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ASTM

ASTM D956-87

(Practice)

Practice for Compression Molding Specimens of Amino Molding Compounds (Withdrawn 1992)

Practice for Compression Molding Specimens of Amino Molding Compounds (Withdrawn 1992)

General Information

Status
Withdrawn
ICS
83.040.10 - Latex and raw rubber
Technical Committee
D20 - Plastics
Drafting Committee
D20.09 - Specimen Preparation
Current Stage
Ref Project

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ASTM D956-87 - Practice for Compression Molding Specimens of Amino Molding Compounds (Withdrawn 1992)ASTM D956-87 - Practice for Compression Molding Specimens of Amino Molding Compounds (Withdrawn 1992)
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ASTM D956-87 - Practice for Compression Molding Specimens of Amino Molding Compounds (Withdrawn 1992)
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Standards Content (Sample)

. _.
Designation: D 956 - 87
..:
AMERICAN SOCIETY FOR TESTING AND MATERIALS
. 1916 Race SI., Philadelphia, Pa. 19103 .
Reprinted from the Annual Book of ASTM Standards, Copyright ASTM
’ If not listed in the current combined index. will appear in !he next edition.
,.
1-
Standard Practice for
COMPRESSION. MOLDING TEST SPECIMENS OF AMINO
-.
MOLDING COMPOUNDS’
. .i
This standard is issued underthe fixed designation D956; 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 supeiscript epsilon (e) indicates an editorial change since the last revision or reapproval.
_- .
1. scope Plastics2
D647 Practice for Design of Molds for Test
1. I This practice covers procedures. for mold-
Specimens of Plastic Molding Matenal?
ing test specimens of impact, flexure, tensile,
D651 Test Method for Tensile Strength of
and water absorption from urea-formaldehyde
Moldd Electí-ical Insulating Materials3
compounds and melamine-formaldehyde com-
D 704 Specification for Melamine-Formal-
pounds.
. dehyde Molding Compounds’
1.1.1 Cellulose-Filled Urea and Melamine.
D 705 Specification for Urea-Formaldehyde
Materials:
Molding Compounds2
Impact test specimens, 12.7 by 12.7 by 127
D958 Practice for Determining Tempera-
mm (I/2 by Y2 by 5 in.) . .
tures of Standard ASTM Molds for Test
Flexural test specimens, 6.4 by 12.7 by 127
Specimens of Plastics’
mm (Y. by Y2 by 5 in.)
Water-absorpiion skimens, 5 1 by 3.2-mm 3.
and use
(2 by %-in.) disk. .
3.1 The conditions under which samples are
1.1.2 Shock-Resistant Melamine Materials:.
Impact test swimens, 12.7 by 12.7 by 127 molded influence the PrOPeflia of the speci-
mens. In determining whether a given compound
mm (Y2 by 1/2 by 5 in.)
flexural test specimens, 6.4 by I 2.7 by 127 meets the specification requirements, it is impor-
* tant to hold to a standard set of conditions. This
mm (% by Y2 by 5 in.)
is &O iìKeSSâiY for a valid COmpXkOn Of Prop
Tension test specimens, “dog-hne”
ehes obtained with different Compounds, Or be-
mens shown in Fig. 2 ofASTM Method D 65 1,
tween different batches Of the same compound.
Test for Tensile Strength of Molded ~lectri~l
3.2 If the molded specimens show evidence of
Insulating Materials?
low density ara due to trapped gaseSv the SpeC-
1.2 The values stated in SI units are to be
hens should be discarded. A breathe step should
regarded as the standard. The values in parenthe-
be used in molding new specimens. It is critical
ses are given for information only.
to hold to a relatively brief breathe cycle to avoid
1.3 This srandard may inmlve hazardous ma-
Prmudng the granules before PressUre is ap
terials, operations, and equipment. This standard
Piid- That in poorly knitted areas-
does not purport to address all of the safity prob-
and lower strength in the molded spimen-
lems associated with its use. It is the responsibil-
ity of the user of this standard to establish appro-
.
priate safity and health practices and determine
the applicability of regulatory limitations prior to
This piactice is under the jurisdiction of ASTM Committee
*
D-20 on Plastics and is the dimt responsibility of Subcommittee
use.
D20.09 on Specimen Preparations.
Current edition approved Sept. 25.1987. PuMished Novcm-
2. Referend Documents
ber 1987. Or¡g¡nally published as D 956 - 48 T. Last pmiou~
edition D956 - 51 (1981).
2.1 ASTM Standards:
Annual Bodc of ASTM Sfandards, Vol 08.0 I.
D638 Test Method for Tensile Properties of
’Annual Ed ofASTM Slandards. vol 10.01.
-.

---------------------- Page: 1 ----------------------
ASTM D9Cb 87 W 0759530 00L!0397 O
-
D 956
-~
semi-automatic by bolting them to the press platens:
4. Apparatus
NOTE 2-Chrome plating of cavities is recom-
4.1 Molds (Nofe 1):
mended, but not necessary.
4.1.1 For molding impact specimens of cellu-
4.2 Press-A hydraulic press of suficient sen-
lose-filled urea and melamine materials, a single
sitivity so that the molding pressure on the spec-
bar, single cavity positive mold such as that
imen can be controlled to f 1.7 MPa (k250 psi).
shown in the figure illustrating the Single Bar,
4.3 Heatirtg Sysfem-Any convenient
Single Cavity Positive Mold in Practice D647
method of heating the press platens or molds
shall be used. . .
may be used, provided the.sÓurce of heat is
4.1.2 For molding impact and flexure test
constant enough to maintain the mold tempera-
specimens of shock-resistant urea and mela-
ture within I3"C (5°F).
mine materials, a single bar, single cavity positive
4.4 Mold Temperature-Either 3, thermome-
mold such as that shown in the figure illustrating
or pyrometer, as specified in Practice D 958,
ter
the Single Bar, Single Cavity Positive Mold in
-may be used to obtain the mold temperature.
D647 shall be used.
Practice
4.1.3
...

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