Figure 1-5 Impact of biodiesel content on measured tensile strength
Figure 1-6 Impact of biodiesel content on measured hardness elevated acid number , using the decanoic acid , there is , however , a very clear interaction between the fuel and the elastomer when acid numbers are well in excess of the current limits in ASTM D6751 and this has important implications for two reasons .
First , if a biodiesel fuel is produced with high acid number or if a biodiesel fuel degrades during extended storage to yield such an extremely high acid number , there could be concerns about elastomer behavior . Such high acid numbers are unlikely to occur in practice .
Second , many of the prior studies which have been done on elastomer – biodiesel ( i . e . methyl esters of oils and fats ) interaction were prior to the implementation of oxidative reserve limits and lower acid value limits for biodiesel . In some of these studies the TAN of the fuel used is not reported . This approach could lead to inaccurate conclusions from previous studies about elastomer suitability with biodiesel meeting today ’ s ASTM standards .
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