ASTM D3123-09
(Test Method)Standard Test Method for Spiral Flow of Low-Pressure Thermosetting Molding Compounds
Standard Test Method for Spiral Flow of Low-Pressure Thermosetting Molding Compounds
SIGNIFICANCE AND USE
The spiral flow of a thermosetting molding compound is a measure of the combined characteristics of fusion under pressure, melt viscosity, and gelation rate under specific conditions.
This test method is useful as a quality control test and as an acceptance criterion.
This test method, by itself, is not a valid means for comparing the moldability of similar or different molding compounds because it cannot duplicate actual conditions prevalent in different types of production molds.
This test method is presently intended for use at a transfer pressure of 6.9 MPa (1000 psi) and a mold temperature of 423 ± 3 K (150 ± 3°C (302 ± 5°F)).
SCOPE
1.1 This test method covers a procedure for measuring the spiral flow of thermosetting molding compounds (soft or very soft) designed for molding pressures under 6.9 MPa (1000 psi). It is especially suited for those compounds used for encapsulation or other low pressure molding techniques. It involves the use of a standard spiral flow mold in a transfer molding press under specified conditions of applied temperature and pressure with a controlled charge mass.
1.2 The values stated in SI units are to be regarded as standard.
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.
Note 1—There is no known ISO equivalent to this test method.
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Designation: D3123 − 09
Standard Test Method for
Spiral Flow of Low-Pressure Thermosetting Molding
1
Compounds
This standard is issued under the fixed designation D3123; 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. Significance and Use
1.1 This test method covers a procedure for measuring the 4.1 The spiral flow of a thermosetting molding compound is
spiral flow of thermosetting molding compounds (soft or very a measure of the combined characteristics of fusion under
soft)designedformoldingpressuresunder6.9MPa(1000psi). pressure, melt viscosity, and gelation rate under specific
It is especially suited for those compounds used for encapsu- conditions.
lation or other low pressure molding techniques. It involves the
4.2 This test method is useful as a quality control test and as
use of a standard spiral flow mold in a transfer molding press
an acceptance criterion.
under specified conditions of applied temperature and pressure
4.3 This test method, by itself, is not a valid means for
with a controlled charge mass.
comparing the moldability of similar or different molding
1.2 The values stated in SI units are to be regarded as
compounds because it cannot duplicate actual conditions
standard.
prevalent in different types of production molds.
1.3 This standard does not purport to address all of the
4.4 This test method is presently intended for use at a
safety concerns, if any, associated with its use. It is the
transferpressureof6.9MPa(1000psi)andamoldtemperature
responsibility of the user of this standard to establish appro-
of 423 6 3 K (150 6 3°C (302 6 5°F)).
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5. Apparatus
NOTE 1—There is no known ISO equivalent to this test method. 5.1 Transfer Molding Press with a minimum 150 by
150-mm (6 by 6-in.) platen area, transfer piston pressure
2. Referenced Documents
potentially greater than 6.9 MPa (1000 psi), sufficient clamp
2
pressure to prevent flashing, and a minimum plunger speed of
2.1 ASTM Standards:
25.4 mm (1 in.)/s without load. It is recommended that the
D883 Terminology Relating to Plastics
plunger be equipped with at least one peripheral sealing
D958 Practice for Determining Temperatures of Standard
groove. It is recommended that a pot diameter between 31.75
ASTM Molds for Test Specimens of Plastics (Withdrawn
3
and 44.45 mm (1.25 and 1.75 in.) be used whenever a choice
1995)
is possible.
E105 Practice for Probability Sampling of Materials
NOTE2—Preliminaryevidenceindicatesthat,inmanycases,reasonable
3. Terminology
correlations may be achieved between laboratories using presses with
differentpotdiameters.Typicalexamplesarepresseswithpotdiametersof
3.1 Definitions—Definitions in this test method are consis-
31.750, 38.100, and 44.450 mm (1.250, 1.500, and 1.750 in.). However, a
tent with Terminology D883.
few well-documented cases are recorded where differences in pot
diameters, even within this listed range, have caused large differences in
flow-length readings. Therefore, for best interlaboratory correlation it is
recommended that identical pot diameters be used.
