Testex is the manufacturer of Press-O-Film replica tape.
Testex 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 crush-able plastic micro-foam 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.
The impression can be studied in several ways:
- A simple micrometric dial thickness gage can be applied to the replica for field measurement of the average maximum peak-to-valley roughness. Or also called “profile,” of a replicated surface.
- A digital thickness gage such as the PosiTector RTR also can field-measure profile and bridge the gap between tape grades by incorporating automatic linearization.
- to produce maps of the replica’s surface topography in laboratory setting can use an optical profiling interferometer or confocal microscope. This is most appropriate to study of subtle features at the microinch (25 nanometer) level.
Testex tape Press-O-Film or also called replica tape is available in a variety of thicknesses to facilitate profile measurement in differing ranges.
The firstly range for measurement with replica tape is 0.8 to 4.5 mils (20 to 115 um). Then use the Coarse Minus grade (<0.8 mil or <20 um) or X-Coarse Plus grade tape (>4.5 mil or >115 um) should be restricted primarily to checking measurements at the lower and also upper ends of the primary range.
|Grade (descriptive)||Range When Used With Gage
(mils) / (um)
|Fine / Medium||not applicable|
|Coarse Minus||0.5 to 1.0 / 12 to 25|
|Coarse||0.8 to 2.5 / 20 to 64|
|X-Coarse||1.5 to 4.5 / 38 to 115|
|X-Coarse Plus||4.6 to 5.0 / 116 to 127|
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