The Impact of Additive Selection on EVA–PU Compatibility

Additives play a critical role in EVA–PU systems, yet they are often evaluated only for their primary function. In reality, each additive also influences colloidal stability.

Dispersants, wetting agents, defoamers, and preservatives can introduce additional ionic species or interact with particle surfaces. Even small changes in additive package can destabilize an otherwise stable formulation.

Whenever possible, nonionic additives are preferred in EVA–PU systems. They provide functionality without increasing ionic strength or disrupting electrostatic balance. When ionic additives are unavoidable, their dosage should be minimized and evaluated carefully.

Compatibility testing should include all additives at realistic use levels. Testing base blends without the full additive package often leads to false conclusions.

A systematic approach to additive selection improves formulation robustness and reduces unexpected failures during application or storage.

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