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ASTM D3532-99(2009)

(Test Method)

Standard Test Method for Gel Time of Carbon Fiber-Epoxy Prepreg

Standard Test Method for Gel Time of Carbon Fiber-Epoxy Prepreg

SIGNIFICANCE AND USE
This test method can be used to obtain the gel time of resin squeezed from prepreg tape or sheet material. This test is a useful measure for material acceptance.
The gel time will vary with the test temperature. The temperatures specified in this test method are two of many temperatures often used in processing epoxy prepreg material. If other test temperatures are used, this is to be clearly noted as indicated in 9.1.2.  
Gel time is not recommended as a measure of outline (unacceptable degree of cross-linking). Use Resin Flow Test Method D3532, or Dynamic Viscosity Practice D4473.
SCOPE
1.1 This test method covers the determination of gel time of carbon fiber-epoxy tape and sheet. The test method is suitable for the measurement of gel time of resin systems having either high or low viscosity.  
1.2 The values stated in SI units are to be regarded as standard. The values in parentheses are for reference 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.

General Information

Status
Historical
Publication Date
31-Aug-2009
ICS
83.120 - Reinforced plastics
Technical Committee
D30 - Composite Materials
Drafting Committee
D30.03 - Constituent/Precursor Properties
Current Stage
Ref Project

Relations

Replaces
ASTM D3532-99(2004) - Standard Test Method for Gel Time of Carbon Fiber-Epoxy Prepreg
Effective Date
01-Sep-2009
Replaced By
ASTM D3532/D3532M-12 - Standard Test Method for Gel Time of Carbon Fiber-Epoxy Prepreg
Effective Date
01-May-2012

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ASTM D3532-99(2009) - Standard Test Method for Gel Time of Carbon Fiber-Epoxy Prepreg
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D3532–99 (Reapproved 2009)
Standard Test Method for
Gel Time of Carbon Fiber-Epoxy Prepreg
This standard is issued under the fixed designation D3532; 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.
1. Scope 4. Apparatus
1.1 This test method covers the determination of gel time of 4.1 Cutting Knife.
carbon fiber-epoxy tape and sheet. The test method is suitable 4.2 HotPlate,capableofmaintainingtemperaturesofeither
for the measurement of gel time of resin systems having either 120°C (250°F) or 175°C (350°F) and the means of measuring
high or low viscosity. its surface temperature to an accuracy of 61°C (62°F).
1.2 The values stated in SI units are to be regarded as 4.3 Stopwatch or Suitable Timer, capable of reading 1-s
standard. The values in parentheses are for reference only. intervals up to 60 min.
1.3 This standard does not purport to address all of the 4.4 Microscope Coverglasses, 18 to 22 mm (0.7 to 0.9 in.)
safety concerns, if any, associated with its use. It is the in diameter.
responsibility of the user of this standard to establish appro- 4.5 Wooden Probe, small, such as a toothpick, mounted in a
priate safety and health practices and determine the applica- drafting pencil holder or fine glass rod.Alow thermal capacity
bility of regulatory limitations prior to use. is needed.
2. Summary of Test Method 5. Interferences
2.1 A specimen of prepreg material approximately 5 mm 5.1 The test is a subjective measure of when a gel point is
(0.25 in.) square is placed between microscope cover glasses reached. The visual evidence of gel may vary between mate-
on a hot plate preheated to either of two test temperatures, 120 rials, reinforcements, and, in some cases, between resin mate-
or 175°C (250 or 350°F). Pressure is applied to the specimen rial batches. If the definition of gel in this method is not
throughthecoverglasswithawoodpicktoformabeadofresin sufficiently standard for a given material, interested parties
at the edge of the cover glass.The time from the application of shall agree on a further definition of gelation.
heat until the resin ceases to form strings by contact with the
6. Test Specimen
pick is noted and reported as the gel time.
6.1 A minimum of three specimens shall be tested for each
3. Significance and Use
sample.
3.1 This test method can be used to obtain the gel time of 6.2 The test specimen shall consist of prepreg material cut
resin squeezed from prepreg tape or sheet material. This test is to approximately 6-mm (0.25-in.) square.
a useful measure for material acceptance.
7. Conditioning
3.2 The gel time will vary with the test temperature. The
temperatures specified in this test method are two of many 7.1 Store carbon fiber-epoxy prepreg tape at low tempera-
tures, approximately−18°C (0°F), to prolong the usefulness of
temperatures often used in processing epoxy prepreg material.
If other test temperatures are used, this is to be clearly noted as the material.Allow the sealed packages of material to warm to
ambienttemperaturebeforethesealisopenedtoensurethatthe
indicated in 9.1.2.
3.3 Gel time is not recommended as a measure of outline material does not absorb moisture from the atmosphere.
(unacceptable degre
...

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SCOPE
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5.1 Refer to Guide D8509.
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