BET vs Oil Absorption in Silica, Why These Numbers Are Not the Same

Описание: BET vs oil absorption in silica is one of the most misunderstood topics in rubber compounding.
You see both numbers side by side in filler datasheets, and many people assume they describe the same thing. They do not.

In this Technology Toolbox episode, you learn what BET surface area actually measures using nitrogen adsorption and why it represents a theoretical total surface area. You also learn why polymer chains cannot access all of that surface and why CTAB is often used as a more realistic indicator of reinforcing surface in rubber.

The video then explains oil absorption and where this number really comes from. It did not originate in rubber, but in industries like toothpaste, coatings, and cosmetics. Oil absorption measures silica structure and void volume, not surface area.

You will see why:

high BET does not always mean high oil absorption

oil absorption controls structure and viscosity build-up

BET relates more to reinforcement potential

these numbers trend together only up to a point

If you work with silica in rubber compounds, tires, or technical elastomers, this explanation will help you read filler datasheets correctly and avoid wrong material choices.

This episode sets the foundation for the next one, where the difference between BET and CTAB will be explained in detail.
Perfect for:
Engineering students
Materials scientists
Industry professionals
Chemistry enthusiasts
Anyone curious about how everyday materials work

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