Application and Technical Analysis of Glow Wire Test Apparatus in Flame Retardancy Performance Testing of Electrical and Electronic Products and Plastic Components

Abstract:
Flame retardancy performance is a core safety indicator for electrical and electronic products, household appliances, lighting equipment and their plastic components. As a high-precision testing device that simulates the flame retardant characteristics of materials under high-temperature thermal stress, the glow wire test apparatus has become a key tool for product fire safety design and compliance certification. Taking the LISUN ZRS-3H glow wire test apparatus as the research object, this paper expounds its working principle, technical parameters and standard compliance, analyzes its application scenarios in various industries, and discusses the practical value of the device in improving the accuracy and efficiency of product flame retardancy testing, so as to provide a reference for flame retardancy performance testing in related industries.

1. Introduction
During the production and use of electrical and electronic products, household appliances and lighting equipment, problems such as overload, short circuit and poor contact are likely to generate high-temperature glowing heat sources, causing combustion of non-metallic components, especially plastic components, and leading to fire safety accidents. With the continuous improvement of global requirements for product fire safety, various countries have issued strict flame retardancy performance testing standards. Glow wire testing, as a core detection method simulating real high-temperature ignition scenarios, has become a necessary link for product market access. As a special equipment for implementing this test, the accuracy, standard compliance and intelligence level of the glow wire test apparatus directly determine the scientificity and reliability of flame retardancy performance evaluation. Developed for the testing needs of electrical and electronic products and plastic components, the LISUN ZRS-3H glow wire test apparatus features both high precision and intelligence, can fully reproduce standard test conditions, and provide accurate data support for the evaluation of product flame retardancy performance.

ZRS-3H Glow-wire Test Apparatus

2. Working Principle and Standard System of Glow Wire Test Apparatus

2.1 Core Working Principle
The detection principle of the glow wire test apparatus is based on simulating the thermal stress effect of glowing components inside equipment on surrounding materials. A nichrome glow wire of specified material and size is heated to a set temperature by a large current, and then contacts the sample with standard pressure and depth. By observing indicators such as the ignition time, flame duration and flame extinction time of the sample, the ignitability, glow wire ignition temperature (GWIT) and glow wire flammability index (GWFI) of the material are determined. Its core is to restore the combustion behavior of materials when exposed to high-temperature glowing heat sources in actual use through a controllable high-temperature contact scenario, so as to realize the quantitative evaluation of the flame retardant performance of materials.

2.2 Domestic and International Standard System
The research, development and use of the glow wire test apparatus must strictly comply with domestic and international fire safety standards. At present, the mainstream standards are divided into three systems: China National Standards (GB/T), International Electrotechnical Commission Standards (IEC) and American Standards (UL). The LISUN ZRS-3H glow wire test apparatus is fully compliant with the series of standards from GB/T 5169.10-2023 to 5169.13-2024, and is also compatible with international standards such as IEC 60695-2-10:2021 to 60695-2-13:2021 and UL 746A:2023 (Clause 35). It covers the full-dimensional test requirements for glow wire flammability and ignition temperature of materials and finished products, and has become a universal testing equipment for cross-regional product compliance certification.

3. Technical Characteristics and Parameter Advantages of LISUN ZRS-3H Glow Wire Test Apparatus
As a high-precision flame retardancy testing device, the LISUN ZRS-3H glow wire test apparatus has achieved technological breakthroughs in core links such as temperature control, pressure regulation and data recording. Its key specifications and intelligent design are all in line with the industry’s testing needs, and the specific advantages are reflected in the following aspects:
• High-precision temperature and pressure control: The heating temperature of the device ranges from room temperature to 1100℃, which is continuously adjustable with a temperature measurement accuracy of ±3℃ and a resolution of ±1℃, capable of accurately reproducing the 960℃ high-temperature test conditions; the pressure of the glow wire on the sample is 0.95N±0.1N with a pressure-limiting depth of 7mm, which fully matches the 1N contact force required by the standard and ensures the consistency of test conditions.
• Full-dimensional data recording: It supports the recording of glowing time, ignition time and flame extinction time from 0.1s to 999.9s with an accuracy of ±0.1s, and is equipped with automatic recording and manual pause functions, which can completely capture the full-cycle data of sample combustion and avoid the omission of key indicators.
• Standardized core components: A nichrome (80% nickel + 20% chromium) glow wire with a diameter of φ4mm is adopted, matched with a φ1mm armored K-type thermocouple, processed and manufactured in accordance with international standards to ensure stability and temperature measurement accuracy at high temperatures; the fuselage is made of high-temperature sprayed steel structure, resistant to high temperature and corrosion, and adapted to long-term high-temperature test environments.
• Intelligent operation design: Equipped with a self-developed large LCD touch screen, clear indicator lights and remote control operation functions for convenient operation; the glow wire can automatically separate from the sample when the specified glowing time is reached, in line with the requirements of GB/T 4706.1-2024, effectively avoiding human operation errors and improving the repeatability of test data.
• Two models for adaptive scenarios: Two models are available, ZRS-3H (with cabinet, gross weight 180kg) and ZRS-3HS (without cabinet, gross weight 40kg), which are respectively adapted to the needs of fixed laboratory testing and on-site mobile testing, taking into account the professionalism and flexibility of testing.

