National Standard for Tungsten Heater——Technical Requirements

Because that tungsten heater has a high melting point and high corrosion resistance, it is widely used in vacuum metallizing, aluminizing and other decorative items, chromeplate and other mirrors, plastic products. At present, with the rapid development of technology, vacuum coating technology become more and more popular in the world. Thus, manufacturers and buyers and sellers should have knowledge about heated tungsten national standard, in order to improve production quality and level of sales of the products.

Trademarks of wolfram heater include WJ₀Z, WJ₁Z, WJ₂Z, WJ₃Z, and their materials are WJ₀, WJ₁, WJ₂, and WJ₃. The first three grades of wolfram heater are mainly used as heating elements for electric vacuum steam for aluminizing, plastic and aluminum mirror evaporated coating and others. WJ₃ grade wolfram heater is mainly used as heating element for mirror aluminizing, plastic coating and others.

The technical requirements for wolfram heater should meet the following requirements:
1. The chemical composition of the tungsten heater should be consistent with the article 2.1provision of GB4181 "tungsten wire".
2. Life time of wolfram heater: the life time of a wolfram heater for aluminizing in an electric vacuum device cannot be less than 8 times, the life time of a wolfram heater for other areas cannot be less than 10 times
3. The surface of the tungsten products should be a silver-gray and bright, without any obvious glitches, cracks and oxidation phenomena.

Test method has the following requirements:
1. In accordance with the technical requirements of tungsten products in the first, chemical composition should be in accordance with the article 2.1 in GB4181 "tungsten wire" for analysis.
2. In accordance with article IV of the technical requirements, firstly, the surface quality can be inspected visually, and if there is something not sure, operators can use a magnifying glass to test.

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