Testex RTMMILLIN TX-LG Linearizing Spring Micrometer Dial Gauge, Inch Units

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Testex Micrometer Dial Thickness Gauge

To be used with Testex replica Press-O-Film Tape to measure the surface roughness of blast cleaned surfaces.

The Testex Micrometer Dial Thickness Gauge is to be used with Testex replica Press-O-Film Tape to measure the surface roughness of blast cleaned surfaces.

Start measurements with the grade of tape that has the target profile closest to the center of its range. Each grade of replica tape is most accurate near the center of its specified range.

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Kit Options
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Testex TX-GAGE

Testex Micrometer Dial Thickness Gauge
Plastic Burnishing Tool
Carrying Case
Instructions
One (1) year warranty

Testex TX-KIT

Testex Micrometer Dial Thickness Gauge
Coarse and X-Coarse Tape Rolls
Training Surface
Burnishing Tool
Carrying Case
Instructions
One (1) year warranty

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Specifications
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Grade	Range When Used With Gage
Medium	5 to 75 microinch / 0.1 to 2 microns
Coarse Minus	0.5 to 1.0 mils / 12 to 25 microns
Coarse	0.8 to 2.5 mils / 20 to 64 microns
X-Coarse	1.5 to 4.5 mils / 38 to 115 microns
X-Coarse Plus	4.6 to 5.0 mils / 116 to 147 microns

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Standards Compliance
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Standards Governing Use of Replica Tape to Measure Profile

ASTM - (American Society for Testing and Materials) D 4417:

Standard Test Methods for Field Measurement of Surface Profile of Blast Cleaned Steel

NACE - International (National Association of Corrosion Engineers) RP0287:

Standard Recommended Practice: Field Measurement of Surface Profile of Abrasive Blast Cleaned Steel Surfaces Using a Replica Tape

SSPC - the Society for Protective Coatings

ISO - International Organization for Standardization: Standard ISO8503-5 Preparation of steel substrates before application of paints and related products - Surface roughness characteristics of blast-cleaned steel substrates - Part 5: Replica tape method for the determination of the profile

In cases where standards compliance is required, the full original current standard should be consulted.

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Instructions
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Locate a representative surface site.
Select grade of Press-O-Film® – 0.8 to 2.5 mils use “Coarse”, 1.5 to 4.5 mils use “X-Coarse”.
Prepare snap gage, clean anvils, adjust dial gauge to read a minus 2 mils (8 mils when anvils are shut.)
Peel Press-O-Film® from slide.
Check unexposed film with gage. Film may vary in thickness and maximum limits of profiles cannot exceed thickness of film coating.
Apply film on blasted surface.
Rub burnishing tool over the round cut-out portion of Press-O-Film®. Press-O-Film® will become darker when replicated, so make sure that the entire circular area has uniformly darkened.
Remove replica and place between anvils on snap gage, making sure replica is centered in between anvils. Gage reading is the average maximum peak to valley heights of the blasted surface. (When snap gage is adjusted as per Step 3).

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More Info
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Always confirm measurements near the ends of a given grade’s range using the next higher or lower grade of tape.

Press-O-Film Tape is also used with the Positector RTR - Replica Tape Reader

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Related Products
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Testex Press-O-Film Replica Tape Rolls

Available in Grades Medium, Coarse Minus, Coarse, X-Coarse & X-Coarse Plus

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Downloads
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Testex Micrometer Dial Thickness Gauge - Data Sheet

Testex Micrometer Dial Thickness Gauge - Brochure

Replica Tape Article - A Source of New Surface Profile Information

Testex Press-O-Film Replica Tape - Online Instructions Manual

F.A.Q.

What is replica tape?

Testex Press-O-Film replica tape consists of a layer of crushable plastic microfoam coated onto polyester film of highly uniform thickness. It is sold in a number of grades to accommodate measurements in different profile ranges.

What is Press-O-Film HT?

Testex Press-O-Film HT is an improved version of Press-O-Film (discontinued in 2010). Press-O-Film HT (High Temperature) is formulated for better performance at high temperatures (up to 140°F or 60° C) encountered in the most challenging environments.

How does replica tape work?

Replica tape consists of a layer of compressible foam affixed to an incompressible polyester substrate. When pressed against a roughened (steel) surface, the foam collapses acquiring an impression of the surface. Placing the compressed tape between the anvils of a micrometric thickness gage, and subtracting the contribution of the incompressible substrate (50 µm or 2 mils), gives a measure of the surface profile. Consequently, the thickness of the compressed tape equals the average maximum peak-to-valley profile plus the thickness of the incompressible polyester substrate. A spring-loaded micrometer gage is used to measure the thickness of the replica.