4. Typical Applications of Glow Wire Test Apparatus in Various Industries
The detection objects of the glow wire test apparatus cover products and plastic components in various industries such as electrical and electronics, home appliances, lighting and automotive electronics. Relying on its standard compliance and comprehensive detection capabilities, the LISUN ZRS-3H glow wire test apparatus has become a core device for flame retardancy performance testing in various industries. The specific application scenarios are as follows:
• Electrical and electronic industry: For components such as mobile phone/computer casings, charger housings, and plastic brackets of refrigerators/washing machines, test their ignition risk when close to high-temperature components such as chips and resistors, verify their flame retardant stability in long-term high-temperature environments, ensure that products comply with standards such as GB/T 4706.1-2024 and IEC 60335-1:2023, and avoid machine-wide safety accidents caused by component ignition.
• Lighting equipment industry: Detect components such as LED driver power supply housings, lamp heat dissipation plastic parts, and fluorescent lamp ballast housings, evaluate their GWIT and GWFI indicators when in contact with high-temperature lamp bodies, meet the requirements of GB 7000.1-2015 and IEC 60598-1:2020, and ensure fire safety after lighting equipment is on for a long time.
• Electrical equipment industry: Test the PVC/PE insulating sheaths of household power cords and industrial control cables, as well as socket panels and switch plastic parts, verify their flame retardancy in case of short-circuit heating and current overload, comply with standards such as GB/T 18380.1-2022 and IEC 60884-1:2022, and prevent electrical fires from the source.
• Automotive electronics industry: For automotive navigation instrument housings, automotive wiring harness insulation layers, center console plastic parts, etc., test their flame retardant performance in scenarios such as high temperature in the engine compartment and high temperature inside the car under summer exposure, meet the provisions of ISO 6722-1:2019 and GB/T 2408-2021, and ensure the safety of personnel inside the car.
• Material R&D and testing field: Determine the GWIT and GWFI of general engineering plastics such as ABS, PC, PP and flame-retardant modified plastics to provide data support for enterprise material selection; at the same time, as a core device for third-party testing institutions such as SGS, UL and CQC, it completes product compliance testing and issues test reports to help enterprise products pass market access certification.

5. Industrial Value of Glow Wire Test Apparatus for Flame Retardancy Performance Testing
• Improve the level of product safety design: The glow wire test apparatus provides quantitative data for flame retardant material selection and structural design in the product R&D stage, helps enterprises identify material combustion risks, optimize product fire protection design, and improve product safety performance from the source.

• Guarantee product compliance with market access: The testing capability based on domestic and international standard systems enables products to pass certifications such as China 3C, EU CE and US UL, solve technical barriers in cross-regional trade, and enhance the international competitiveness of products.

• Promote the implementation of industry flame retardant standards: The high-precision glow wire test apparatus provides a unified and scientific test method for flame retardancy performance testing, standardizes the industry testing process, promotes the strict implementation of fire safety standards in electrical and electronic, home appliance and other industries, and drives the high-quality development of the industry.

• Reduce the incidence of fire safety accidents: Strict testing of the flame retardant performance of products and plastic components effectively reduces fire accidents caused by high-temperature glowing heat sources, ensures the safety of consumers in use, and reduces social safety losses.

6. Conclusion
As a core device for flame retardancy performance testing of electrical and electronic products, household appliances, lighting equipment and their plastic components, the technical characteristics and standard compliance of the glow wire test apparatus directly determine the scientificity of flame retardancy evaluation. With high-precision temperature and pressure control, full-dimensional data recording, intelligent operation design and comprehensive standard compatibility, the LISUN ZRS-3H glow wire test apparatus has become the preferred equipment for flame retardancy testing in various industries. It can accurately reproduce high-temperature glowing contact scenarios and provide key data support for product fire safety design and compliance certification.

Under the background of the continuous improvement of global product fire safety requirements, the application of the glow wire test apparatus will be more extensive, and its technological development will also move towards the direction of higher precision, more intelligence and more portability. In the future, it is necessary to further promote the integration of the glow wire test apparatus with the Internet of Things and big data technologies, realize the real-time transmission, analysis and sharing of test data, improve the efficiency and intelligence level of flame retardancy testing, and escort the fire safety of the electrical and electronic and related industries.