Einar® slip additive solutions for PET • Einar® 621 is an excellent slip additive for most PET applications • Einar® 621 has high temperature stability with low volatility during processing • Einar® 621 is approved for food contact Application background . PET is widely used in the food packaging industry. In addition to its excellent mechanical and optical properties, it also exhibits very good barrier properties. However, one of the challenges of processing and handling PET is its strong surface adhesion. Therefore, slip additives are required to reduce the coefficient of friction of the polymer surface during processing, handling and application. PET is processed at higher temperatures (280 - 320ºC) and shows sensitivity towards hydrolysis. Due to hydrogen bonding, migration of additives through the PET matrix is more demanding. This means that polymer additives for PET require very specific properties. Polarity of the additive, high temperature and chemical stability during processing are all important parameters to be considered.
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