ASTM D787-96(2003)

Standard Specification for Ethyl Cellulose Molding and Extrusion Compounds

ABSTRACT
This specification covers the standard requirements for plasticized ethyl cellulose thermoplastic compounds suitable for injection molding and extrusion. It does not however include special materials compounded for special applications. Materials shall be ethyl cellulose plastics in the form of pellets with uniform size and composition and may contain colorants in nominal amounts. Test specimens shall conform to the following physical property requirements: unpigmented specific gravity; Rockwell hardness; tensile strength; impact strength; deflection temperature; water absorption; and weight loss on heating.
SCOPE
1.1 This specification covers requirements for plasticized ethyl cellulose thermoplastic compounds suitable for injection molding and extrusion. It does not include special materials compounded for special applications.
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 The following precautionary statement pertains only to the Test Methods portion, Section 10 of this specification. 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—There is no equivalent or similar ISO standard.

General Information

• Status: Historical
• Publication Date: 09-Jul-2003
• ICS: 83.140.99 - Other rubber and plastics products
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.15 - Thermoplastic Materials

Relations

• Replaces: ASTM D787-96 - Standard Specification for Ethyl Cellulose Molding and Extrusion Compounds
• Effective Date: 10-Jul-2003
• Replaced By: ASTM D787-09 - Standard Specification for Ethyl Cellulose Molding and Extrusion Compounds
• Effective Date: 01-Sep-2009
• Referred By: ASTM D4000-23 - Standard Classification System for Specifying Plastic Materials
• Effective Date: 10-Jul-2003

