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ASTM D7635/D7635M-10

(Test Method)

Standard Test Method for Measurement of Thickness of Coatings Over Fabric Reinforcement

Standard Test Method for Measurement of Thickness of Coatings Over Fabric Reinforcement

SCOPE
1.1 This test method covers measuring the thickness of the coating over fiber backing or reinforcing fabric.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.3 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
31-May-2010
ICS
91.080.40 - Concrete structures
Technical Committee
D08 - Roofing and Waterproofing
Drafting Committee
D08.18 - Nonbituminous Organic Roof Coverings
Current Stage
Ref Project

Relations

Replaced By
ASTM D7635/D7635M-18 - Standard Test Method for Measurement of Thickness of Coatings Over Fabric Reinforcement
Effective Date
01-Nov-2018
Referred By
ASTM D7465/D7465M-15(2023) - Standard Specification for Ethylene Propylene Diene Terpolymer (EPDM) Sheet Used In Geomembrane Applications
Effective Date
01-Jun-2010
Referred By
ASTM D4434/D4434M-21 - Standard Specification for Poly(Vinyl Chloride) Sheet Roofing
Effective Date
01-Jun-2010
Referred By
ASTM D4637/D4637M-15(2021)e1 - Standard Specification for EPDM Sheet Used in Single-Ply Roof Membrane
Effective Date
01-Jun-2010
Referred By
ASTM D6878/D6878M-21 - Standard Specification for Thermoplastic Polyolefin-Based Sheet Roofing
Effective Date
01-Jun-2010
Referred By
ASTM D6754/D6754M-23 - Standard Specification for Ketone Ethylene Ester Based Sheet Roofing
Effective Date
01-Jun-2010

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ASTM D7635/D7635M-10 - Standard Test Method for Measurement of Thickness of Coatings Over Fabric ReinforcementASTM D7635/D7635M-10 - Standard Test Method for Measurement of Thickness of Coatings Over Fabric Reinforcement
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ASTM D7635/D7635M-10 - Standard Test Method for Measurement of Thickness of Coatings Over Fabric Reinforcement
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7635/D7635M − 10
Standard Test Method for
Measurement of Thickness of Coatings Over Fabric
1
Reinforcement
This standard is issued under the fixed designation D7635/D7635M; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
reapproval. A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4.1.1 Light Source—If the light source on the microscope is
not adequate, use a small high-intensity lamp.
1.1 This test method covers measuring the thickness of the
4.1.2 Stage Micrometer, 25 µm [0.001 in.] divisions.
coating over fiber backing or reinforcing fabric.
4.2 Calibrated Viewing Device—A digital or analog device
1.2 The values stated in either SI units or inch-pound units
designed to provide an enlarged electronic image with calibra-
are to be regarded separately as standard. The values stated in
tions to provide measurements.
each system may not be exact equivalents; therefore, each
system shall be used independently of the other. Combining
5. Calibration Procedure
values from the two systems may result in non-conformance
with the standard. 5.1 Place a standard reflectance stage micrometer or cali-
brated sample blocks in place of the specimen.
1.3 This standard may involve hazardous materials,
operations, and equipment. This standard does not purport to 5.2 Turn on the light source.
address all of the safety concerns, if any, associated with its
5.3 Position the viewing device (calibrated reticule or cam-
use. It is the responsibility of the user of this standard to
era) such that the scales are superimposed. For electronic
establish appropriate safety and health practices and deter-
imaging, place the calibrated scale marker on the microscope
mine the applicability of regulatory limitations prior to use.
stage. Focus the viewing device on the specimen.
2. Referenced Documents
5.4 Calibrate using micrometer or calibrated sample blocks
2
to nearest 10 µm.
2.1 ASTM Standards:
D4434SpecificationforPoly(VinylChloride)SheetRoofing
5.5 If using digital image for calibration step, record reso-
E177Practice for Use of the Terms Precision and Bias in
lution and magnification of calibration image.
ASTM Test Methods
E691Practice for Conducting an Interlaboratory Study to
6. Specimen Preparation
Determine the Precision of a Test Method
6.1 Make a clean cut perpendicular to the plane of the
specimen,normaltooneofthethreadintersections,completely
MEASUREMENT METHOD
throughthesheetexposingtheareatobemeasured(seeFig.1).
3. Principle
6.2 Remove the razor-cut section and mount with the cut
3.1 The thickness of coating material over fiber, fabric, or
surface (analytical plane) facing downward into a sample clip.
scrim can be measured with a standard or digital optical or
Securesampleclipin3.175-cm[1.25-in.]samplecupwithcap.
reflectancemicroscope.Measurementismadewithacalibrated
Use a piece of double-sided tape to securely attach clip to the
viewing device.
cap part of the cup. Record sample orientation and position
within cup. Multiclips can be used for mounting multiple
4. Apparatus
samples per mount. Assure all that all samples are oriented
4.1 Microscope, 30 to 100× magnification capability.
normal to the plane of the sample cup cap.
6.3 Mixedlong-cureepoxyataratioof6.3partsresintoone
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD08onRoofing
part hardener, per volume. A 3.175-cm [1.25-in.] mount
and Waterproofing and is the direct responsibility of Subcommittee D08.18 on
Nonbituminous Organic Roof Coverings. requires 19 ml of epoxy.
Current edition approved June 1, 2010. Published July 2010. DOI: 10.1520/
6.4 The mounts are allowed to cure for at least 24 h at
D7635_D7635M–10.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or ambient temperature and humidity.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.5 After curing (24 hours), polish using the procedure
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. exhibited in Table 1. Clean and dry mounts after each step to
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7635/D7635M − 10
FIG. 1 Schematic of Preparation Illustrating Cuts Normal to Scrim Directions
TABLE 1 Recommended Metallographic Polishing Procedure
Grinding Lubricant Time Pressure Wheel Material Removed
Min:Sec KPa [psi] Speed (approximate)
RPM mm [mils]
320 Grit Water 0:30 241.2 [35] 300 0.7 [28]
400 Grit Water 0:30 241.2 [35] 300 0.5 [19]
600 Grit Water 0:30 241.2 [35] 300 0.25 [10]
800 Grit Water 0:30 241.2 [35] 300 0.13
...

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5.1 The pull-off strength and mode of failure of a coating from a concrete substrate are important performance properties that are used in specifications. This test method serves as a means for uniformly preparing and testing coated surfaces, and evaluating and reporting the results.  
5.2 Variations in strength results obtained using different instruments, different substrates, or different loading fixtures with the same coating are possible. Therefore, it is recommended that the specific test instrument and loading fixture be mutually agreed upon between the interested parties.  
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1.1 This test method covers procedures for evaluating the pull-off strength of a coating on concrete. Pull-Off strength of coatings for other rigid substrates is described in Test Method D4541. The test determines the greatest perpendicular force (in tension) that a surface area can bear before a plug of material is detached. Failure will occur along the weakest plane within the system comprised of the loading fixture, glue, coating system, and substrate, and will be exposed by the fracture surface.  
1.2 This test method uses a class of apparatus known as portable pull-off adhesion testers.2 They are capable of applying a concentric load and counter load to a single surface so that coatings can be tested even though only one side is accessible. Measurements are limited by the strength of adhesion bonds between the loading fixture, coating system and the substrate or the cohesive strengths of the glue, coating layers, and substrate.  
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