They are mainly used for electric light resources, vacuum-deposited films, smelting of rare earth metals, electrical contacts, heater and so on.
钨丝、钨杆主要用于电光源、真空镀膜、稀土金属冶炼、电触点以及加热元件等。
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On the process of vacuum-deposited Al on organic coat, the film quality is affected dy gases from the organic volatile matter and water vapour in the coat.
This vacuum-deposited coating on the lens's glass surfaces reduces bothersome reflections and stray light in the image, and paved the way for today's highly complex optical systems.