Hexachlorodisilane (HCDS) | 13465-77-5

Hexachlorodisilane (Si2Cl6) is a colourless, volatile liquid used to manufacture semiconductors, optical fibres, and silicone rubber. Despite its widespread use, Hexachlorodisilane is only well-known in specialised industries. In this blog post, we will explore the properties, uses, and safety considerations of Hexachlorodisilane.

Properties of Hexachlorodisilane

Hexachlorodisilane is a compound composed of two silicon atoms and six chlorine atoms, with a molecular weight of 265.88 g/mol. It has a boiling point of 147°C and a density of 1.48 g/cm³. As a highly reactive substance, it can decompose spontaneously in the presence of water, making it challenging to handle.

Uses of Hexachlorodisilane

Hexachlorodisilane has many uses across different industries, including:

1. Manufacturing of Semiconductors: Hexachlorodisilane is a key precursor in the manufacturing of semiconductors. It is used in chemical vapor deposition (CVD) processes to deposit thin layers of silicon on substrates, which are then used to create microchips, solar cells, and other electronic components.
2. Production of Optical Fibers: Hexachlorodisilane is used to produce optical fibres. It is a source of silicon for the fabrication of high-purity silica glass, which is then drawn into thin fibres for telecommunications and other applications.
3. Production of Silicone Rubber: Hexachlorodisilane is used as a precursor in the production of silicone rubber. It is reacted with water to produce polydimethylsiloxane (PDMS), which is then cured to form silicone rubber. Silicone rubber is used in a wide range of applications, including automotive, aerospace, and medical industries.

Safety Considerations

Due to its highly reactive nature, hexachlorodisilane (HCDS) requires careful handling. It should only be handled by trained professionals who are familiar with its properties and hazards. It is also toxic and can cause skin and eye irritation, as well as respiratory problems if inhaled. Therefore, appropriate personal protective equipment such as gloves, goggles, and respirators should be worn when working with hexachlorodisilane. It should only be used in well-ventilated areas, and spills should be cleaned up immediately using appropriate procedures.