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ASTM D4703-93

(Practice)

Standard Practice for Compression Molding Thermoplastic Materials into Test Specimens, Plaques, or Sheets

Standard Practice for Compression Molding Thermoplastic Materials into Test Specimens, Plaques, or Sheets

SCOPE
1.1 This practice covers the compression molding of thermoplastic granules and milled stock for the preparation of test specimens.
1.2 While conditions for certain materials are given, the primary source of specific conditions shall be the material specification standards for each type of material.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 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--The main body of this practice is equivalent to ISO 293-1986. Annex A1 and ISO 293-1986 differ in some details; however, specimens prepared using Annex A1, Procedure A should be equivalent to those prepared using ISO 293-1986, Cooling Method D. Specimens prepared using Annex A1, Procedure C should be equivalent to those prepared using ISO 293-1986, Cooling Method B. However, due to the greater cooling rate tolerances of the ISO standard, specimens prepared according to ISO Cooling Method B may not be equivalent to Annex A1, Procedure C.

General Information

Status
Historical
Publication Date
09-Dec-2000
ICS
83.080.20 - Thermoplastic materials
Technical Committee
D20 - Plastics
Drafting Committee
D20.09 - Specimen Preparation
Current Stage
Ref Project

Relations

Replaced By
ASTM D4703-00 - Standard Practice for Compression Molding Thermoplastic Materials into Test Specimens, Plaques, or Sheets
Effective Date
10-Dec-2000
Referred By
ASTM D955-21 - Standard Test Method of Measuring Shrinkage from Mold Dimensions of Thermoplastics
Effective Date
10-Dec-2000
Referred By
ASTM D3350-21 - Standard Specification for Polyethylene Plastics Pipe and Fittings Materials
Effective Date
10-Dec-2000
Referred By
ASTM D2839-16(2023) - Standard Practice for Use of a Melt Index Strand for Determining Density of Polyethylene
Effective Date
10-Dec-2000
Referred By
ASTM D883-22 - Standard Terminology Relating to Plastics
Effective Date
10-Dec-2000
Referred By
ASTM D8117-21 - Standard Test Method for Oxidative Induction Time of Polyolefin Geosynthetics by Differential Scanning Calorimetry
Effective Date
10-Dec-2000
Referred By
ASTM D1693-21 - Standard Test Method for Environmental Stress-Cracking of Ethylene Plastics
Effective Date
10-Dec-2000
Referred By
ASTM D3004-08(2020) - Standard Specification for Crosslinked and Thermoplastic Extruded Semi-Conducting, Conductor, and Insulation Shielding Materials
Effective Date
10-Dec-2000
Referred By
ASTM D1998-21 - Standard Specification for Polyethylene Upright Storage Tanks
Effective Date
10-Dec-2000
Referred By
ASTM D3981-09a(2016) - Standard Specification for Polyethylene Films Made from Medium-Density Polyethylene for General Use and Packaging Applications
Effective Date
10-Dec-2000
Referred By
ASTM D4883-18 - Standard Test Method for Density of Polyethylene by the Ultrasound Technique
Effective Date
10-Dec-2000
Referred By
ASTM D1784-20 - Standard Classification System and Basis for Specification for Rigid Poly(Vinyl Chloride) (PVC) Compounds and Chlorinated Poly(Vinyl Chloride) (CPVC) Compounds
Effective Date
10-Dec-2000
Referred By
ASTM D1248-16 - Standard Specification for Polyethylene Plastics Extrusion Materials for Wire and Cable
Effective Date
10-Dec-2000
Referred By
ASTM F2922-13(2018) - Standard Specification for Polyethylene (PE) Corrugated Wall Stormwater Collection Chambers
Effective Date
10-Dec-2000
Referred By
ASTM D1505-18 - Standard Test Method for Density of Plastics by the Density-Gradient Technique
Effective Date
10-Dec-2000

