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ASTM D4708-99(2004)

(Practice)

Standard Practice for Preparation of Uniform Free Films of Organic Coatings

Standard Practice for Preparation of Uniform Free Films of Organic Coatings

SIGNIFICANCE AND USE
Free films are required for conducting tests to evaluate physical properties such as tensile and elongation (Test Method D 2370), moisture vapor permeability (Test Methods D 1653), and other physical properties of organic coatings where the substrate may interfere with the determination.
The tin foil/mercury amalgamation procedure should be used only in cases where other substrates may be affected by high-temperature baking or may affect the test results.
SCOPE
1.1 This practice covers the preparation of free films of organic coatings for use in determining the physical properties of the coatings. Procedures are given for preparing free films on four alternative substrates. These substrates are dental foil, treated FEP (fluorinated ethylene-propylene) sheet, silicone coated paper, and halo-silane coated glass plates.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 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. A specific hazard statement is given in 6.1.

General Information

Status
Historical
Publication Date
31-May-2004
ICS
25.220.60 - Organic coatings
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.23 - Physical Properties of Applied Paint Films
Current Stage
Ref Project

Relations

Replaces
ASTM D4708-99 - Standard Practice for Preparation of Uniform Free Films of Organic Coatings
Effective Date
01-Jun-2004
Replaced By
ASTM D4708-07 - Standard Practice for Preparation of Uniform Free Films of Organic Coatings
Effective Date
01-Nov-2007
Referred By
ASTM D6093-97(2022) - Standard Test Method for Percent Volume Nonvolatile Matter in Clear or Pigmented Coatings Using a Helium Gas Pycnometer
Effective Date
01-Jun-2004
Referred By
ASTM D5590-17(2021) - Standard Test Method for Determining the Resistance of Paint Films and Related Coatings to Fungal Defacement by Accelerated Four-Week Agar Plate Assay
Effective Date
01-Jun-2004
Referred By
ASTM C1841-23 - Standard Specification for Interior Radiation Control Coating (IRCC) for Building Applications
Effective Date
01-Jun-2004
Referred By
ASTM E1795-20a - Standard Specification for Non-Reinforced Liquid Coating Encapsulation Products for Leaded Paint in Buildings
Effective Date
01-Jun-2004
Referred By
ASTM D1653-13(2021) - Standard Test Methods for Water Vapor Transmission of Organic Coating Films
Effective Date
01-Jun-2004
Referred By
ASTM D2370-16(2021) - Standard Test Method for Tensile Properties of Organic Coatings
Effective Date
01-Jun-2004

