ASTM D4703-02

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-Nov-2002
• ICS: 83.080.20 - Thermoplastic materials
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.09 - Specimen Preparation

Relations

• Replaces: ASTM D4703-00 - Standard Practice for Compression Molding Thermoplastic Materials into Test Specimens, Plaques, or Sheets
• Effective Date: 10-Nov-2002
• Replaced By: ASTM D4703-03 - Standard Practice for Compression Molding Thermoplastic Materials into Test Specimens, Plaques, or Sheets
• Effective Date: 10-Jul-2003
• Referred By: ASTM F3181-16(2023) - Standard Test Method for The Un-notched, Constant Ligament Stress Crack Test (UCLS) for HDPE Materials Containing Post- Consumer Recycled HDPE
• Effective Date: 10-Nov-2002
• 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-Nov-2002
• Referred By: ASTM D1248-16 - Standard Specification for Polyethylene Plastics Extrusion Materials for Wire and Cable
• Effective Date: 10-Nov-2002
• Referred By: ASTM D4020-18 - Standard Specification for Ultra-High-Molecular-Weight Polyethylene Molding and Extrusion Materials
• Effective Date: 10-Nov-2002
• Referred By: ASTM D3004-08(2020) - Standard Specification for Crosslinked and Thermoplastic Extruded Semi-Conducting, Conductor, and Insulation Shielding Materials
• Effective Date: 10-Nov-2002
• Referred By: ASTM D4635-16 - Standard Specification for Plastic Films Made from Low-Density Polyethylene and Linear Low-Density Polyethylene for General Use and Packaging Applications
• Effective Date: 10-Nov-2002
• Referred By: ASTM D5885/D5885M-20 - Standard Test Method for Oxidative Induction Time of Polyolefin Geosynthetics by High-Pressure Differential Scanning Calorimetry
• Effective Date: 10-Nov-2002
• Referred By: ASTM F2617-15 - Standard Test Method for Identification and Quantification of Chromium, Bromine, Cadmium, Mercury, and Lead in Polymeric Material Using Energy Dispersive X-ray Spectrometry
• Effective Date: 10-Nov-2002
• Referred By: ASTM D6247-18 - Standard Test Method for Determination of Elemental Content of Polyolefins by Wavelength Dispersive X-ray Fluorescence Spectrometry
• Effective Date: 10-Nov-2002
• Referred By: ASTM D4803-18 - Standard Test Method for Predicting Heat Buildup in PVC Building Products
• Effective Date: 10-Nov-2002
• Referred By: ASTM F2136-18 - Standard Test Method for Notched, Constant Ligament-Stress (NCLS) Test to Determine Slow-Crack-Growth Resistance of HDPE Resins or HDPE Corrugated Pipe
• Effective Date: 10-Nov-2002
• 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-Nov-2002
• Referred By: ASTM D2103-15 - Standard Specification for Polyethylene Film and Sheeting
• Effective Date: 10-Nov-2002

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 4703 – 02
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.
6
1. Scope * Specimens of Thermoplastic Materials
1.1 This practice covers the compression molding of ther-
3. Terminology
moplastic granules and milled stock for the preparation of test
2
3.1 Definitions of Terms Specific to This Standard:
specimens.
3.1.1 average cooling rate (°C/min), n—the cooling rate
1.2 While conditions for certain materials are given, the
calculated by dividing the difference between the molding and
primary source of specific conditions shall be the material
demolding temperatures by the time required to cool the mold
specification standards for each type of material.
to the demolding temperature.
1.3 The values stated in SI units are to be regarded as the
3.1.2 cooling rate (°C/h), n—the rate of cooling obtained by
standard. The values given in parentheses are for information
controlling the flow of the cooling fluid in such a way that
only.
during each 10-min interval, the deviation from this specified
1.4 This standard does not purport to address all of the
cooling rate shall not exceed the specified tolerance.
safety concerns, if any, associated with its use. It is the
3.1.3 demolding temperature, n—the temperature of the
responsibility of the user of this standard to establish appro-
mold or the press platens at the end of the cooling time,
priate safety and health practices and determine the applica-
measured in the nearest vicinity to the molded material.
bility of regulatory limitations prior to use.
3.1.3.1 Discussion—For positive molds, holes are normally
NOTE 1—The main body of this practice is equivalent to ISO 293-1986.
drilled in the mold for measuring the temperatures defined in
Annex A1 and ISO 293-1986 differ in some details; however, specimens
3.1.3 and 3.1.4.
prepared using Annex A1, Procedure A should be equivalent to those
3.1.4 molding temperature, n—the temperature of the mold
prepared using ISO 293-1986, Cooling Method D. Specimens prepared
or the press platens during the preheating and molding time,
using Annex A1, Procedure C should be equivalent to those prepared
measured in the nearest vicinity to the molded material.
using ISO 293-1986, Cooling Method B. However, due to the greater
cooling rate tolerances of the ISO standard, specimens prepared according 3.1.5 molding time, n—the time during which full pressure
to ISO Cooling Method B may not be equivalent to Annex A1, Procedure
is applied while maintaining the molding temperature.
C.
3.1.6 picture frame mold, n—a flat piece of metal, usually of
brass or steel, that has a center portion removed to provide the
2. Referenced Documents
specified shape and dimensions of the final molding. The
2.1 ASTM Standards:
thickness of the metal is dependent on the desired thickness of
3
D 618 Practice for Conditioning Plastics for Testing
the finished molding, taking into consideration the shrinkage of
D 1248 Specification for Polyethylene Plastics Extrusion
the material to be molded. The picture frame mold is some-
3
Materials for Wire and Cable
times referred to as a chase.
D 3350 Specification for Polyethylene Plastics Pipe and
3.1.7 preheating time, n—the time required to heat the
4
Fittings Materials
material in the mold up to the molding temperature while
D 4976 Specification for Polyethylene Plastics Molding and
maintaining the contact pressure.
5
Extrusion Materials
ISO 293-1986 Plastics—Compression Moulding Test
4. Significance and Use
4.1 The methods by which sample materials are prepared
and molded influence the mechanical properties of the speci-
1
This practice is under the jurisdiction of ASTM Committee D20 on Plastics and
men. Unlike injection molding, the objective of compression
is the direct responsibility of Subcommittee D20.09 on Specimen Preparation.
Current edition approved November 10, 2002. Published January 2003. Origi- molding is to produce test specimens or sheets that are both
nally approved in 1991. Last previous edition approved in 2000 as D 4703 – 00.
2
This practice was created as a coalescence of and replacement for Practices
D 1928, D 2292, D 3010, and D 3463.
3 6
Annual Book of ASTM Standards, Vol 08.01. ISO/IEC Selected Standards for Testing Plastics, available from ASTM. Also
4
Annual Book of ASTM Standards, Vol 08.02. available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th
5
Annual Book of ASTM Standards, Vol 08.03. Floor,
...