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Winblast Srl

Via Roma, 181
I - 26020 SPINADESCO (CR)
Phone +39 0372 173 0267 - E Mail : info@winblast.it

© 2023 Winblast Srl - All rights reserved - VAT number 01730190194

+39 0372 173 0267

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The replica tape is a simple and practical tool used to measure the roughness of profiles after shot blasting. It produces a sufficiently accurate impression of the surface profile and can be used on any metal surface that has been blasted before the application of protective coatings. The measurement produced can be compared to traditional Rz values expressed in microns or mils and measured with a linear surface indicator.

The model provided by the Testex replica tape takes into account the peak-valley profile that appears during abrasive projection. As a result, it provides a quick estimate comparable to other technical evaluations. The Testex replica tape is a tool recommended for use together with other measuring devices in order to ensure quick and precise analyses of profile roughness following shot blasting processes.

Recommendations

As indicated above, two crucial factors must be taken into consideration:

Do not apply excessive pressure with the plastic wand on the Press-O-Film Testex Replica Tape. This operation must be performed gently
Pay attention to any sources of strong environmental heat

Comply with ASTM D 4417-03 standard to properly measure surface profiles: “Standard test methods for field measurements of surface profiles of blast cleaned steel”

How to use

First of all, make sure that the sandblasted surfaces are clean according to ISO Sa 2.5 or Sa 3 standards.

Once you have selected the right blasted area, detach a new section from the roll and remove the thin protective film from the adhesive side. Use your thumb to apply the Testex replica tape to the metal. Make sure the test is completely attached to the surface. The central circle contains a thin layer of gel that is liquid enough to penetrate the roughness of the profile and viscous enough to retain the impressed replica until the final measurement.

Apply constant pressure while making concentric circles in the central part of the test using a plastic stick with a rounded tip (included in the Testex replica tape kit). This will help the gel penetrate the roughness of the profile. The movement is quite simple, but we advise you not to apply too much pressure so as not to risk damaging the test or the roughness itself! Initially, black dots will appear and the circles will progressively cover the entire central part until the Testex replica tape is almost completely blackened.

Then carefully remove the Testex replica tape from the surface.

Use the manual gauge (also known as the Elcometer 124 thickness gauge)

Place the Press-O-Film Testex Tape imprint on the base of the measuring gauge and slowly lower the marker to read the roughness produced by the blasting process.

Now you can see the measured roughness directly on the dial, expressed in microns or imperial units. Don't forget to subtract 50 microns from the dial reading, which corresponds to the thickness of the Testex replica tape.

Winblast Srl