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D 787 – 96 (Reapproved 2003)
Standard Specification for
Ethyl Cellulose Molding and Extrusion Compounds
This standard is issued under the fixed designation D 787; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope Electrical Insulating Materials
D 792 Test Methods for Specific Gravity (Relative Density)
1.1 This specification covers requirements for plasticized
and Density of Plastics by Displacement
ethyl cellulose thermoplastic compounds suitable for injection
D 883 Terminology Relating to Plastics
molding and extrusion. It does not include special materials
D 1505 Test Method for Density of Plastics by the Density-
compounded for special applications.
Gradient Technique
1.2 The values stated in SI units are to be regarded as the
D 1897 Practice for Injection Molding Test Specimens of
standard. The values given in parentheses are for information
Thermoplastic Molding and Extrusion Materials
only.
D 1898 Practice for Sampling of Plastics
1.3 The following precautionary statement pertains only to
D 3892 Practice for Packaging/Packing of Plastics
the Test Methods portion, Section 10 of this specification. This
standard does not purport to address all of the safety concerns,
3. Terminology
if any, associated with its use. It is the responsibility of the user
3.1 Terms in this specification are in accordance with
of this standard to establish appropriate safety and health
Terminology D 883.
practices and determine the applicability of regulatory limita-
tions prior to use.
4. Classification
NOTE 1—There is no equivalent or similar ISO standard.
4.1 This specification covers two types and eleven grades of
ethyl cellulose molding and extrusion compounds as classified
2. Referenced Documents
in accordance with Table 1. Type I materials are general
2.1 ASTM Standards:
purpose and Type II are characterized by improved resistance
D 256 Test Methods for Determining the Pedulum Impact
to impact, especially at low temperatures. The grades are
Resistance of Notched Specimens of Plastics
classified in accordance with their physical properties as
D 569 Test Method for Measuring the Flow Properties of
specified in Table 1.
Thermoplastic Molding Materials
D 570 Test Method for Water Absorption of Plastics 5. Ordering Information
D 618 Practice for Conditioning Plastics for Testing
5.1 Purchase orders for, or inquiries about, the materials
D 638 Test Method for Tensile Properties of Plastics
described in this specification shall identify the following:
D 648 Test Method for Deflection Temperature of Plastics
5.1.1 The number of this specification and the required type
Under Flexural Load
and grade chosen from Table 1, for example, D 787 Type 1,
D 759 Practice for Conducting Physical Property Tests of
Grade 1.
Plastics at Subnormal and Supernormal Temperatures
5.1.2 Supplementary requirements in accordance with this
D 785 Test Method for Rockwell Hardness of Plastics and
specification if necessary.
5.1.3 Color and opacity within the limits defined in 6.4.
5.1.4 Particle form and size if choice is available.
5.1.5 Suchotherrequirementsasmaybeagreedbetweenthe
This specification is under the jurisdiction of ASTM Committee D20 on
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic
seller and the purchaser.
Materials.
Current edition approved July 10, 2003. Published September 2003. Originally
6. Materials and Manufacture
approved in 1944. Last previous edition approved in 1996 as D 787 – 96.
6.1 Materials supplied under this specification shall be ethyl
This edition includes the addition of an ISO equivalency statement and a
Keywords section, the elimination of superfluous references to user/seller agree-
cellulose plastics in the form of pellets unless otherwise
ments, and the removal of specific requirements relating to Federal/Military
specified.
procurement. Some references to specimens were changed to samples in keeping
with normal usage within ASTM materials standards.
Annual Book of ASTM Standards, Vol 08.01.
3 4
Discontinued, see 1982 Annual Book of ASTM Standards , Vol 08.01. Annual Book of ASTM Standards, Vol 08.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 787 – 96 (2003)
TABLE 1 Detailed Requirements for Molded Test Specimens
NOTE 1—ft·lbf/in. 3 53.3378660 = joules per metre. Megapascals (MPa) = newtons 3 10 per metre squared.
Type I Type II
Test
Property
Grade Grade Grade Grade Grade Grade Grade Grade Grade Grade Grade
Methods
1 2 3 4 5 6 7 8 9 10 11
Specific gravity, unpigmented, max at 23/ 1.13 1.13 1.12 1.12 1.11 1.10 1.12 1.12 1.11 1.11 1.10 D 792
23°C [73.4/73.4°F]
Hardness (Rockwell) R scale, min 110 110 105 105 100 95 105 80 75 75 50 D 785
Tensile strength at 23°C, min:
MPa 44.8 41.4 38.1 33.0 31.0 24.2 27.6 24.1 20.7 20.0 15.9 D 638
psi 6500 6000 5400 4800 4500 3800 4000 3500 3000 3300 2900
Impact strength (Izod), min
at 23°C [73.4°F]:
J/m of notch 90.7 90.7 106.7 106.7 117.3 149.5 186.7 213.5 293.4 213.5 320.3 D 256
ft·lbf/in. of notch 1.7 1.7 2.0 2.0 2.2 2.8 3.5 4.0 5.5 4.0 6.0
at − 40°C [−40°F]:
J/m of notch 26.7 26.7 26.7 26.7 26.7 26.7 53.4 64.1 80.1 53.4 80.1 D 758
ft·lbf/in. of notch 0.5 0.5 0.5 0.5 0.5 0.5 1.0 1.2 1.5 1.0 1.5
Deflection temperature, min:
at 1820-kPa [264-psi] fiber stress:
°C 82 77 71 66 60 49 66 77 71 60 49 D 648
°F 180 170 160 150 140 120 150 170 160 140 120
at 455-kPa [66-psi] fiber stress:
°C 94 88 82 77 71 66 82 82 82 77 –
°F 200 190 180 170 160 150 180 180 180 170 –
Water absorption (24-h immersion), max % 1.7 1.5 1.4 1.2 1.1 1.0 1.3 1.5 1.5 1.5 1.5 D 570
Weight loss on heating (72 h at 82°C), max % 0.3 0.4 0.6 0.8 1.5 1.8 2.0 1.2 2.0 2.0 2.0 D 787
6.2 Material supplied in these forms shall be as uniform in 8.2 Forsamplingpurposes,abatchorlotshallbeconsidered
composition and size and as free of contamination as can be aunitofmanufactureaspreparedforshipmentandmayconsist
ach
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