ASTM D6339-98
(Specification)Standard Specification for Syndiotactic Polystyrene Molding and Extrusion (SPS)
Standard Specification for Syndiotactic Polystyrene Molding and Extrusion (SPS)
SCOPE
1.1 This specification covers syndiotactic polystyrene materials including homopolymer, copolymers and impact modified, suitable for molding and extrusion. Recycled product will be addressed in a separate standard.
1.2 This specification is intended to be a means of calling out plastic materials used in fabrication of end use items or parts. Material selection should be made by those having expertise in the plastics field after careful consideration of the design and the performance required of the part, the environment to which it will be exposed, the fabrication process to be employed, the inherent properties of the material other than those covered by this specification, and the economics.
1.3 The properties included in this specification are those required to identify the compositions covered. Other requirements necessary to identify particular characteristics important to specialized applications can be called out using the suffixes given in Section 5.
Note 1-There is no ISO equivalent
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Designation: D 6339 – 98
Standard Specification for
Syndiotactic Polystyrene Molding and Extrusion (SPS)
This standard is issued under the fixed designation D 6339; 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 D 1238 Test Methods for Flow Rate of Thermoplastics by
Extrusion Plastometer
1.1 This specification covers syndiotactic polystyrene ma-
D 1525 Test Method for Vicat Softening Temperature of
terials including homopolymer, copolymers and impact modi-
Plastics
fied, suitable for molding and extrusion. Recycled product will
D 1898 Practice for Sampling of Plastics
be addressed in a separate standard.
D 3641 Practice for Injection Molding Test Specimens of
1.2 This specification is intended to be a means of calling
Thermoplastic Molding and Extrusion Materials
out plastic materials used in fabrication of end use items or
D 3892 Practice for Packaging/Packing of Plastic
parts. Material selection should be made by those having
D 4000 Classification System for Specifying Plastic Mate-
expertise in the plastics field after careful consideration of the
rials
design and the performance required of the part, the environ-
D 5630 Test Method for Ash Content in Thermoplastics
ment to which it will be exposed, the fabrication process to be
2.2 Military Standard:
employed, the inherent properties of the material other than
MIL-STD-105 Sampling Procedure and Tables for Inspec-
those covered by this specification, and the economics.
tion by Attributes
1.3 The properties included in this specification are those
required to identify the compositions covered. Other require-
3. Terminology
ments necessary to identify particular characteristics important
3.1 Definitions—For definitions of technical terms pertain-
to specialized applications can be called out using the suffixes
ing to plastics used in this specification, see Terminology
given in Section 5.
D 883.
NOTE 1—There is no ISO equivalent.
4. Classification
2. Referenced Documents
4.1 Syndiotactic polystyrene materials are classified into
2.1 ASTM Standards:
groups according to classes and grades shown in the basic
D 256 Test Methods for Impact Resistance of Plastics and
properties table, Table SPS. Injection molded properties are the
Electrical Insulating Materials
preferred standard and are used for the basis of call out
D 618 Practice for Conditioning Plastics and Electrical
examples.
Insulating Materials for Testing
2 NOTE 2—An example of this classification system for SPS is as
D 638 Test Method for Tensile Properties of Plastics
follows: For SPS0111, the designation SPS would indicate SPS =
D 648 Test Method for Deflection Temperature of Plastics
syndiotactic polystyrene = homopolymer = general purpose, and 1 (grade)
under Flexural Load
= minimum grade requirements as found in Table SPS.
D 790 Test Methods for Flexural Properties of Unreinforced
4.1.1 To facilitate the incorporation of future or special
and Reinforced Plastics and Electrical Insulating Materi-
2 materials the “Other/Unspecified” category (0) for group, class,
als
and grade is shown in Table SPS. The basic properties can be
D 792 Test Methods for Specific Gravity (Relative Density)
2 obtained from Tables A or B as they apply (see 4.3).
of Plastic by Displacement
2 4.2 Reinforced and filled syndiotactic polystyrene materials
D 883 Terminology Relating to Plastics
are classified in accordance with Table SPS as noted or with
Table A.
This specification is under the jurisdiction of ASTM Committee D-20 on
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic Annual Book of ASTM Standards, Vol 08.02.
Materials. Annual Book of ASTM Standards, Vol 08.03.
Current edition approved Dec. 10, 1998. Published March 1999. Available from Standardization Documents Order Desk, Bldg. 4 Section D,
Annual Book of ASTM Standards, Vol 08.01. Philadelphia, PA, 199111-5094, Attn: PODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 6339
NOTE 7—Properties of pigmented or colored SPS materials can differ
4.2.1 Reinforced and Additive Materials—A single letter
from the properties of natural or unpigmented SPS material, depending on
will be used for the major reinforcement or combination, or
the choice of colorants and the concentration. The main property affected
both, along with two digits that indicate the percentage of
is ductility, as illustrated by a reduction in Izod impact strength. If specific
addition by mass with the tolerances as shown in Table 1.
properties of pigmented SPS materials are necessary, prior testing between
the materials supplier and end user should be initiated.
NOTE 3—This part of the system uses the type and percentages of
additive to designate the modification of the basic material. Percentage of
6. Basic Requirements
additives can be shown on the supplier’s Technical Data Sheet unless it is
proprietary. If necessary, additional requirements shall be indicated by the
6.1 Basic requirements from Table SPS, as they apply, are
use of the suffix part of the system, as given in Section 5.
always in effect unless these requirements are superseded by
NOTE 4—Ash content of filled or reinforced materials may be deter-
specific suffix requirements, which always take precedence.
mined using Test Method D 5630 where applicable.
7. General Requirements
4.2.2 Table A, Detail Requirements—An identifying num-
ber is made up of the letter A and five digits comprising the cell
7.1 The material composition shall be uniform and shall
numbers for the new requirements in the designated order as
conform to the requirements specified herein.
they appear in Table A.
8. Detail Requirements
4.2.2.1 Although the values listed are necessary to include
8.1 Test specimens for the various materials shall conform
the range of properties available in existing materials, users
to the requirements prescribed in Tables SPS, A, and B, and
should not infer that every possible combination of the
suffix requirements as they apply.
properties exists or can be obtained.
8.2 For the purpose of determining conformance, all speci-
NOTE 5—Using Table SPS and Table A, an example of a reinforced
fied limits for a specification (line callout) based on this
syndiotactic polystyrene of this classification system is as follows: The
classification system are absolute limits.
designation would indicate material requirements from Table A as:
SPS0110G15A12332
9. Sampling
where:
9.1 Sampling shall be in accordance with the sampling
0110 = Homopolymer, Table SPS,
procedure prescribed in Practice D 1898 or statistically ad-
G15 = Glass-reinforced at 15 % nominal (see 4.2.1),
equate to satisfy the requirements of 13.4. A lot of material
A = Table A for property requirements,
shall be considered as a unit of manufacture as prepared for
1 = Tensile strength 50 MPa,
shipment, and may consist of two or more production runs or
2 = Flexural modulus, 4000 MPa/min,
3 = Izod impact 80 J/m, minimum, batches.
3 = Deflection temperature, 150°C, minimum, and
10. Sample Preparation—Injection
2 = Specific gravity, 1.2, minimum.
If no properties are specified, the designation would be
10.1 The test specimens shall be molded by an injection
SPS0110G15A00000.
molding process in accordance with Practice D 3641 as fol-
4.3 Table B has been incorporated into this specification to
lows:
facilitate the classification of special materials where neither
10.1.1 For injection-molded samples 290 6 10°C is the
Table SPS nor Tabl
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