The transparency of liquid silicone is related to viscosity. Generally, the higher the viscosity, the lower the transparency; the lower the viscosity, the higher the transparency. The following is a specific analysis:
Principle of correlation between viscosity and transparency
The viscosity of liquid silicone is mainly related to the molecular weight of siloxane, inorganic filler and curing agent. The higher the molecular weight, the greater the viscosity, the more and tighter the cross-linked molecular weight, resulting in more scattering and reflection of light when passing through, thereby reducing transparency. For example, when the solid content of silica micropowder is high, even low-viscosity silicone will become hard due to the close arrangement of molecules after curing, and the transparency will be reduced.
Transparency performance of liquid silicone with different viscosities
High-viscosity liquid silicone: usually manifested as high viscosity, poor fluidity, close intermolecular bonding, and high hardness. In this state, it is difficult for light to pass smoothly, resulting in low transparency, and it may appear translucent or opaque.
Low-viscosity liquid silicone: low viscosity, good fluidity, relatively loose molecular arrangement, and low hardness. Light can pass through the material more smoothly, so the transparency is higher and close to transparent.