Testex tape is used for measuring blasted surface profiles known in industry as press-o-film or replica tape.
By placing the tape on the surface and rubbing over it, the Rt (total roughness) or peak-to-valley height of the profile can be taken and then measured with a film thickness meter.
Consists of a layer of compressible foam affixed to an incompressible polyester substrate.
When pressed against a roughened/grit blasted (steel) surface, the foam collapses acquiring an impression of the surface.
One box of Testex contains tape for 50 measurements.
