Re: Acoustic impedance of SBR rubber The Panametrics-NDT group at Olympus NDT has a lot of experience with ultrasonic testing of rubber tires. Most of our customers have been interested in measuring thickness of rubber over reinforcing plies, but we have also done through transmission flaw detection to find tread separation. We have an application note on the subject on our web site. What exactly do you need to do?
The acoustic impedance of butyl rubber is approximately 2 MRayl.