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BlastOne carries the top line surface profile gauges from top brands like DeFelsko and Testex. Whether you are seeking to measure blasted steel, concrete or textured coatings, 2D or 3D, electronically or manually – we have the gauge for you. With a price to fit every budget.
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DEFELSKO® POSITECTOR SPG SURFACE PROFILE GAUGE PROBE | Integral Digital Depth Micrometer for Blasted Steel |
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DEFELSKO® POSITECTOR® SPGS PROBE – CABLED | Cabled Digital Depth Micrometer for Blasted Steel |
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POSITECTOR REPLICA TAPE READER (RTR–PROBE ONLY) | Replica Tape Reader for Blasted Steel and Textured Coatings |
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DEFELSKO® 3D REPLICA TAPE READER | Replica Tape Reader for 2D/3D Surface Profile Parameters |
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DEFELSKO® POSITECTOR SPGTS SURFACE PROFILE GAUGE PROBE | Integral Digital Depth Micrometer for Concrete |
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TESTEX TAPE MEASUREMENT DIAL THICKNESS GAUGE | Testex Analog Spring Micrometer, mil/thou |
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| DEFELSKO® POSITECTOR SPG SURFACE PROFILE GAUGE PROBE | DEFELSKO® POSITECTOR® SPGS PROBE – CABLED | POSITECTOR REPLICA TAPE READER (RTR – PROBE ONLY) | DEFELSKO® 3D REPLICA TAPE READER | DEFELSKO® POSITECTOR SPGTS SURFACE PROFILE GAUGE PROBE | TESTEX TAPE MEASUREMENT DIAL THICKNESS GAUGE | |
| Description | Integral Digital Depth Micrometer for Blasted Steel |
Cabled Digital Depth Micrometer for Blasted Steel |
Replica Tape Reader for Blasted Steel and Textured Coatings |
Replica Tape Reader for 2D/3D Surface Profile Parameters |
Integral Digital Depth Micrometer for Concrete | Testex Analog Spring Micrometer, mil/thou |
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Learn how to maximize your protective coating and extend the lifetime of your assets
A variety of problems can arise from incorrect surface profiles. Both too much and too little can be problems. If there is insufficient profile then coating adhesion may be compromised. This is a more pronounced with high build industrial coatings. Too much profile and you risk rogue peaks. These can have very little coating film cover and risk initiating corrosion issues. Over profile can also increase paint consumption. This is a problem with thinner build coatings such as finishing coatings. Surface profile is affected by many factors including abrasive type, abrasive size, quantity of abrasive recycles, blast angle, nozzle distance, nozzle pressure, as well as substrate conditions. Both facility management and coating suppliers can specify profile. Ask them prior to starting work what their specifications are.
Achieving optimal surface profile is a critical part of surface preparation* before the application of paint, coatings, liners, and cementitious overlays. By using standardized test methods and instrumentation, identifying optimal surface profile is possible—reducing the chance of coating adhesion failure, preventing corrosion, creating ideal paint finishes, and installing resilient cementitious overlays. Measuring anchor profile is essential for QA/QC and to achieve the high-performing and resilient coatings systems that clients expect.
*See also: Soluble Salt Testing and Environmental Monitoring
There are a variety of methods available to determine surface profile and concrete surface profile (CSP) peak-to-valley height, each with differing levels of accuracy and efficiency. Depending on whether a blasted steel surface or a concrete surface is being measured, different tools and instruments can be used.
The most common methods of determining surface profile on blasted steel surfaces include depth micrometers, replica tape readers, replica tape imagers, and drag stylus roughness gages.
Depth micrometers fitted with a flat base and fine pointed probe such as the PosiTector SPG, are a low per-test-cost method that use a spring-loaded tip which drops into the valleys of a blasted steel surface to measure peak-to-valley height. With a greater range than replica tape and most stylus roughness instruments, they are a quick and reliable way of determining surface profile.
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| STEP 1
Ensure the surface is free of all dust and other contaminants |
STEP 2
Place the probe foot level on the surface to be measured |
STEP 3
The depth micrometer will display the profile height on-screen |
Replica tape readers such as the PosiTector RTR H or PosiTector RTR 3D use Testex Press-O-Film™ replica tape to determine the anchor pattern of the blasted steel substrate. It is simple, relatively inexpensive, and is particularly useful on curved surfaces.
