Technical Glossary Low-molecular-weight siloxane

[Low-molecular-weight siloxane]

A dimethyl polysiloxane, which is a main component of silicone products, with a low molecular weight and where both ends form a ring is called cyclic polysiloxane. This low-molecular-weight siloxane (cyclic polysiloxane) is, depending on the number of Si atoms, called D3, D4, D5 ・ ・ ・ (the figure is D3) . With a lower D, low-molecular-weight siloxane has smaller molecular weight and therefore more volatile. However, D3 is extremely volatile, so it is not included in silicon products.