National Standard for Tungsten Heater——V, D1, D2 Type

Tungsten heater, also known as tungsten coil, which can be stranded into single or multi wires according to the samples or drawings of customers. Pure wire and doped wire are both available. After the special heat treating, it has the strong corrosion resistance and elevated temperature property with a long life time，which is widely used in thin film technology.

According to the national standard for tungsten heater, except A, B, C three types, the types of the wolfram heater also including V type, D1 type and D2 type.

The shape of V type, D1 type and D2 type are similar to each other, their rotation direction are right，the main difference is the width between the legs. Their shapes are similar with the english lowercase letter "n". From the following three picture, people can see clear distinctions among 3 types.

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