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| STEP 1
Clean the surface with a putty to remove dust and other contaminants |
STEP 2
Place the replica tape (Testex Tape) on the substrate and burnish; the compressible foam within the tape forms a reverse replica of the surface. |
STEP 3
Insert the replica tape between the PosiTector RTR’s measurement anvils and take a reading. |
Drag stylus roughness instruments operate by dragging a stylus at a constant speed across the blasted steel surface being measured. The instrument records the up and down distances the stylus travels as it traverses across the surface and averages the vertical distance between the highest peak and lowest valley (Ra).
Some stylus roughness testers may leave scratches on the surface being measured, potentially contributing to future defects that could cause premature rusting and coatings failures. Additionally, the precise stylus assembly tends to be somewhat fragile, so field use may not be ideal. Lastly, stylus roughness tester’s probe tips can be prone to degradation and reading accuracy may suffer.
The most common methods of determining concrete surface profile (CSP) include depth micrometers, replica putty, and visual comparators.
Depth micrometers such as the PosiTector SPG TS, are a no per-test-cost method that use a spring loaded tip (60°—conically shaped) which drops into the valleys of a concrete surface profile to measure peak-to-valley height.
While less expensive methods are available, depth micrometers offer a means to quantitatively record readings in a statistically meaningful way.
Replica putty is a means of creating a permanent replica of a CSP, similar in concept to replica tape. A 2-part compound is combined then pressed into the surface of a concrete slab. It is then removed and allowed to cure. Using a comparative reference, a subjective profile is assumed.
Using molded-rubber “chips”; subjective, comparative assessments may indicate a general profile of a concrete surface. Comparative methods are efficient in that they offer a quick check, but do not provide a quantitative means to measure and record the profile of a concrete surface.
The profile of textured coatings is often challenging to measure with most depth micrometers, stylus roughness instruments, and replica tape readers due to their greater peak-to-valley heights.
Depth micrometers with an extended range of 0–60 mils (0–1,500 μm) such as the PosiTector SPG CS are an ideal choice for measuring textured coatings.
A depth micrometer is fast but it is a spot measurement only not a view of an area and the full range of highs and lows.
A profile tape reader gives a bigger picture (with some models able to provide a 3D magnification of the test area) but it takes time to apply the tape and burnish it. There is also the ongoing cost of the test strips.
The moving stylus type of profile gauge provides similar capabilities to a profile tape system but the stylus is quite delicate and is best suited to laboratory use.
There are a variety of test standards and measurement methods available to determine surface profile. Generally, the test standard will be determined by the substrate being coated and the test method will be indicated in that test standard.
Surface profile gages such as the PosiTector SPG and replica tape readers such as the PosiTector RTR H and PosiTector RTR 3D are ideal instruments for measuring the peak-to-valley height. Both types are ideal for measuring the anchor profile on blasted metals such as steel, aluminum, etc.
The PosiTector SPG TS is designed specifically to measure anchor pattern profile on concrete substrates prior to the application of coatings, paints, liners, or cementitious overlays.
Measuring surface profile (or concrete surface profile) assists the inspector in determining if optimal anchor profile has been achieved.
Peak height is commonly measured today and is usually the only parameter reported. While its importance is undeniable, one parameter alone does not fully describe the dynamics of a coating/substrate relationship.
Peak density is also an important indicator of performance. Research has shown that it is strongly correlated with coating adhesion and resistance to corrosion- perhaps even more than Peak Height. For best coating adhesion and corrosion protection, peak count should be as high as possible while ensuring complete wetting of the prepared surface.
The ideal approach is to measure peak height (H) and Peak Density (Rpc). The PosiTector RTR 3D Replica Tape Reader measures peak height (H), peak density (Spd) and additional 2D/3D roughness parameters.
ASTM D7127—defines surface profile as, “…the positive and negative vertical deviations (peaks and valleys) are measured from a mean line approximately the center of the profile being evaluated.”
ISO 8503-1—defines it as, “…generally expressed as the height of the major peaks relative to the major valleys.”
ISO 4287—”Profile that results from the intersection of the real surface by a specified plane.” Real surface being, “Surface limiting the body and separating it from the surrounding medium.
Paint and coating manufacturers will often specify ideal surface profile.
Peak Density and Peak Count measure the number of peak/valley pairs in a given length or area of the surface profile. They have been shown to be a strong determinant of coating adhesion and corrosion resistance. In fact, studies have found that peak density/count may be a better predictor of coating performance than peak-to-valley surface profile height alone.
Peak count is a 2D parameter that refers to the number of peak/valley pairs- typically expressed in peaks/mm or peaks/in. Peak Count can be measured using the PosiTector RTR 3D or a drag stylus profilometer, and is reported as Rpc per ASTM D4417.
