ASTM D2730-80

Method for Sag Flow of Highly Viscous Materials (Withdrawn 1986)

General Information

• Status: Withdrawn
• ICS: 83.180 - Adhesives
• Technical Committee: D20 - Plastics

Standards Content (Sample)

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9 900927b 0027341 5bT M
ANSI/ASTM D 2730 - 80
4Clt
AMERICAN SOCIETY FOR TESTING AND MATERIALS
1916 Race St., Philadelphia, Pa. 19103
Reprinted from the Annual Book of ASTM Standards, Copyright ASTM
If not listed in the current combined index, will appear in the next edition.
Standard Test Method for
SAG FLOW OF HIGHLY VISCOUS RESINS'
This standard is issued under the fixed designation D 2730 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.
1. scope
conforming to the requirements as prescribed
E 1.
in Specification
1.1 This method2 covers the determination
4.4 Splining Tool or other straightedge.
of the flow properties of highly viscous mate-
4.5 Timer.
rials and pastes. The test procedure is applica-
4.6 Mold Release Agent.
ble to mixed and curing systems, as well as to
NOTE I-In establishing standards and in com-
individual resin and hardener components.
parative testing, it is essential that a single mold
Testing of low-viscosity materials by this pro-
release agent be used and properly applied.s
cedure is generally not practical. Low viscosity
materials should be tested in accordance with
5. Conditioning
Method D 2393.
5.1 Cover the sample and place it in a tem-
1.2 The values stated in SI units are to be
perature-controlled bath at the test temperature
regarded as the standard.
for at least 4 h prior to testing, or for however
much longer time is needed for all parts of the
2. Applicable Documents
sample to reach the test temperature within
2. I ASTM Standards:
O. 1°C (0.2"F).
D2393 Test for Viscosity of Epoxy Resins
NOTE 2-If the sample is a reacting mixture, such
and Related Components3
as a mixture of a paste resin with a hardener, bring
the resin component and the hardener component to
D2471 Test for Gel Time and Peak Exo-
the test temperature separately befoie mixing.
thermic Temperature of Reacting Ther-
5.2 Periods of conditioning shorter than 4 h
mosetting Resins"
may be used, if experience has shown sag flow
E 1 Specification for ASTM Thermometers4
results to be comparable to those obtained after
3. Significance
4 h conditioning. If the sample is conditioned
less than 4 h, the time of conditioning must be
3.1 The procedure described can be used as
shown in the report.
a quality control and acceptance test for highly
viscous materials and pastes. The method de-
6. Procedure
termines the maximum thickness to which a
6.1 Condition the sag flow board (Fig. i) for
material can be applied without sagging. It also
provides a means of measuring the amount of
' This method is under the jurisdiciion of ASTM Com-
sag flow at a given thickness.
mittee D-20 on Plastics and is the direct responsibility of
Subcommittee D20.16 on Thermosetting Materials.
4. Apparatus
Current edition approved March 3, 1980. Published May
1980. Originally published as D 2730 - 68. Last previous
4,l Sag Flow Board, as pictured in Fig. 1.
edition D 2730 - 68 (1979).
4.2 Temperature-Controlled Bath, controlla-
' Another procedure for sag flow measurement is incor-
porated in MIL-S-8802D. This procedure involves use of
ble to O. 1 "C (0.2"F), either oil or water type.
special apparatus.
4.3 Thermometer, Celsius, with O. I "C divi-
"Annual Book ofASTM Standards, Part 36.
sions, or Fahrenheit, with 0.2"F divisions. A
Annual Book of ASTM Siandards, Parts 25 and 44.
' A satisfactory mold release agent that was used in inter-
suitable thermometer is ASTM Thermometer
laboratory testing is Chem-Trend Monocoat, available from
9 I OC, 20 to 50°C range, with 0. 1 "C divisions,
Chem-Trend, Inc. 3205 E. Grand River Ave., Howell, Mich.
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m 9009276 0027342 4Tb m
D 2730 *
at least 4 h at the test temperature (normally 15 min, the filling of a channel must not continue
into the last 5 min before gelation occurs, because the
25°C (77’F)).
exothermic reaction may affect the sag flow test.
6.2 Apply mold release agent to the sag flow
board and polish it to a glossy finish. 6.6 At the end of the test (30 min unless
6.3 Mix the components of the sample in otherwise reported), measure in millimeters (or
inches to the nearest 0.1 in.) the distance from
accordance with the manufacturer’s instruc-
tions. For channels 4, 5, and 6 (see Fig. i), mix the lower end of the guides to the point of
maximum flow for each thickness of interest. if
at one time only enough material to fill a single
to avoid undue effect of temperature the lowest point is not in contact with the
channel,
rise on the sag flow. Pastes or high viscosity surface of the board, measure the horizontal
materials should be mixed on a flat plate with projection of the lowest point on the plane of
a putty knife or spatula. Materials of greater the board.
...