Application Insight / Recyclates · 8 min read

Coupling vs compatibilizer in fillers and recyclates

When to use coupling (matrix-filler) and when to use compatibilizer (blend/recyclate): diagnosis without a single recipe.

Two problems, two tools

Coupling treats the polymer–mineral filler interface. Compatibilizer treats the interface between distinct polymers or recyclate phases. Swapping one for the other is the most common plant mistake.

How to decide

If the symptom is mechanical drop with filler (e.g. PP+carbonate), start with coupling. If there is delamination, fish-eyes or blend/PCR loss, the axis is compatibilization — and odor may need a separate package.

▸Map: mineral filler vs blend/recyclate.
▸State filler % and resin type.
▸Trial mechanics and morphology when available.
▸Do not promise “one additive fixes all”.

Plectus funnel

Filled-compound, filled-PP and recyclate landings open the application. Request a sample of the right agent and validate in your process with engineering.