Thermally reversible strains in plasticized polyvinyl chloride

✍ Scribed by Pollett, W. F. O.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1947
• Weight: 609 KB
• Volume: 66
• Category: Article
• ISSN: 0368-4075
• DOI: 10.1002/jctb.5000660905

✦ Synopsis

POLLETT-THERMALLY REVERSIBLE STRAINS 319 Conclusion

It is considered that the most suitable method for routine determinations of tin coating weights on both hot-dipped and electrolytic tinplates is the loss in weight method using Clarke's reagent. This is the only reagent of those tested which determines total coating weights on hot-dipped plates. The validity of determinations by Clarke's method, when appropriately corrected for the amounts of iron removed, has been supported by good agreement with determinations by an iodimetric procedure incorporating a convenient correction for the iodine consumption of the bascplate.

The alkaline iodate stripping reagent is also satisfactory for coating weight determinations on electrolytic tinplates. It has the advantage that there is no deposited metal to remove before weighing, but, on the other hand, it requires heating and the end of the reaction is not as sharply defined as with Clarke's reagent.

Acknowledgements

.For the metallurgical examination of the tinplate' specimens and the microphotographs incorporated in this paper the author is greatly indebted to Mr. J. F. McNeil, Metallurgist-in-Charge, and members of the staff of the Munitions Supply Laboratories, Lidcombe, N.