ASTM D3419-00
(Practice)Standard Practice for In-Line Screw-Injection Molding Test Specimens From Thermosetting Compounds
Standard Practice for In-Line Screw-Injection Molding Test Specimens From Thermosetting Compounds
SCOPE
1.1 This practice covers the general principles to be followed when injection molding test specimens of thermosetting materials. It is to be used to obtain uniformity in methods of describing the various steps of the injection molding process and in the reporting of those conditions. The exact molding conditions will vary from material to material, and should become part of the material specification or be agreed upon between the purchaser and the supplier.
Note 1--The utility of this practice has been demonstrated for the molding of thermosetting molding compounds exhibiting lower-viscosity non-Newtonian flow.
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 problems, 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.
1.3 This practice assumes the use of reciprocating screw injection molding machines.
Note 2--This standard is similar in content (but not technically equivalent) to ISO 10724: 1994(E).
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Designation: D 3419 – 00
Standard Practice for
In-Line Screw-Injection Molding Test Specimens From
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Thermosetting Compounds
This standard is issued under the fixed designation D 3419; 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.
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1. Scope * ISO 3167: 1993, Plastics—Multipurpose Test Specimens
1.1 This practice covers the general principles to be fol-
3. Terminology
lowed when injection molding test specimens of thermosetting
3.1 Definitions:
materials. It is to be used to obtain uniformity in methods of
3.1.1 General—Definitions of terms applying to this prac-
describing the various steps of the injection molding process
tice appear in Terminology D 883.
and in the reporting of those conditions. The exact molding
3.1.2 injection molding—the process of forming a material
conditions will vary from material to material, and should
by forcing it, in a fluid state and under pressure, through a
become part of the material specification or be agreed upon
runner system (sprue, runner, and gate(s)) into the cavity of a
between the purchaser and the supplier.
closed mold.
NOTE 1—The utility of this practice has been demonstrated for the
3.1.3 Discussion—Screw-injection molding and reaction-
molding of thermosetting molding compounds exhibiting lower-viscosity
injection molding are types of injection molding.
non-Newtonian flow.
3.2 Definitions of Terms Specific to This Standard:
1.2 The values stated in SI units are to be regarded as the
3.2.1 breathing, v—theoperationofopeningamoldorpress
standard. The values given in parentheses are for information
for a very short period of time at an early stage in the process
only.
of cure.
1.3 This standard does not purport to address all of the
3.2.2 Discussion—Breathing allows the escape of gas or
safety problems, if any, associated with its use. It is the
vapor from the molding material and reduces the tendency of
responsibility of the user of this standard to establish appro-
thick moldings to blister.
priate safety and health practices and determine the applica-
3.2.3 cavity (of a mold), n—the space within a mold to be
bility of regulatory limitations prior to use.
filled to form the molded product.
1.4 This practice assumes the use of reciprocating screw
3.2.4 landing (of a cavity), v—the practice of relieving the
injection molding machines.
mold around the cavity (cavities), thus reducing the surface
area of the flat mating surfaces of the mold halves. Typical
NOTE 2—This standard is similar in content (but not technically
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lands are 4.5 mm ( ⁄16 in.) to 6 mm ( ⁄4 in.) in width. Landing
equivalent) to ISO 10724: 1994(E).
pads should be incorporated to hold the mold open 0.0125 mm
2. Referenced Documents
(0.0005 in.) to prevent damage to the lands.
2.1 ASTM Standards:
2 4. Significance and Use
D 883 Terminology Relating to Plastics
4.1 This practice is subject to the definition of injection
D 958 Practice for Determining Temperatures of Standard
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ASTM Molds for Test Specimens of Plastics molding given in 3.1.2 with the further provision that with
in-line screw injection the plastic compound, heated in a
2.2 ISO Standards:
ISO 10724: 1994(E)—Plastics—Thermosetting Moulding chamber by conduction and friction, is fluxed by the action of
a reciprocating screw and then is forced into a hot mold where
Materials—Injection Moulding of Multipurpose Test
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Specimens it solidifies. Hereafter, in-line screw-injection molding will be
referred to simply as injection molding.
4.2 The mold referenced in this section (Fig. 1) is generally
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This practice is under the jurisdiction ofASTM Committee D20 on Plastics and
useful, and describes what have been the most common
is the direct responsibility of Subcommittee D20.09 on Specimen Preparation.
specimens required for the testing of thermosets. ISO speci-
Current edition approved Nov. 10, 2000. Published February 2001. Originally
mens and testing are gaining favor, however. ISO 10724
published as D 3419 – 75. Last previous edition D 3419 – 93.
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Annual Book of ASTM Standards, Vol 08.01.
describes the layout and practice for injection molding the
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Discontinued 1995. See 1994 Annual Book of ASTM Standards, Vol 08.01.
multi-purpose specimens per ISO 3167.
4 nd th
Available from American National Standards Institute, 11 W. 42 St., 13
Floor, New York, NY 10036.
*A Summary of Changes section appears at the end of this standard.
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D 3419
4.3 Typically, injection-molded
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