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Coating Profiler for
Blasted
Metal Surfaces
Press-O-Film®
CX by Testex
Proven way to measure blast
surface profiles:
fast
 accurate
economical
storable
PRESS-O-FILM helps
protect your investment in maintenance coatings
Before expensive protective coatings are
applied, metal surfaces are usually cleaned by abrasive impact. Cleaned
surfaces must meet agreed upon profiles for acceptable coating
effectiveness and service life. But surface profiles for measurement by
conventional techniques are frequently inaccessible or impossible to
secure. Not for "Press-O-Film"!
Fast, Accurate Profiles
with Press-O-Film
 A
unique replica technique and a simple snap gage (see photo) make
possible accurate, low-cost blast surface profile measurements.
"Press-O-Film" makes surface replicas easy to obtain and
produces average maximum peak to valley readings that assure optimum
blasting effectiveness. Replicas can be stored for reference when
needed.
The accuracy of "Press-O-Film"
measurements is due to an innovative two-level film that can produce
virtually exact replicas of abrasive blast surfaces. The film is
available in thickness grades that cover the most common ranges of blast
profiles used in industry:
Coarse Grade: profiles from 0.8 to
2.0 mils (20 to 51 µm)
XCoarse Grade: profiles from 1.5 to 4.5 mils (38 to 114 µm)
Complete Press-O-Film Kits contain one Testex Thickness Gauge, one Roll Coarse Film, one Roll
XCoarse Film, one Burnishing Tool, and complete instructions for
use.
Key Standards and
Practices
- ASTM D 4417: "Standard
Test Methods for Field Measurement of Surface Profile of Blast Cleaned
Steel." Note that a special modified version of the Mitutoyo
thickness gage mentioned in this standard is available from Testex,
Inc. for use with "Press-O-Film".
- National Association of Corrosion
Engineers: Standard Recommended Practice - RP0287-87 "Field
Measurement of Surface Profile of Abrasive Blast Cleaned Steel
Surfaces Using a Replica Tape."
- Steel Structures Painting Council:
Steel Structures Painting Manual - Ch. 6, inspection. Surface
Preparation Specifications SSPC-SP5, SP6, SP10, SP11-87T.
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Accurate Replicas in Three
Easy Steps
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Step One:
Prepare and Position the Tape
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Remove the release paper and bulls-eye
that covers the pressure-sensitive tape and the replication film. With
the small square of white film facing down, position the tape strip on
the surface to be measured. Rub a finger over the entire tape area to
set the adhesive and avoid movement during replication.
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Step Two:
Burnish the Film
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Apply moderate pressure with the
burnishing tool all over the circular cut-out in the tape. When done
correctly, the burnished area will appear as a gray circle. A "pebble grain"
appearance indicates excessive burnishing pressure. Remove the tape. The
replica is now ready for measurement.
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Step Three:
Measurement
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Check the snap gage to make sure that the anvils are clean. Also check
adjustment . . . gage should read "zero" with anvils closed.
To Simplify "Press-O-Film" readings, the gage may be adjusted
to read "8" with the anvils shut. This will eliminate the need
to subtract the film base thickness from the surface measurement.
Place the replicated area between the
anvils and gently lower the movable anvil onto the film. Try the gage in
several places near the center of the replica to insure an accurate
reading.
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Other Uses for Press-O-Film
CX
Superior blast surface profile
measurements are only one of several effective uses for the Coarse and
XCoarse grades of "Press-O-Film" by Testex, Inc. Check out
these other cost-cutting ways "Press-O-Film" might help you
speed production and improve product quality:
- Nodular and rough surfaces for fiber
processing
- Rough machined surfaces (over 2.5 µm)
- Printing rolls (quality and wear life
analysis)
- Papermaking machinery
Also Available from
Testex
Press-O-Film for Micro-Surface Examination & Measurement
Testex, Inc. also produces a line of
replication films for determining surface roughness in the 0.25 - 500
microinch AA range. These grades of "Press-O-Film" meet
today's highly precise, difficult to achieve measurements for industrial
quality control, receiving inspection and documented compliance with
specified tolerances and standards.
"Press-O-Film" makes possible
accurate measurements in locations not possible with conventional stylus
devices, such as small ID surfaces, vertical and inverted surfaces,
small lands, saddle points, etc.
If you need surface profile measurements
- whether coarse or microfiine - you need "Press-O-Film" by
Testex, Inc. For more information and pricing, please contact
Corrosion Control Products Company.
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