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The “pinking effect” observed in light-coloured polymeric materials such as rubbers and plastics is a long-studied, multifactorial phenomenon. Summarising global experience, it can be concluded that pinking is a complex process triggered by weak sunlight, heat, nitrogen oxides from exhaust gases, phenolic compounds found in cardboard and plywood, chemical detergents, and other environmental factors.
What is certain, however, is that:
- pinking is reversible — under UV sunlight in open air, the pink colour disappears;
- wiping products with vinegar essence helps reduce the pink tinge;
- pinking does not affect the performance characteristics of the product.
Because the pinking of light-coloured TPE grades occurs inconsistently and is difficult to correlate with specific storage or operating conditions, the problem affects all manufacturers.
In 2019–2020, the Standard Prof Factory carried out an extensive series of year-long experiments aimed at eliminating the formulation factors responsible for pinking in light-coloured TPE grades. We guarantee that our currently produced light-coloured TPE grades are not affected by this phenomenon.
