Testex is the manufacturer of Press-O-Film replica tape. Press-O-Film provides inspectors and researchers a simple way to obtain an impression of a surface. Press-O-Film (POF) consists of a layer of crushable plastic microfoam coated onto a polyester film of highly uniform thickness. When compressed against a roughened material, Press-O-Film accurately replicates details of its surface roughness.
A simple micrometric dial thickness gage can be applied to the replica for field measurement of the average maximum peak-to-valley roughness, or "profile, " of a replicated surface, or, .
A simple micrometric dial thickness gage can be applied to the replica for field measurement of the average maximum peak-to-valley roughness, or "profile, " of a replicated surface, or, .
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Testex Press-O-Film replica tape is available in a variety of thicknesses to facilitate profile measurement in differing ranges. The primary range for measurement with replica tape is 0.8 to 4.5 mils (20 to 115 um). Use of Coarse Minus grade (4.5 mil or >115 um) should be restricted primarily to checking measurements at the lower and upper ends of the primary range.
Note: The graphic on each piece of tape will help you remember the new (Step 9) averaging procedure. Use of Coarse Minus grade (4.5 mil or >115 um) should be restricted to checking measurements at the lower or upper ends of the primary range. Further information (pdf format) on X-Coarse Plus grade tape is available here. Step 3: Prepare the snap gage: clean anvils, adjust zero point to read minus 2.0 mils, the thickness of the incompressible substrate.
A human hair is about 2 mils (50 microns) thick and individual bacteria are 0.1 mil (2.5 microns) in size. Field profile measurements to accuracies in this range will be influenced by subtle effects. SSPC - The Society for Protective Coatings - is currently (2010) developing standardized guidance on number of measurements per unit area.
Metallization, to increase the replica's reflectivity, consists of pre-coating the foam surface with a thin (0.08 m) layer of Indium. In the flexographic printing industry metallized replica tape is used with interferometric optical profilers to check the wear on printing rolls. It is preferable to measure a replica, rather than the original, because of the cost, complexity and delicacy of these instruments.
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