conditions.

Key Advantages

This Vertical Flame Spread Tester is equipped with an automatic ignition system and adjustable flame height control from 5 mm to 100 mm, enabling efficient and repeatable testing. The spacious chamber design maintains adequate distance between the specimen and inner walls, ensuring stable airflow during flame application.

The equipment features a high-precision timing device (0–9999 × 0.1 s) and standardized marker threads positioned at 244 mm, 394 mm, and 544 mm, allowing accurate measurement of flame spread times. Its robust construction and stable gas flow regulation help laboratories achieve consistent results with reduced operator variation.