Rubber sheets and rubber coatings can be difficult to gauge with conventional mechanical thickness measurement techniques. With ultrasonic thickness gages, however, any point on the entire surface of a rubber sheet - and not just the edges - can be measured without ever having to contact the opposite side. Ultrasound waves travel through the rubber coating and reflect from the acoustic interface of the rubber and the substrate. This acoustic interface can be air, rubber-steel, rubber-composite, or other materials, as long as the outside surface of the rubber is available for probe coupling.
It is important to know the exact nature of the application since rubber coating on certain materials may require special setups in order to maintain accuracy of thickness readings.
Equipment: Thickness measurements on rubber sheets can be done with precision thickness gage models 38DL PLUS and 45MG with Single Element software Typically, these hand-held gauges in combination with appropriate transducers between 2.25 MHz and 20 MHz can measure rubber materials in the range of 0.008 to 0.250 in. (0.2 to 6 mm).The specific range will vary depending on the transducer and setup being used. Thick or attenuating rubber materials will require the HP (High Penetration)software option for the 38DL PLUS and 45MG.