We were looking for the same info all summer - we came to find out that due to the more "recent" nature of most elastomer developments and the widely varied ways casting and molding houses do their work - there are generally not too many curves out there. We ended up building our own small test machine to develop curves and are still doing so in an onging manner. SOME manufacturers can do testing and may supply you with curves for various materials. One that I know of that has capabilities like this is:
