Ensuring the highest quality of your wire and cable specimen is imperative in staying competitive in the industry. With our comprehensive ball pressure test conducted in our state-of-the-art hot temperature chambers, You can be confident that your products meet quality standards. The ball pressure test apparatus consists of a ball pressure device with a spherical surface and a sample support plate. It is suitable for heat resistance tests on electrical casings and external parts made of all insulating materials. Maximum measurement temperature is 250 °C
Before conducting any testing, it is important to verify that the temperature of the chamber used for the tests is properly regulated. This helps prevent erroneous readings due to the extreme temperatures involved in tests such as ball pressure testing. Our chambers are equipped with a variety of temperature control features including adjustable PLC controls and smart thermostat modules for accurate readings. The temperature of the chamber should be verified using a thermocouple prior to beginning any test at an assigned level of accuracy.
|Number of Stations||One Station|
|Temperature Range||+10℃~ 200℃|
|Weights Capacity||20 N|
|Constant Temperature||Hot Air Circulation|
|Ball End Diameter||5 mm|
|Power Consumption||1000 W|
|Equipment Weight||About 70KG|
After conducting a wire and cable specimen ball pressure test in our hot temperature chambers, we employ sophisticated data analysis techniques to calculate the final results. To ensure accuracy and reliability of these results, all data points collected during the test are compared using advanced algorithms. This makes it possible to isolate any inconsistencies or irregularities in the pressure readings that may have occurred during the course of testing. By implementing these comprehensive data analysis techniques, we can guarantee accurate calculation of ball pressure results even in extreme hot temperature conditions!
In electrical products, the heat resistance, flame resistance and tracking resistance of non-metallic materials and insulating materials directly affect the safety of products. Usually, the heat resistance, flame resistance and tracking resistance of non-metallic materials and insulating materials are tested by the following test methods: ball pressure test, glow wire test and resistance (comparison) tracking index test. From the perspective of specific implementation, this paper analyzes the standards and discusses the most important factor affecting the test results in the ball pressure test – test temperature.
The ball pressure tester is composed of a pressure ball with a diameter of 5mm ±0.5mm (rolling bearing finished steel ball conforming to ISO3290-1) connected to the weight system, which is designed to exert a vertical downward force, The mass containing the stress ball corresponds to a load of 20N ±0.2N.
In the ball pressure test, the control of the sample temperature includes two aspects. The first aspect is the selection of monitoring points. The closer the thermocouple is to the sample, the closer the measured temperature is to the actual temperature of the sample. GB/T5169.21-2017 recommends installing a thermocouple at a distance of 3 mm from the center of the sample support to the upper surface of the support to measure the temperature. In actual operation, if this cannot be achieved, try to place the thermocouple as close to the sample as possible to achieve the purpose of monitoring the temperature of the sample.
The second aspect is the control of the test time under the specified temperature. The ball pressure test time of 60 minutes refers to the time from placing the loading device on the sample to taking it off. During the period when the oven is opened to place the sample and the loading device, the temperature in the oven will inevitably drop below the test temperature. Therefore, the proficiency of the test personnel and the heating speed of the oven may affect the test results. The more skilled the operation, the faster the heating speed of the oven, the easier it is to re-reach the required test temperature, and the more accurate the test results will be.
|According to the test requirements, put the ball pressure test apparatus in the heating chamber for a long enough time to ensure that the ball pressure test device has reached a stable test temperature before the test starts.||Test Methods & Instructions|
|Place the component under test on the support base so that it is in direct contact with the support base.|
|Place the surface of the tested specimen in a horizontal position, and press the steel ball against the surface. The test should be carried out in a temperature oven with a temperature specified in the standard.|
|After the test reaches the time specified in the standard, remove the ball from the sample, and after cooling according to the requirements specified in the standard, measure the diameter of the indentation of the steel ball to determine whether it is qualified.|