10044 Comparison of the Resistance to Oxidation Degradation of Polyethylene Grades

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Product Number: 51300-10044-SG

ISBN: 10044 2010 CP

Author: Margit Weltschev and Friederike Deuerler

Publication Date: 2010

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Resistance to oxidative degradation by nitric acid is one of the properties selected, together with the corresponding test method and tolerances, for the comparison of polyethylene grades of one design type in a European standard on suitability proof for alternative plastic resins used for packagings and intermediate bulk containers (IBCs) for the transport of dangerous goods.

Comparison of resistance to oxidative degradation of polyethylene grades and comparison of the times to failure in stacking tests with 55 % (70 %) nitric acid at 40°C and of the marginal drop heights determined in drop tests at - 18°C with pre-stored packagings made of these grades led to the same evaluation of the grades. Pre-storing the design types with 55 % nitric acid for 21 days at 40°C caused an increase of the marginal drop heights of the design types in drop tests at -18°C when compared with design types without pre-storage. Variations in a comparison of the design types produced of different polyethylene grades can be explained by applying additional examination methods such as Fourier transform infrared spectroscopy (FTIR).

Measurement of tensile strength and breaking elongation is, in principle, suitable for a comparison of polyethylene grades regarding their resistance to oxidative degradation.

Keywords: dangerous goods packagings, polyethylene grades, resistance to oxidative degradation, design type tests, FTIR spectroscopy