Stabaxol® P POWDER

Depending on the number of acid end groups and the humidity content of the polymer to be stabilized, as well as the stabilizing effect to be obtained, it is recommended to use 0.5 - 5.0 weight-% Stabaxol® P to process millable PUR rubbers and 0.5 - 2.5 weight-% in case of polyesters, polyamides, thermoplastic polyurethanes. The most suitable dosage depends on the requirements to be met and should always be ascertained in preliminary trials. Trials have provided proof that by addition of 3 weight-% of Stabaxol® P in millable polyurethanes, hydrolysis resistance is increased by 5 times compared to unprotected material. The addition of merely 2.0 weight-% Stabaxol® P to PET increases the life time of the latter by 3-4 times.

Hydrolytic Stability of Polyester based Polyurethane Elastomers

Stabaxol® P may be processed on any unit suitable for polyester and polyamide processing that provides sufficient dispersion of the material in the polymer. With regards to the extruder equipment, experience showed that it is advisable to use a twin-screw extruder equipped with a L/D ratio > 38. Appropriate cooling of the feeding zone is recommended to avoid particle accumulation in the feeding area. At processing temperature, traces of volatile matters can escape, which may temporarily cause irritation of skin, eyes and respiratory passages. It is highly recommended to provide adequate local ventilation at all places where Stabaxol® P stabilized products are exposed to temperatures exceeding 200 °C (392 °F). In particular, it is necessary to avoid direct contact with liberated vapors.

According to experience available, if stored at about 20°C (68°F) in originally closed containers, Stabaxol® P can be kept for at least 24 months without becoming less effective. Store in cool and dry place. During transportation or in case of prolonged storage at slightly elevated temperatures, one might observe agglomeration of the particles. Please make sure that such agglomerations are being broken prior to use.