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Iso 4577

PLÁSTICO / POLIPROPILENO

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245 views8 pages

Iso 4577

PLÁSTICO / POLIPROPILENO

Uploaded by

CEAM srl
Copyright
© © All Rights Reserved
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180 4577-1969 (€) International Standard & 4577 Plastics — Polypropylene and propylene-copolymers — Determination of thermal oxidative stability in air — Oven method Prastiques — Polyoropyléne et copolyméres de propyléne — Détermination de la stabiité & Voxydation & chaud dans Fair — Méthode & Iétwve First edition — 1983-08-15 UDC 678.742.3-13 : 620.193.54 Ref. No. 1SO 4577-1983 (E) Descriptors : plastics, polypropylene, stably tests, thermal stability, high temperature tests, oxidation tests, ageing tests (materia. Prive based on & pages Foreword 180 (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of developing International Standards is carried out through ISO technical committees. Every member body interested in a subject for which a technical committee has been authorized has the Fight to be represented on that committee. International organizations, governmental ‘and non-governmental, in liaison with ISO, also take part in the work: Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Counei. International Standard 1SO 4577 was developed by Technical Committee ISO/TC 61, Plastics, and was circulated to the member bodies in May 1962. It has been approved by the member bodies of the following countries: Australia Germany, F.R. Romania Austria Hungary South Africa, Rep. of Belgium Iran Spain Brazil Israel Sti Lanka Canada Italy ‘Sweden China Jamaica ‘Switzerland Czechoslovakia Japan| United Kingdom Egypt, Arab Rep. of Korea, Rep. of USA Finland Netherlands ussR France Poland ‘The member body of the following country expressed disapproval of the document on, technical grounds India International Organization for Standardization, 1963 © Printed in Switzerland INTERNATIONAL STANDARD 1SO 4577-1983 (E) Plastics — Polypropylene and propylene-copolymers — Determination of thermal oxidative stability in air — Oven method 1 Scope and field of application This International Standard spocifies a method for the deter- rmination 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 en- vironmental conditions prevail [NOTE ~ The specified thermal levels are considered sufficiently severe +0 cause failure of commercial grades of eat stable propylene plastics within @ reasonable period of time, If desied, lower temperatures can be applied to estimate the performance of propylene plastics with lower heat stables 2. References 180 291, Plastics — Standard atmospheres for conditioning and testing. 180 1133, Plastics — Determination of the melt flow rate of thermoplastics. 10 1191, Plastics — Polyethylenes and polypropylenes in dilute solution — Determination of viscosity number and of limiting viscosity number. 1SO 1873, Plastics ~ Polypropylene and propylene-copolymer thermoplastics — Part 1: Designation. Part 2: Determination of properties.1) At present atthe stage of craft. 3. Principle Accelerated ageing of test specimens by heat in the presence of air using a forced draught oven. Visual examination and deter- rmination of the time to failure, Under the severe conditions of this test, the specimens ‘undergo degradation at a rate dependent upon the thermal en-

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