Product introduction of hot wire testing machine

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Date: 2025-12-08Read: 1

In industries such as electronics and electrical appliances, plastic building materials, etc., the flame retardant performance of materials is directly related to the safety of product use. As the core equipment for evaluating the flame resistance of materials, the hot wire testing machine plays an irreplaceable role in product quality testing and compliance certification. This article will systematically introduce the core knowledge of the hot wire testing machine, helping readers to fully understand its functions and applications.

1、 What is a hot wire testing machine?

The hot wire testing machine is a specialized testing equipment designed and manufactured according to international and domestic standards (such as IEC 60695, GB/T 5169, etc.). It is mainly used to simulate the high-temperature ignition source generated by the internal hot elements (such as resistance wires, wiring terminals, etc.) of electronic and electrical products under fault or overload conditions, and to evaluate the ignition ability of surrounding combustible materials. Through this device, it is possible to determine whether the material will be ignited at a specified scorching temperature, the duration of the flame after ignition, and whether it will drip and ignite the combustible material below, in order to determine the flame resistance level of the material.

2、 Core working principle

The working principle of the hot wire testing machine is based on the core logic of "simulating high-temperature ignition". The specific process is as follows: firstly, the special material hot wire (usually nickel chromium alloy) is heated to the standard specified temperature through the built-in heating system (the common temperature range is 500 ℃ -960 ℃, which can be adjusted according to testing needs); Subsequently, under a specific pressure (usually 1N), press the hot wire onto the surface of the sample and maintain it for a specified time (usually 30 seconds); During the testing process, observe in real time whether the sample is ignited: if the sample ignites, record the duration of the flame and the duration of burning; If there are droplets on the sample, it is necessary to observe whether the droplets will ignite the ignition pad (such as degreased cotton) located 20mm below the sample; Finally, based on the test results and comparison with the standard, determine whether the material's flame resistance performance is qualified.

3、 Main core structure

A standard hot wire testing machine mainly consists of the following key components, which work together to ensure the accuracy and stability of testing:

Heating system: The core is nickel chromium alloy heating wire, matched with high-precision temperature control module, which can quickly raise the temperature and maintain it at the set temperature stably. The temperature error is usually controlled within ± 5 ℃ to ensure the accuracy of the test temperature.
Sample fixture: Used to fix the sample to be tested, the fixture angle and position can be adjusted according to the shape of the sample (such as sheet, pipe, component, etc.) to meet the testing needs of different types of samples, while ensuring that the contact pressure between the hot wire and the sample meets the standard requirements.
Transmission mechanism: responsible for controlling the lifting and movement of the heating wire, achieving automated operation of "aligning the sample - pressing contact - resetting after testing completion", avoiding errors caused by manual operation, and improving testing efficiency.
Ignition collection device: located below the sample, used to place ignition bedding such as degreasing cotton, monitor the ignition ability of sample droplets, and equipped with a protective cover to prevent flame diffusion or harmful substance splashing during the testing process.
Control system: Using PLC or microcontroller control, combined with touch screen operation interface, can set parameters such as heating temperature, contact time, observation time, etc., automatically record test data (such as ignition time, flame duration, etc.), and some high-end equipment also supports data storage and export functions.

4、 Core application areas

The application scenarios of the hot wire testing machine are concentrated in industries that require evaluation of material flame resistance, especially suitable for compliance testing of electronic and electrical products and related materials, mainly including:

Electronic and electrical industry: This is its most core application area, used to test the flame resistance of materials used in electronic and electrical components such as switches, sockets, terminal blocks, transformer housings, and home appliance housings, ensuring that products will not ignite surrounding materials due to internal burning elements and cause fires when overloaded or malfunctioning.
Plastic building materials industry: used to test the flame resistance of materials such as plastic pipes, cable sheaths, and plastic sheets for construction, ensuring the safety of construction projects and infrastructure, and avoiding fire hazards caused by flammable materials.
Automotive industry: Testing the flame resistance of automotive interior parts (such as instrument panels, door panels, wire harness wrapping materials, etc.) to comply with relevant safety standards in the automotive industry (such as ISO 3795), reducing the risk of fire caused by electrical faults during vehicle operation.
Toys and daily necessities industry: used to test the material flame resistance of contact products such as children's toys and daily necessities (such as plastic tableware, household appliance accessories), ensuring the safety of consumers, especially children.

5、 Key technical standards

The testing process and judgment standards of the hot wire testing machine must strictly comply with relevant international and domestic regulations. Common core standards include:

International standards: IEC 60695-2-10 (Glow wire test method), IEC 60695-2-11 (Glow wire flammability index test), IEC 60695-2-12 (Glow wire ignition temperature test).
National standards: GB/T 5169.10 (Fire hazard testing for electrical and electronic products - Part 10: Basic test methods for hot wire/hot wire - Hot wire test), GB/T 5169.11 (Flammability index test), GB/T 5169.12 (Ignition temperature test).

Products from different industries need to be tested according to their own compliance requirements, selecting corresponding standards to ensure that the test results have recognition.

6、 Precautions for use

To ensure testing safety and accurate results, the following points should be noted when using the hot wire testing machine:

Sample preparation: The sample should be cut to the specified size according to standard requirements, with no oil stains or impurities on the surface, to ensure consistent sample condition and avoid affecting the test results.
Equipment calibration: Regularly calibrate the temperature, contact pressure, timing accuracy, etc. of the hot wire. It is recommended to calibrate at least once a year, and the calibration should be carried out by professional organizations or personnel to ensure that the equipment meets the standard requirements.
Safe operation: During the testing process, high temperatures and flames may occur. Operators need to wear heat-resistant gloves, protective goggles, and other protective equipment. The equipment should be placed in a well ventilated laboratory, away from flammable and explosive materials, and ensure that the protective cover is closed in place.
Environmental control: The laboratory environment temperature should be maintained at 15 ℃ -35 ℃, and the relative humidity should not exceed 75% to avoid environmental factors affecting the stability of test results.
Data recording: Strictly record key parameters during the testing process (such as set temperature, contact time, ignition condition, flame duration, etc.) to ensure the traceability of test data.

7、 Development Trends

With the continuous improvement of product safety requirements in the industry, the hot wire testing machine is also developing towards intelligence, precision, and multifunctionality: firstly, intelligent upgrading, adopting more advanced control systems to achieve fully automated testing processes, automatic data analysis, and report generation, reducing manual operation errors; The second is to improve precision, optimize the heating system and temperature control module, further reduce temperature control errors, and enhance the repeatability of test results; The third is multifunctional integration, and some devices are compatible with various flame retardant testing projects such as hot wire test, needle flame test, horizontal and vertical combustion test, etc., to meet the needs of multi scenario testing and improve equipment utilization.

In summary, the hot wire testing machine, as a key equipment for testing the flame retardancy of materials, is an important defense line to ensure the safety of products in industries such as electronics and building materials. Understanding its working principle, application areas, and usage standards is of great significance for enterprises to improve product quality, avoid safety risks, and meet compliance certifications.

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