Seek help: Anti-yellowing additive for the E-TPU Popcorn series, HGT 3689 at level 3.5 or higher
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Looking for TPU foam anti-yellowing solutions, thank you!
It is understood that the anti-yellowing effect of formamidine derivatives is poor on E-TPU, while a formulation using benzotriazole UV absorbers can achieve level 4. Is there anyone who knows a lot about this?
For TPU foaming, it was found that amidine-based UVA (UV-3) agents worked well, while benzotriazole agents had the drawback of poor initial color