Introdução ao teste de ignitabilidade de fios incandescentes

Glow wire ignitability testing (GWIT) is a standardized method for evaluating the flammability of materials used in electrical and electronic equipment, ensuring compliance with international safety regulations. The test simulates thermal stress conditions that may arise due to overheating components, faulty connections, or short circuits, assessing whether a material ignites or sustains combustion when exposed to a heated element.

This procedure is critical across industries where material failure could lead to fire hazards, including household appliances, automotive electronics, and aerospace components. The LISUN Aparelho de ensaio de fio incandescente ZRS-3H is a precision instrument designed to conduct these evaluations in accordance with IEC 60695-2-10, IEC 60695-2-11, IEC 60695-2-12, IEC 60695-2-13, and other relevant standards.

Princípios e metodologia de teste

The GWIT procedure involves heating a standardized Nichrome wire to a predetermined temperature (typically between 550°C and 960°C) and applying it to a test specimen for a specified duration (typically 30 seconds). The primary assessment criteria include:

• Tempo de ignição: A duração antes de o provete se inflamar.
• Persistência da chama: Whether flames self-extinguish within 30 seconds after removing the glow wire.
• Comportamento do material: Dripping of molten material and formation of flaming droplets.

O LISUN ZRS-3H automates this process with high repeatability, incorporating a PID-controlled heating system, digital temperature regulation (±2°C accuracy), and real-time data logging.

Key Specifications of the LISUN ZRS-3H Glow-wire Test Apparatus

Industry Applications and Regulatory Compliance

1. Equipamento elétrico e eletrónico

Components such as relays, circuit breakers, and terminal blocks must resist ignition under fault conditions. The ZRS-3H ensures compliance with IEC 60695, mitigating fire risks in industrial control systems and power distribution units.

2. Electrodomésticos

Materials in devices like coffee makers, toasters, and washing machines undergo GWIT to verify they do not ignite when exposed to overheated internal wiring.

3. Eletrónica automóvel

With increasing electrification, automotive connectors and battery housings must pass stringent flammability tests. The ZRS-3H provides repeatable results for ISO 20653 and LV 312-1 compliance.

4. Dispositivos de iluminação

LED drivers and plastic diffusers are tested to prevent fire propagation in case of component failure.

5. Medical Devices

Critical equipment, such as MRI machines and patient monitors, must meet IEC 60601-1 flammability requirements.

Vantagens competitivas do LISUN ZRS-3H

1. Controlo de precisão: Advanced PID algorithms maintain temperature stability, reducing variability between tests.
2. Automated Data Logging: Integrated software records test parameters, facilitating compliance documentation.
3. Durabilidade: High-quality Nichrome elements and ceramic insulation ensure long-term reliability.
4. Versatility: Supports glow-wire flammability index (GWFI) and glow-wire ignition temperature (GWIT) assessments.

Scientific Data and Case Studies

A comparative study of polyamide (PA66) and polycarbonate (PC) materials demonstrated that PA66 exhibited a GWIT of 750°C, while PC sustained ignition at 650°C. Such data informs material selection in safety-critical applications.

Conclusão

O LISUN ZRS-3H Aparelho de teste de fio incandescente is an indispensable tool for manufacturers requiring rigorous flammability validation. Its adherence to international standards, coupled with high precision and automation, ensures reliable risk assessment across diverse industries.

Secção FAQ

Q1: What is the difference between GWIT and GWFI?
GWIT (Glow-Wire Ignition Temperature) identifies the minimum temperature at which a material ignites, while GWFI (Glow-Wire Flammability Index) indicates the highest temperature at which a material does not propagate flames.

P2: Com que frequência deve ser substituído o fio incandescente?
The Nichrome wire should be inspected before each test and replaced if oxidation or deformation is observed, typically after 50–100 test cycles.

Q3: Can the ZRS-3H test non-standard specimen sizes?
The apparatus accommodates specimens up to 30mm thick, but deviations from standard dimensions may require validation per applicable testing norms.

Q4: Is operator training required for the ZRS-3H?
Basic training on safety protocols and test procedures is recommended to ensure accurate results and compliance with standards.

Q5: Does the ZRS-3H support third-party calibration?
Yes, the device can be calibrated by accredited laboratories to maintain traceability to international standards.