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ASTM D4703-93 - Standard Practice for Compression Molding Thermoplastic Materials into Test Specimens, Plaques, or SheetsASTM D4703-93 - Standard Practice for Compression Molding Thermoplastic Materials into Test Specimens, Plaques, or Sheets
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ASTM D4703-93 - Standard Practice for Compression Molding Thermoplastic Materials into Test Specimens, Plaques, or Sheets
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 4703 – 93 An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Practice for
Compression Molding Thermoplastic Materials into Test
1
Specimens, Plaques, or Sheets
This standard is issued under the fixed designation D 4703; 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.
1. Scope measured in the nearest vicinity to the molded material.
3.1.3.1 Discussion—For positive molds, holes are normally
1.1 This practice covers the compression molding of ther-
drilled in the mold for measuring the temperatures defined in
moplastic granules and milled stock for the preparation of test
2 3.1.3 and 3.1.4.
specimens.
3.1.4 molding temperature, n—the temperature of the mold
1.2 Certain ASTM standards require the use of Test Method
or the press platens during the preheating and molding time,
D 1928 for compression molding of polyethylene test speci-
measured in the nearest vicinity to the molded material.
mens. Determine whether such requirements exist before using
3.1.5 molding time, n—the time during which full pressure
this practice.
is applied while maintaining the molding temperature.
1.3 While conditions for certain materials are given, the
3.1.6 preheating time, n—the time required to heat the
primary source of specific conditions shall be the material
material in the mold up to the molding temperature while
specification standards for each type of material.
maintaining the contact pressure.
1.4 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
4. Significance and Use
only.
4.1 The methods by which sample materials are prepared
1.5 This standard does not purport to address all of the
and molded influence the mechanical properties of the speci-
safety problems, if any, associated with its use. It is the
men. Unlike injection molding, the objective of compression
responsibility of the user of this standard to establish appro-
molding is to produce test specimens or sheets that are both
priate safety and health practices and determine the applica-
homogeneous and isotropic. Molded specimens may be made
bility of regulatory limitations prior to use.
either from pellets such as are received directly from a material
2. Referenced Documents manufacturer, particles produced in a recycle recovery opera-
tion, or from a milled preform or sheet prepared on a two-roll
2.1 ASTM Standards:
mill. The pellets, particles, preform, or sheet are melted and
D 1928 Test Method for Preparation of Compression-
3 molded in a mold designed to produce a finished specimen of
Molded Polyethylene Test Sheets and Test Specimens
a given geometry, size, and thickness, or melted and molded in
3. Terminology the form of a smooth plaque or sheet of uniform thickness from
which desired specimens are cut, punched, or machined.
3.1 Definitions of Terms Specific to This Standard:
Working a compound on a two-roll mill prior to molding will
3.1.1 average cooling rate (°C/min), n—the cooling rate
disperse and distribute the compound additives in a manner
calculated by dividing the difference between the molding and
that will affect the physical properties of the compound. The
demolding temperatures by the time required to cool the mold
need for milling a sample prior to compression molding may be
to the demolding temperature.
determined by reference to the relevant material specification
3.1.2 cooling rate (°C/h), n—the rate of cooling obtained by
or the material manufacturer. It is important to treat different
controlling the flow of the cooling fluid in such a way that
samples of the same type of material in the same way: if
during each 10-min interval, the deviation from this specified
milling was done prior to molding on a material which is to be
cooling rate shall not exceed the specified tolerance.
used as a standard for comparison, all new materials to be
3.1.3 demolding temperature, n—the temperature of the
tested against this practice should be prepared and molded in a
mold or the press platens at the end of the cooling time,
similar manner.
4.2 The apparatus and exact conditions required to prepare
1
This practice is under the jurisdiction of ASTM Committee D-20 on Plastics
adequate specimens may vary for each plastic material. Appa-
and is the direct responsibility of Subcommittee D20.09 on Specimen Preparation.
ratus and procedures which should be satisfactory for molding
Current edition approved Feb. 15, 1993. Published April
...

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1.1 This test method covers the quantitative determination of the volatile matter (including water) present in vinyl chloride resins.  
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