Today we are the bridge manufacturers rightCable traysHow to test the flame retardant performance of the cable tray to make a detailed description, the flame retardant performance of the cable tray refers to the resistance to the combustion delay of the flame and the speed of flame spread. The purpose of testing flame retardant properties is to ensure that cable trays provide sufficient time and space for evacuation and extinguishing of firefighters in the event of a fire.
1. Test Method.
1.Burn delay test.
The Burning Delay Test is to evaluate the ignition time of a cable tray, and the commonly used test methods are as follows:
Vertical Combustion Test: The specimen is placed vertically under the flame to determine the combustion delay time.
Horizontal Combustion Test: The specimen is placed horizontally below the flame to determine the combustion delay time.
Directional combustion test: The specimen is fixed at an angle of inclination and the combustion delay time is determined.
2.Flame spread speed test.
The flame spread velocity test is to evaluate the speed of flame spread on a cable tray, and the commonly used test methods are as follows:
Vertical propagation test: The specimen is placed vertically, the specimen is ignited in the upper part for a length of time, and the time for the flame to spread to the lower part is determined.
Horizontal Spread Test: The specimen is placed horizontally, the specimen is ignited at one end, and the time it takes for the flame to spread to the other end is determined.
3.Flame retardancy rating test.
The flammability rating test evaluates the flame retardancy performance of a cable tray according to international standards, which typically include UL 94, GB T 51697. IEC 60332, etc. Depending on the standard, cable trays are classified into different flame retardancy ratings, such as V-0, V-1, V-2, etc.
2. Test equipment and instruments.
1.Combustion test chamber: A device used to perform combustion delay and flame spread rate tests that provide stable combustion conditions and control measurement parameters.
2.Flame**: The flame source used in the combustion test chamber is commonly used as a bunsen burner, fireworks, nozzles, etc.
3.Timer: A device used to measure the time of combustion delay and the time of flame spread.
4.Thermometer: Used to measure the temperature change of the specimen when it burns.
5.Visual observation equipment: such as high-speed cameras, camcorders, etc., used to record the combustion process.
3. Test steps.
1.Prepare the specimen: cut the cable tray into specimens of a certain size, clean the surface of the specimen, and ensure that the surface is free of impurities and particles.
2.Burn delay test.
a.The specimen is placed in the test equipment and tested according to the selected test method. For example, if you choose a vertical burn test, the specimen is placed vertically below the flame.
b.Light the flame source and start the timer.
c.Observe the combustion process of the specimen and record the ignition time of the specimen.
3.Flame spread speed test.
a.The specimen is placed in the test equipment and tested according to the selected test method. For example, if you choose a vertical spread test, place the specimen vertically and ignite one end of the specimen.
b.Start the timer and observe the spread of the flame on the specimen.
c.Stop the timer when the flame spreads to the other end of the specimen and record the flame spread time.
4.Flame retardancy rating test.
a.Depending on the selected standard, the specimen is subjected to a grading test. For example, using the UL 94 standard, the specimen is placed in a combustion test chamber for a vertical combustion test.
b.Observe the combustion process of the specimen, and judge its flame retardancy rating according to the requirements of the standard.
Fourth, test results and analysis.
Based on the burned delay time, flame spread time and flame retardancy ratings obtained from the test, the flame retardant performance of cable trays can be evaluated and compared.
The lower combustion delay time and flame spread velocity, as well as the higher flame retardancy rating, indicate that the cable tray has good flame retardant performance, providing more time and space for evacuation and extinguishing of firefighters in the event of a fire.
The test results can provide a reference for users to choose a suitable cable tray, and can also provide a basis for the formulation and improvement of relevant standards. At the same time, for cable tray manufacturers, the test results are also an important basis for the evaluation and improvement of product quality and safety performance.
In summary, the flame retardant performance of cable trays is evaluated by the Combustion Delay Test, the Flame Spread Rate Test, and the Flame Retardancy Rating Test. The testing process requires the use of equipment and instruments such as combustion test chambers, flames**, timers, thermometers, and visual observation devices. The test results can be used to evaluate and compare the flame retardant performance of cable trays, provide a reference for users to choose suitable cable trays, and also provide a basis for the formulation and improvement of relevant standards.