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WIOPEDIA - The WIOTEC® electroplating encyclopaedia

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Mercury (Hg)

Mercury is a highly toxic, electrically conductive and liquid metal of characteristic silvery white color.

Mercury in its pure form is stable in air at room temperature and insoluble in dilute sulfuric acid and hydrochloric acid. It is soluble in concentrated sulfuric acid, nitric acid and aqua regia. Due to its extremely high surface tension, mercury forms flattened droplets on substrates instead of wetting them, which is due to its very strong cohesion.

Elemental mercury can be precipitated from mercury salt solutions with base metals. Mercury alloys with other metals are known as amalgams, especially from dental practices. The metal is used in energy-saving lamps, button cells and mercury vapor lamps. Due to the typical thermal expansion of the metal between 0 °C and 100 °C, directly proportional to the temperature, mercury is widely used and has been for a long time in thermometers. However, since it is highly toxic, its use in modern times is limited to the strictly scientific field.


Atomic mass



13546 kg/m³

Melting point

- 38,83 °C

Boiling point

357 °C

Normal potential

+0.85 V (HgHg⁺²+2e¯)

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WIOTEC® Ense GmbH & Co. KG
Auf den Geeren 9-11
59469 Ense-Höingen, Germany

WIOTEC® Arnsberg GmbH & Co. KG
Wagenbergstraße 55
59759 Arnsberg, Germany

+49 2938 97833-0
+49 2938 97833-20

From metal to precious metal
The company WIOTEC® is your specialist for surface finishing and metalworking. In our electroplating shop, which is managed according to the latest environmental standards, we are capable of finishing both small parts and long parts of up to six meters. This makes us one of the leading and most efficient decorative surface coaters in Europe.

Our most important resource is our employees - with their commitment, competence and experience. Together with them, we work out and develop individual and tailor-made solutions for our customers. From detailed consultation and planning to purchasing, mechanical and chemical pre-treatment, professional electroplating and supplementary services - WIOTEC®'s range of services leaves nothing to be desired.



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