How To Dilute the Viscosity of Liquid Silicone

The viscosity of liquid silicone is too thick will affect its flow performance, and it will be more difficult to deal with air bubbles, which will affect the user experience during the operation and use, we will share how to dilute liquid silicone.

First of all, let's understand the factors affecting the viscosity of liquid silicone, usually the viscosity data in the technical parameters of silicone raw materials is a measure of the viscosity of liquid silicone index parameters, the larger the value indicates that the viscosity is thicker, the thicker the proof of cross-linking molecular weight more and more closely, the hardness will also be harder, the thinner the viscosity the better the mobility, the hardness of the hardness is also more soft. Generally speaking, if the viscosity value is higher than 10000CPS, bubbles will be generated if the viscosity is not pumped, and the bubbles can be eliminated automatically if the viscosity is lower than 10000CPS.

1. Own Factors

This is the main factor, from the above analysis we can know: for the same kind of silicone, the higher the hardness will be the thicker the viscosity will be, for the same hardness of different kinds of silicone: transparent silicone > condensed silicone > translucent addition silicone. Since the viscosity of liquid silicone will affect the tear and tensile properties after curing, silicone manufacturers usually control the viscosity within a certain range.

Dilution method: For the casting of different products, the selection should be based on the actual product situation to choose the appropriate silicone raw materials, if you feel that the viscosity of the purchased silicone raw materials is too thick, you can dilute by adding silicone oil, but do not add too much, to 5% to 10% is appropriate, too much to add silicone oil will lead to the poor performance of the made silicone products, and even oil seepage.

2, Temperature Factor

For the same kind of silicone raw material, liquid silicone will look thicker at low temperature. Experienced people will find that liquid silicone bought in winter will have a thicker viscosity than in summer.

Dilution method: The influence factor for temperature can be basically ignored, because the temperature effect is tiny.

3, Storage Time

For most of the liquid silicone will thicken about 1000CPS every month, the shelf life is usually 12 months, so the longer the storage time liquid silicone viscosity will be thicker, but not after the shelf life can not be used, but the silicone will become thicker, more bubbles will be.

Dilution method: Add a certain amount of silicone oil as a diluent to adjust the fluidity. For silicone that has solidified into a ball beyond its shelf life you can consider using an electric stirring bar, as the stirring process will release heat to produce bubbles, you should wait until it cools down before using.


Related FAQs