TESTech TTech-ISO15025 Flame Spread Tester for Protective Clothing (Compliant with ISO 15025:2016 & BS EN ISO 15025:2022)

Overview

The TESTech TTech-ISO15025 Flame Spread Tester is a purpose-engineered instrument designed to evaluate the limited flame spread behavior of protective clothing textiles and laminates under controlled small-flame impingement conditions. It operates in strict accordance with ISO 15025:2016 (“Protective clothing — Protection against heat and flame — Method of test for limited flame spread”) and its harmonized European implementation, BS EN ISO 15025:2022. The apparatus implements the principle of standardized flame exposure—either horizontally applied to the fabric surface or vertically applied to the bottom edge—to assess ignition resistance, flame propagation extent, afterflame time, afterglow duration, and char length. Its mechanical and control architecture ensures high inter-laboratory reproducibility, essential for regulatory conformance testing in occupational safety certification workflows, including CE marking under EU PPE Regulation (EU) 2016/425 and compliance verification for NFPA 2112, EN ISO 11612, and EN ISO 14116.

Key Features

• Robust stainless steel combustion chamber (1200 × 600 × 1200 mm) engineered for long-term corrosion resistance, thermal stability, and optical clarity during observation.
• Dual-mode sample holder system: independently configurable stainless steel fixtures for both surface ignition (horizontal flame application) and bottom-edge ignition (vertical flame application), each meeting dimensional tolerances specified in Clause 6.2 of ISO 15025:2016.
• Imported precision burner assembly featuring a 0.19 mm orifice nozzle, calibrated for stable laminar flame geometry; flame height adjustable via fine-control needle valve (±2 mm tolerance at 25 mm horizontal / 40 mm vertical settings).
• Integrated pulse high-voltage electronic auto-ignition system eliminates manual lighting, reducing operator variability and ensuring consistent spark timing relative to gas flow initiation.
• PLC-based control architecture with 7-inch industrial touchscreen HMI enables intuitive test configuration—including user-defined ignition duration (10 s standard, adjustable), post-ignition observation period, and mode selection—without external software dependencies.
• Automated timing subsystem with 0.1-second resolution captures afterflame time, afterglow time, and total test duration; all timestamps are logged with millisecond-level traceability and stored internally with date/time stamping.
• Gas delivery subsystem incorporates dual-stage regulation: an imported analog pressure gauge (0–100 kPa range) and a stainless steel needle valve ensure repeatable propane/air mixture pressure (typically 10–15 kPa), critical for flame stability across sequential tests.
• Full audit trail capability: all test parameters, operator ID (if configured), start/stop timestamps, and raw timing data are retained in non-volatile memory and exportable via USB for GLP/GMP-aligned documentation.

Sample Compatibility & Compliance

The TTech-ISO15025 accommodates flat textile specimens measuring 160 mm × 50 mm (surface test) or 200 mm × 50 mm (bottom-edge test), mounted taut on stainless steel frames without folding or stretching artifacts. It supports woven, knitted, nonwoven, and coated fabrics—including multilayer composites used in arc-flash, molten metal splash, and flash-fire ensembles. The system satisfies mandatory pre-test conditioning requirements per ISO 139 (standard atmosphere: 20 °C ± 2 °C, 65 % RH ± 5 % RH) and post-test evaluation criteria defined in ISO 15025 Annex A (char length measurement protocol). Full alignment with ISO/IEC 17025:2017 clause 6.4.2 (equipment suitability verification) is supported through built-in calibration checks for flame height, timing accuracy, and gas pressure stability—documented in the included calibration certificate and traceable to national standards.

Software & Data Management

No proprietary PC software is required. All operational logic resides within the embedded PLC firmware, minimizing cybersecurity exposure and eliminating driver compatibility issues. The touchscreen interface provides real-time display of active test phase, elapsed time, flame status (ON/OFF), and pass/fail indicators based on user-input acceptance criteria (e.g., char length ≤ 100 mm). Test records—including specimen ID, test date, operator tag, ignition mode, flame duration, afterflame time, afterglow time, and observed damage—are stored in CSV-compatible format on internal memory and exportable via USB 2.0 port. Data files include ISO-compliant metadata headers and support integration into LIMS environments via scripted batch import. Audit logs meet FDA 21 CFR Part 11 foundational requirements for electronic records (user authentication optional via PIN, event timestamping, and immutable storage).

Applications

This instrument serves laboratories performing type approval testing for personal protective equipment (PPE) manufacturers, notified bodies conducting conformity assessments under EU PPE Regulation, and industrial hygiene departments validating in-house flame-resistant garment programs. Typical use cases include qualification of FR cotton blends, modacrylic/aramid hybrids, aluminized outer shells, and breathable laminates intended for oil & gas, electrical utilities, foundry, and firefighting applications. It also supports R&D screening of novel flame-retardant finishes, intumescent coatings, and smart textile architectures where quantitative flame spread kinetics—not just pass/fail outcomes—are required for material development cycles.

FAQ

Does the TTech-ISO15025 comply with the latest revision of ISO 15025?
Yes—it fully implements ISO 15025:2016 and its updated harmonized European version BS EN ISO 15025:2022, including revised specimen mounting instructions and expanded guidance on multi-layer system evaluation.
Can the system be used for standards beyond ISO 15025?
While optimized for ISO 15025, its burner geometry, timing resolution, and gas control fidelity allow methodologically aligned execution of ASTM D6413 (Standard Test Method for Flame Resistance of Textiles) and EN 532 (assessment of flame spread in curtains), subject to lab-specific validation per ISO/IEC 17025.
Is third-party calibration certification provided?
Each unit ships with a factory calibration report verifying flame height accuracy, timer resolution (≤0.1 s), pressure regulator linearity, and auto-ignition reliability—all traceable to NIM (China National Institute of Metrology) or equivalent national metrology institutes.
What gas supply is required?
Propane (≥95 % purity) supplied at 10–15 kPa regulated pressure; compressed air (oil-free, dew point ≤ −20 °C) at matching pressure; both delivered via 6 mm OD stainless steel or reinforced polymer tubing with Swagelok-type fittings.
How is operator safety ensured during testing?
The chamber features interlocked access door switches that terminate gas flow and ignition voltage upon opening; integrated exhaust duct (Ø150 mm) connects to facility fume hood or dedicated extraction system rated ≥200 m³/h to remove combustion byproducts per OSHA 1910.1200 and local ventilation codes.