How accurate is Testex Press-O-Film Replica Tape?

There are multiple ways of expressing the accuracy or precision of an instrument or test method. The most common method in our industry is to measure on traceable standards in a calibration laboratory. This is challenging for surface profile measurement instruments because no traceable surface profile standards exist. For some instruments, such as depth micrometers (ASTM D4417 Method B), accuracy can be estimated using calibrated height standards. For replica tape, the ASTM D01.46 committee used a set of panels blasted with a range of surface profiles, and compared the results from replica tape against measurements taken on the same panels using a calibrated drag stylus micrometer (ASTM D4417 Method D). Across the 0.8-4.5 mil (20-115 micron) primary range of replica tape, the readings differed by less than ± 0.3 mils (± 9 microns), as summarized in the table below. However, this tests the accuracy of the instrument or apparatus, but not necessarily the overall test method. For most users, it is more important that measurements are consistent between the various parties (for example, the specifier or contract author, the contractor, and the inspector). Because blasted surfaces are complex, random shapes, the ability of an instrument to measure height in a laboratory is not necessarily indicative of its ability to measure surface profile in a consistent, repeatable manner in the field. In 2011 the ASTM D01.46 committee preformed an interlaboratory study, which measured the reproducibility of measurements made by multiple users and laboratories (stated as the range that 95% of measurements from all operators across all laboratories fall within). The results are summarized as follows: The accuracy/reproducibility values are specified at 3 mils in the above table, and typically vary across the range of an instrument. For Replica Tape: In summary, independent studies have shown that Testex Press-O-Film replica tape is a highly accurate measurement method with industry-leading reproducibility

Why is measuring surface profile important?

Industrial steel in bridges, ships, railcars, etc., is almost always painted or otherwise coated to prevent corrosion. Before they can be painted, these metal surfaces must be cleaned and roughened to ensure that the paint adheres. This is usually done by grit or shot blasting the surface. If the resulting surface is too smooth, the paint or coating will not stick. If the surface is too rough, the peaks may poke through the coating allowing rusting to occur.

Is it necessary to average the measurements from two pieces of replica tape?

Most international standards instruct users of replica tape to take two replica tape readings in each measurement area, and average those two readings together to yield a 'Profile Measurement'. As with any test, averaging multiple measurements improves repeatability and accuracy. If a measurement made with either Coarse or X-Coarse replica tape is in the 'overlap range' of 38 to 64 µm (1.5 to 2.5 mils), a second measurement should be taken in the same spot with the other grade of tape. If BOTH readings are in the above Overlap Range, record the average of the two measurements as the peak-to-valley roughness. If EITHER reading is outside of the Overlap Range, record it as the profile height.

ADD TO CART THE ITEMS YOU WOULD LIKE TO PURCHASE
Testex RTMMILLIN TX-LG Linearizing Spring Micrometer Dial Gauge, Inch Units	$220.00
Testex Press-O-Film Replica Tape, X-Coarse Grade, 1.5-4.5 mils / 38-115 microns, 50/Roll RTXC	$38.00
Testex Press-O-Film Replica Tape, Coarse Grade, 0.8-2.5 mils / 20-64 microns, 50/Roll RTC	$38.00
Testex Press-O-Film Replica Tape, X-Coarse Plus Grade, 4-6.5 mils / 116-127 microns, 50/Roll RTXCPLUS	$50.00
Testex Press-O-Film Replica Tape, Coarse Minus Grade, 0.5-1.0 mils / 12-25 microns, 50/Roll RTCMIN	$38.00

ADD TO CART THE ITEMS YOU WOULD LIKE TO PURCHASE

Models

Price

Testex RTMMILLIN TX-LG Linearizing Spring Micrometer Dial Gauge, Inch Units

$220.00

Recommended Accessories

PRICE

Testex Press-O-Film Replica Tape, X-Coarse Grade, 1.5-4.5 mils / 38-115 microns, 50/Roll RTXC

$38.00

Testex Press-O-Film Replica Tape, Coarse Grade, 0.8-2.5 mils / 20-64 microns, 50/Roll RTC

$38.00

Testex Press-O-Film Replica Tape, X-Coarse Plus Grade, 4-6.5 mils / 116-127 microns, 50/Roll RTXCPLUS

$50.00

Testex Press-O-Film Replica Tape, Coarse Minus Grade, 0.5-1.0 mils / 12-25 microns, 50/Roll RTCMIN

$38.00

Testex RTMMILLIN TX-LG Linearizing Spring Micrometer Dial Gauge, Inch Units

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Testex RTMMILLIN TX-LG Linearizing Spring Micrometer Dial Gauge, Inch Units

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