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Replica Tape- A Source of New Surface Profile Information

Steel surfaces are frequently cleaned by abrasive impact prior to the application of protective coatings. The resultant surface profile, sometimes called an anchor pattern, is comprised of a complex pattern of peaks and valleys, which must be accurately assessed to ensure compliance with job or contract specifications. 

Product Number: 41214-808-SG
Author: David Beamish
Publication Date: 2014
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Steel surfaces are frequently cleaned by abrasive impact prior to the application of protective coatings. The resultant surface profile, sometimes called an anchor pattern, is comprised of a complex pattern of peaks and valleys, which must be accurately assessed to ensure compliance with job or contract specifications. Measured parameters include profile height, peak count, peak density and increase in surface area (rugosity). In the protective coatings industry, replica tape is widely used for quantifying surface profile. However, as with most other means of field measurement, tape determines only maximum profile height. Other measures of surface texture, no less meaningful, can, in principle, be obtained using electron or confocal microscopes or interferometric laser profilers, but these large, complex, and expensive instruments are unsuitable for field use. Replica tape provides a reverse copy of a blast cleaned steel surface. This paper re-examines replica tape as a source of many of the surface profile parameters required by coatings professionals. It explains how it is possible to obtain valuable new information from replica tape using simple, low-cost field devices.

Steel surfaces are frequently cleaned by abrasive impact prior to the application of protective coatings. The resultant surface profile, sometimes called an anchor pattern, is comprised of a complex pattern of peaks and valleys, which must be accurately assessed to ensure compliance with job or contract specifications. Measured parameters include profile height, peak count, peak density and increase in surface area (rugosity). In the protective coatings industry, replica tape is widely used for quantifying surface profile. However, as with most other means of field measurement, tape determines only maximum profile height. Other measures of surface texture, no less meaningful, can, in principle, be obtained using electron or confocal microscopes or interferometric laser profilers, but these large, complex, and expensive instruments are unsuitable for field use. Replica tape provides a reverse copy of a blast cleaned steel surface. This paper re-examines replica tape as a source of many of the surface profile parameters required by coatings professionals. It explains how it is possible to obtain valuable new information from replica tape using simple, low-cost field devices.

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