The multi-cell ageing oven from Wewon Environmental Chambers Co., Ltd. is used to judge the thermal effect on the quality of thermoplastic insulation and sheath. It is a professional equipment for electric operation and thermostatic control, and the machine has a controlled airflow. The way air enters the furnace is: it flows across the surface of the test sample and leaves near the top of the furnace. The multicell ageing oven will be equipped with aluminum tubes with an inner diameter of 100 mm and a length of 300 mm. Each tube has a bracket to hang the sample. Each pipeline will be equipped with timers, temperature controllers and rotameters.
|IEC Standards||BS Standards||AATCC Standards|
|UL Standards||EN Standards||ASTM Standards|
Ageing is the process by which any material degrades with time. This is true for all things living and non-living. The natural process of ageing for most materials takes a very long time. However, scientists / engineers / quality control professionals investigating materials require this to be done in a very short time. The best and proven method to perform this process on rubber that is as close to natural degradation as possible is by using an ageing oven. An ageing oven is very different from a regular lab oven. There are a lot of factors which decide whether the ageing of a material done artificially in a lab is close enough to natural ageing. Some of these factors include:
● Temperature stability over space and time｜IEC 60811-405 Electric and optical fibre cables – Test methods for non-metallic materials – Part 405: Miscellaneous tests – Thermal stability test for PVC insulations and PVC sheaths
● Replacing fresh air inside the oven｜IEC 60216-4-3
● Maintaining a very low air velocity inside the oven when replacing air
● The conventional lab ovens use a ventilator / fan inside the chamber which completely evaporates additives in the material being aged thereby losing the authenticity of ageing when compared with the natural process.
The thermal endurance of insulating materials is essential for use in the selected application, particularly for materials containing the organic compounds. Use of the specific insulation in a particular application must be complying with strict temperature management of electrical equipment. Therefore the insulating materials classification into thermal classes and accelerated ageing procedures to determine their characteristic parameters were introduced. Proposed article mainly deals with the thermal endurance properties and the ageing of electrical insulation. Thermal classes, related materials, ageing temperatures, ageing ovens and other are shown.