11373 Comparison of the Notched Impact Strength at -30C of Polyethylene Grades with the Test Performance Behavior of Packagings for the Transport of Dangerous Goods

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Product Number: 51300-11373-SG

ISBN: 2011 11373 CP

Author: Margit Weltschev and Friederike Deuerler

Publication Date: 2011

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The notched impact strength at -30 °C is one of the selected properties, together with the corresponding test method and tolerances, for a comparison of polyethylene grades of one design type in the procedural rule on suitability proof for alternative plastic resins used for packagings and intermediate bulk containers (IBCs) for the transport of dangerous goods.

The marginal drop heights determined with the drop test at -18 °C after pre-storage of the test samples with 55 % nitric acid at 40 °C only partly related to the notched impact strength at -30 °C. The Charpy method is only suitable for classifying the grade in relation to toughness behavior and using this classification for comparison with other grades. Notched impact strength can provide a qualitative indication if the test samples fail under shock forces.

Conditioning the design types with 55 % nitric acid for 21 days at 40 °C causes an increase in the marginal drop heights of the design types in drop tests at -18 °C when compared with design types without pre-storage. Post-crosslinking of the grades increases stiffness because of the acidic influence.

Key words: dangerous goods packagings, polyethylene grades, notched impact strength at -30 °C, design type tests, pre-storage with nitric acid