Concrete surface profile (CSP) can be defined as the peaks and valleys found on a concrete surface—similar to that of blast profile on steel. Concrete surface profile can affect the adhesion strength of coatings, linings, and cementitious overlays. Additionally, CSP affects the overall aesthetic and performance of the coating, lining, or overlay
Surface profile gauges arrive fully calibrated and ready to measure. A Long-Form Certificate of Calibration traceable to NIST or PTB should be included, this documents actual readings taken by your instrument at the calibration laboratory on standards traceable to a national meteorology institute. Beware of ‘Certificates’ or ‘Certificates of Conformance’ offered by seemingly low-coast suppliers. These typically do not include actual instrument readings, and are often insufficient to meet common quality requirements.
Gage accuracy and correct operation can be verified using the included metal shim and glass zero plate.
The PosiTector SPG OS probe features an integral V-groove and optional Large V-groove Adapter to assist with proper probe positioning on cylindrical parts. Simply align the V-groove along the axis of the curved surface using the notches on the probe face and/or the indicator arrows on the face of the adapter.
The 60° tip complies with most test standards including ASTM D 4417 B.
30° tips are available for conformance to Australian standard AS 3994.5-C.
Roughness is measured with readings characterized in either 2D or 3D parameters.
Ra — Roughness average: arithmetic average of the absolute values of the profile height deviations within the evaluation length measured from the mean line
Rq — RMS roughness: root mean square average of the profile heights within the evaluation length measured from the mean line
Rz — Average maximum height of the profile: arithmetic average of the successive values of the maximum peak to deepest valley within each sampling interval calculated over the evaluation length
Rp — Maximum profile peak height: the distance between the highest point of the profile and the mean line within the evaluation length
Rv — Maximum profile valley depth: the distance between the deepest valley and the mean line within the evaluation length
Rt — Total profile height: the distance between the highest peak and the deepest valley within the evaluation length
Rpc — Peak count: number of peaks per unit length within the evaluation length
Rpc Boundary C1 — The boundary lines located equidistant above and below the profile mean line. A Peak is counted after the trace goes below the lower boundary line and above the upper boundary line. The default is 0.5 µm
H — Average maximum peak-to-valley height: the distance between the anvils minus the 50.8 µm (2 mils) of incompressible film
Spd — Areal peak density: the number of peaks per unit area
Sa — Average roughness: the arithmetic average of the absolute values of the measured height deviations from the mean surface taken within the evaluation area
Sq — Root mean square roughness: the root mean square average of the measured height deviations from the mean surface taken within the evaluation area
Sz — Maximum area peak-to-valley height: the vertical distance between the maximum peak height and the maximum valley depth. Commonly referred to as St
Sp — Maximum area peak height: the maximum height in the evaluation area with respect to the mean surface
Sv — Maximum valley depth: the absolute value of the minimum height in the evaluation area with respect to the mean surface
Related products: PosiTector SPG, PosiTector RTR H, PosiTector RTR 3D
ASTM D4417 defines several methods for determining the surface profile of blast cleaned steel.*
Related products: PosiTector SPG, PosiTector RTR H, PosiTector RTR 3D, PosiTest, PosiTector 6000 (ferrous or ferrous/nonferrous probes)
AS 3894.5 defines peak-to-valley similarly to the language ISO 8503-1 in that it is concerned with the relative difference in height between the peaks and valleys of a test area.* Similar to ASTM D4417 (above), it provides several methods of obtaining a surface profile measurement:
Related products: PosiTector SPG, PosiTector RTR H, PosiTector RTR 3D
SSPC-PA 17 references several ASTM and ISO standards (such as ASTM D4417, ASME B46.1, ISO 4287, ISO 8503-4, and more) to establish certain definitions and test methods. Whereas ASTM D4417 sets out the procedure for preforming a single test, SSPC-PA 17 provides guidance on the frequency and locations of those tests.
U.S. Navy NSI 009-32 is a thorough document aimed at cleaning and painting requirements to maintain U.S. Navy assets.* Referencing standards such as ASTM D4417 methods B & C (depth micrometers and replica tape, respectively.)
The SANS 5772 test standard uses a micrometer profile gauge to determine surface profile on blast-cleaned steal surfaces.*
Related product: PosiTector SPG TS
ASTM D8271 standardizes the measurement of concrete surface profile (CSP).* Similar to Method B of ASTM D4417, it defines a depth micrometer as well as the testing procedure, number of readings, and reporting requirements.
ASTM D7682 instructs the user on how to use a two-part, fast-curing putty to create a reverse-replica of a concrete surface. Once cured, it can then be used with either an ICRI visual comparator (Method A) or a specially designed spring-less micrometer (Method B) to determine the surface profile of a concrete slab.
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