Physical Test Methods for Elastomers by Roger Brown

Author:Roger Brown
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

14.4.3 Standard Methods

This will be a very brief section because the present situation is that the only ISO, BS and ASTM standards to cover forced vibration dynamic apparatus are the guides [1, 2] discussed earlier in the chapter, plus the ASTM moving die processability test covered in Chap. 5.

It is an illustration of development in standardisation to note that the 1964 edition of BS903:Part A24 described three particular types of apparatus in an appendix, whereas the 1976 edition simply required that any apparatus could be used as long as it met the stated performance requirements. From this, we reach the present situation where ISO, BS and ASTM all take the approach of only giving guidelines. The logic behind this trend is that, with so many different machines, particularly analysers, in use there would have to be multiple standards if they were all to be specified precisely. ISO TC 61 took the multi-standard approach for plastics, but the rubber standards committees concluded that this was unwieldy and that it was more useful to simply advise on the advantages and disadvantages or limitations of the various factors and to recommend tolerances and general procedures. This is compatible with the fact that dynamic properties are not often specified for rubber materials.

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