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
5.2 Standard Spiral-Flow Mold shown in Fig. 1 shall be
and is the direct responsibility of Subcommittee D20.30 on Thermal Properties
(Section D20.30.08).
utilized.
Current edition approved Sept. 1, 2009. Published September 2009. Originally
approved in 1972. Last previous edition approved in 2004 as D3123 - 98(2004).
6. Materials
DOI: 10.1520/D3123-09.
2
6.1 Molding Compound:
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.1.1 Any thermosetting molding compound with a spiral
Standards volume information, refer to the standard’s Document Summary page on
flow between 762 and 1270 mm (30 and 50 in.) as determined
the ASTM website.
3
at the standard temperature and pressure of this test can be
The last approved version of this historical standard is referenced on
www.astm.org. evaluated.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D3123 − 09
FIG. 1 Standard Spiral-Flow Mold
NOTE 3—Since the only commercially available molds are calibrated in
has been opened.Alternative methods of conditioning samples
inches, spiral-flow length will be reported in these u
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D3123–98 (Reapproved 2004) Designation: D 3123 – 09
Standard Test Method for
Spiral Flow of Low-Pressure Thermosetting Molding
1
Compounds
This standard is issued under the fixed designation D 3123; 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*
1.1 This test method covers a procedure for measuring the spiral flow of thermosetting molding compounds (soft or very soft)
designed for molding pressures under 6.9 MPa [1000 psi].(1000 psi). It is especially suited for those compounds that may be used
for encapsulation or other low pressure molding techniques. Textile-reinforced compounds should not be tested using this test
method. It involves the use of a standard spiral flow mold in a transfer molding press under specified conditions of applied
temperature and pressure with a controlled charge mass.
1.2 The values stated in SI units are to be regarded as standard.
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.
NOTE1—There is no equivalent ISO standard. 1—There is no known ISO equivalent to this test method.
2. Referenced Documents
2
2.1 ASTM Standards:
D 883 Terminology Relating to Plastics
3
D 958 Practice for Determining Temperatures of Standard ASTM Molds for Test Specimens of Plastics
E 105 Practice for Probability Sampling ofOf Materials
3. Terminology
3.1 Definitions —Definitions in this test method are consistent with Terminology D 883.
4. Significance and Use
4.1 The spiral flow of a thermosetting molding compound is a measure of the combined characteristics of fusion under pressure,
melt viscosity, and gelation rate under specific conditions.
4.2 This test method is useful as a quality control test and as an acceptance criterion.
4.3 This test method, by itself, is not a valid means for comparing the moldability of similar or different molding compounds
because it cannot duplicate actual conditions prevalent in different types of production molds.
4.4 This test method is presently intended for use at a transfer pressure of 6.9 MPa [1000 psi](1000 psi) and a mold temperature
of 423 6 3 K (150 6 3°C [302(302 6 5°F]). 5°F)).
5. Apparatus
5.1 Transfer Molding Press withaminimum150by150-mm[6(6by6-in.]6-in.)platenarea,transferpistonpressurepotentially
greater than 6.9 MPa [1000 psi],(1000 psi), sufficient clamp pressure to prevent flashing, and a minimum plunger speed of 25.4
mm [1 in.]/s(1 in.)/s without load. The plunger should It is recommended that the plunger be equipped with at least one peripheral
sealing groove. It is recommended that a pot diameter between 31.75 and 44.45 mm [1.25(1.25 and 1.75 in.]in.) be used whenever
a choice is possible.
NOTE 2—Preliminary evidence indicates that, in many cases, reasonable correlations may be achieved between laboratories using presses with different
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.30 on Thermal Properties (Section
D20.30.08).
´1
Current edition approved October 1, 2004. Published December 2004. Originally approved in 1972. Last previous edition approved in 1999 as D3123-98(99) .
Current edition approved Sept. 1, 2009. Published September 2009. Originally approved in 1972. Last previous edition approved in 2004 as D 3123 - 98(2004).
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Withdrawn.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D3123–09
pot diameters. Typical examples are presses with pot diameters of 31.750, 38.100, and 44.450 mm [1.250,(1.250, 1.500, and 1.750 in.].in.). However, a
few well-documented cases are recorded where differences in pot diameters, even within this listed range, have caused large differences in flow-length
readings
...
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