Plasty - Polypropylen a kopolymery polypropylenu - Stanovení termooxidační stability na vzduchu - Metoda v sušárně (Norma k přímému použití jako ČSN).
NORMA vydaná dňa 1.3.2020
Označenie normy: ČSN EN ISO 4577
Rozlišovací znak: 643056
Katalógové číslo: 508978
Dátum vydania normy: 1.3.2020
Počet strán: 20
Približná hmotnosť: 60 g (0.13 libier)
Krajina: Česká technická norma
Kategória: Technické normy ČSN
This document specifies a method for the determination of the resistance of moulded test specimens of polypropylene and propylene-copolymers to accelerated ageing by heat in the presence of air using a forced draught oven.
The method represents an attempt to estimate the service life of parts fabricated from propylene plastics.
The stability determined by this method is not directly related to the suitability of the material for use when different environmental conditions prevail.
The specified thermal levels are considered sufficiently severe to cause failure of commercial grades of heat-stable propylene plastics within a reasonable period of time. If desired, lower temperatures can be applied to estimate the performance of propylene plastics with lower heat stabilities