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ASTM D4708-99(2004) - Standard Practice for Preparation of Uniform Free Films of Organic CoatingsASTM D4708-99(2004) - Standard Practice for Preparation of Uniform Free Films of Organic Coatings
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ASTM D4708-99(2004) - Standard Practice for Preparation of Uniform Free Films of Organic Coatings
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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:D4708–99(Reapproved2004)
Standard Practice for
Preparation of Uniform Free Films of Organic Coatings
This standard is issued under the fixed designation D 4708; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Significance and Use
1.1 This practice covers the preparation of free films of 4.1 Free films are required for conducting tests to evaluate
organic coatings for use in determining the physical properties physicalpropertiessuchastensileandelongation(TestMethod
of the coatings. Procedures are given for preparing free films D 2370), moisture vapor permeability (Test Methods D 1653),
on four alternative substrates. These substrates are dental foil, and other physical properties of organic coatings where the
treated FEP (fluorinated ethylene-propylene) sheet, silicone substrate may interfere with the determination.
coated paper, and halo-silane coated glass plates. 4.2 The tin foil/mercury amalgamation procedure should be
1.2 The values stated in SI units are to be regarded as the used only in cases where other substrates may be affected by
standard. The values given in parentheses are for information high-temperature baking or may affect the test results.
only.
5. Apparatus and Materials
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 5.1 Equipment, for applying films of uniform thickness as
described in Practices D 823.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 5.2 Micrometer Film Thickness Gage, as described in Test
Methods D 1005.
bility of regulatory limitations prior to use. A specific hazard
statement is given in 6.1. 5.3 Alternative Release Substrates:
5.3.1 Dental Tin Foil, preferably 25-µm (1-mil) thick.
2. Referenced Documents
5.3.2 Sheet of FEP—(polyhexafluoropropylene), prefer-
2.1 ASTM Standards: ably 50-µm (2-mils) thick, coated with a thin film of a dry
D 823 Practices for Producing Films of Uniform Thickness lubricant.
of Paint, Varnish, and Related Products on Test Panels 5.3.3 Sheet of Silicone Coated Paper, preferably 125-µm
D 1005 Test Methods for Measurement of Dry-Film Thick- (5-mil) thick.
ness of Organic Coatings Using Micrometers 5.3.4 Glass Plates, coated with halosilane compound.
D 1653 Test Methods for Water Vapor Transmission of
NOTE 1—Other substrates that may be suitable are 250-µm (10-mil)
Organic Coating Films
thick polyethylene, photographic paper, polished steel, and fluoropolymer
D 2370 Test Method for Tensile Properties of Organic
coated metal panels.
Coatings
3. Summary of Test Method
3.1 Free films are prepared by depositing a uniform wet
Teflon FEP 2-mil film thickness (Card No. 03111, Item #29499) from E.I. du
coating of the test material on a release substrate. The applied
Pont de Nemours & Co., Inc., Wilmington, DE 19898, was found suitable for this
films are dried or baked, cut into appropriate size for the purpose.However,itisnolongeravailable.Othersubstratesthatmaybesuitableare
250-µm (10-mil) thick polyethylene, photographic paper, polished steel, and
intended physical property test, and then stripped from the
fluoropolymer coated metal panels.
release substrate.
The sole source of supply of dry lubricant (MS-122 Fluorocarbon Release
Agent) known to the committee at this time is Miller-Stephenson Chemical Co.,
Inc., 55 BackusAve., Danbury, CT 06810. If you are aware of alternative suppliers,
This practice is under the jurisdiction of ASTM Committee D01 on Paint and please provide this information to ASTM International Headquarters. Your com-
Related Coatings, Materials, and Applications and is the direct responsibility of ments will receive careful consideration at a meeting of the responsible technical
Subcommittee D01.23 on Physical Properties of Applied Paint Films. committee, which you may attend.
Current edition approved June 1, 2004. Published June 2004. Originally The sole source of supply of silicone coated release paper, Form RP-1K, size
5 1
approved in 1987. Last previous edition approved in 1999 as D 4708 – 99. 8 ⁄8 by 11 ⁄4 in., known to the committee at this time is the Leneta Co., 15 Whitney
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Rd., Mahwah, NJ 07430. If you are aware of alternative suppliers, please provide
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM this information to ASTM International Headquarters. Your comments will receive
Standards volume information, refer to the standard’s Document Summary page on careful consideration at a meeting of the responsible technical committee, which
the ASTM website. you may attend.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D4708–99 (2004)
5.4 Precision Specimen Cutter, having a double blade with 7.1.1.4 Age or expose the coated foil to conditions mutually
a foot to hold the sample. agreed upon.At the end of the specified or agreed upon period,
remove the foil-backed film from the glass or metal substrate
6. Hazards and cut the specimens to size using a sharp knife or a precision
specimen cutter.
6.1 Mercury—This practice involves the use of an OSHA-
designated hazardous substance, mercury. For information on NOTE 3—To prepare specimens for tensile property tests a precision
specimen cutter must be used to ensure nick-free edges on the specimens.
the potential hazards and guidance relative to use, consult the
Even with this instrument, it is necessary to cut each specimen indepen-
supplier’s Material Safety Data Sheet. Mercury is a toxic
dently, allowing at least 13 mm ( ⁄2 in.) of waste between specimens.
metallic liquid. Its vapors are extremely hazardous. Small
7.1.1.5 Place the foil-backed specimen film side up on a
amounts of spilled mercury ca
...

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SCOPE
1.1 This test method covers the procedure for measurements of internal stresses in organic coatings by using the cantilever (beam) method.  
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