ASTM D4400-99(2012)
(Test Method)Standard Test Method for Sag Resistance of Paints Using a Multinotch Applicator
Standard Test Method for Sag Resistance of Paints Using a Multinotch Applicator
SIGNIFICANCE AND USE
Evaluation of sag resistance is essential in quality control for both producers and purchasers of coatings. Practical application tests are poor in reproducibility, while viscometric methods, for example Test Methods D2196, are time-consuming and lack the convincing aspect of actual sagging. This method provides simple and rapid tests, whereby sag resistance is demonstrated by a visible sag pattern, and is rated objectively in terms of numerical values that correlate with brushout test observations.
SCOPE
1.1 This test method covers the laboratory determination of the sag resistance of aqueous and nonaqueous liquid coatings at any level of sag resistance.
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.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D4400 − 99 (Reapproved2012)
Standard Test Method for
Sag Resistance of Paints Using a Multinotch Applicator
This standard is issued under the fixed designation D4400; 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.
This standard has been approved for use by agencies of the Department of Defense.
INTRODUCTION
The multinotch applicator used in this test method is a drawdown blade with a series of notches of
successively higher clearance, referred to as the Anti-Sag Meter. See Fig. 1 and Fig. 2 for a
representative diagram and photograph. The numerical value for sag resistance obtained with this
instrument is referred to as the Anti-Sag Index.
Anti-Sag Meters are made with several clearance ranges for different types of coatings (see 5.1 and
Table 1). In developing this standard the task group used an instrument with a range from 4 to 24 mils,
but the method is applicable to any clearance range, and results using instruments with overlapping
ranges correlate and have equal validity.
The basic method was developed in 1962 and is referenced in U.S. Federal specifications
TT-E-508, TT-E-506, and TT-P-1511.
Apreshear program is essential for a drawdown sag test to duplicate the breakdown in structure that
occurs when thixotropic paints are applied by brushout or other practical application methods. The
procedures therefore include the preshearing of paints just prior to making test applications.
1. Scope 2. Referenced Documents
1.1 This test method covers the laboratory determination of 2.1 ASTM Standards:
thesagresistanceofaqueousandnonaqueousliquidcoatingsat D2196 Test Methods for Rheological Properties of Non-
any level of sag resistance. Newtonian Materials by Rotational (Brookfield type)
Viscometer
1.2 The values stated in SI units are to be regarded as the
2.2 U.S. Federal Specifications:
standard. The values given in parentheses are for information
Fed. Spec. TT-E-508 Alkyd semi-gloss enamel
only.
Fed. Spec. TT-E-506 Alkyd gloss enamel
1.3 This standard does not purport to address all of the
Fed. Spec. TT-P-1511 Interior latex gloss and semi-gloss
safety concerns, if any, associated with its use. It is the
finishes
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
3. Summary of Test Method
bility of regulatory limitations prior to use.
3.1 After preshearing, the coating is applied to a test chart
with a multinotch applicator. The charts are immediately hung
vertically with the drawdown stripes horizontal, similar to
rungs of a ladder, with the thinnest stripe at the top. After
dryinginthisposition,thedrawdownisexaminedandratedfor
sagging. A typical sag pattern obtained by this procedure is
shown in Fig. 3.
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Subcommittee D01.42 on Architectural Coatings. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved May 15, 2012. Published May 2012. Originally Standards volume information, refer to the standard’s Document Summary page on
approved in 1984. Last previous edition approved in 2007 as D4400 – 99 (2007). the ASTM website.
DOI: 10.1520/D4400-99R11. Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
“Design of an Improved Sag Tester,” Offıcial Digest, Vol 34, No. 453, October Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
1962. www.dodssp.daps.mil.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D4400 − 99 (Reapproved2012)
4. Significance and Use
4.1 Evaluation of sag resistance is essential in quality
controlforbothproducersandpurchasersofcoatings.Practical
application tests are poor in reproducibility, while viscometric
D4400 − 99 (2012)
FIG. 1 Diagram of the Medium Range Anti-Sag Meter
5.3 Glass Drawdown Plate, plus straightedge guide for
attachment thereto.
5.4 Catch-papers, thin sheets of sealed paper, for catching
surplus paint at the completion of a drawdown.
5.5 Equipment for the Preshearing of Aqueous Coatings:
5.5.1 Syringe, 10-mL, disposable plastic type.
5.5.2 Syringe Needle,15gby40mm(1 ⁄2 in.) to fit syringe.
FIG. 2 Medium Range Anti-Sag Meter
5.5.3 Syringe Extension Tubing, clear vinyl, inside diameter
1 3
3.2 mm ( ⁄8 in.), outside diameter 5 mm ( ⁄6 in.).
methods, for example Test Methods D2196, are time-
5.6 Equipment for the Preshearing of Nonaqueous Coat-
consuming and lack the convincing aspect of actual sagging.
ings:
This method provides simple and rapid tests, whereby sag
5.6.1 Rotary Mechanical Stirrer, variable speed.
resistance is demonstrated by a visible sag pattern, and is rated
5.6.2 Circular Mixing Paddle, diameter approximately 48
objectively in terms of numerical values that correlate with
mm (1 ⁄8 in.).
brushout test observations.
5.6.3 Mixing Container, cylindrical jar or can with capacity
of up to 500 mL (1 pt).
5. Apparatus
5.1 Multinotch Applicator, Anti-Sag Meter , a drawdown
6. Procedure
blade with a series of notches of successively higher clearance.
Select a clearance range suitable for the type of coating under
6.1 Preparation of Sample:
test in accordance with Table 1.
6.1.1 Stirthoroughlywithaspatulaintheoriginalcontainer.
6.1.2 Strain if necessary to remove large particles or skins.
5.2 Test Surfaces, sealed, smooth-surfaced paper test charts,
6.1.3 Adjust the temperature of the coating to 23 6 2°C
with sizes and designs as follows:
(73.5 6 3.5°F).
5.2.1 Black and White Charts, about 193 by 288 mm (7 ⁄8
3 1
by 11 ⁄8 in.), the black area comprising about 140 mm (5 ⁄2 in.)
6.2 Preshearing with Syringe and Needle (Aqueous Coat-
centered on the drawdown path.Achart of this design is shown
ings):
in Figs. 3 and 4.
6.2.1 Prepare the paint as described in 6.1.
5.2.2 Plain White Charts, about 193 by 285 mm (7 ⁄8 by
6.2.2 Cut a 60-mm (2 ⁄2-in.) length of syringe extension
11 ⁄4 in.).
tubing and attach it to the syringe.
6.2.3 Press the syringe barrel firmly to expel air, dip the end
The sole source of supply of the anti-sag meter known to the committee at this
of the syringe into the coating, pump slightly to expel remain-
time is The Leneta Co., 15 Whitney Rd., Mahwah, NJ 07430. If you are aware of
ing air, then withdraw 8 mL of coating.
alternative suppliers, please provide this information to ASTM International
6.2.4 Remove and discard the extension tubing and then
Headquarters.Your comments will receive careful consideration at a meeting of the
responsible technical committee, which you may attend. attach a syringe needle.
D4400 − 99 (2012)
TABLE 1 Anti-Sag Meters—Available Ranges
A
Range For Coating Type: Notch Clearances
ASM-1 Standard Solvent-borne architectural Mils 3456
...
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