ASTM D787-18
(Specification)Standard Specification for Ethyl Cellulose Molding and Extrusion Compounds
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 standard. The English values given are for information only.
1.3 The following precautionary statement pertains only to the Test Methods portion, Section 9 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
Note 1: There is no known ISO equivalent to this specification.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:D787 −18
Standard Specification for
1
Ethyl Cellulose Molding and Extrusion Compounds
This standard is issued under the fixed designation D787; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* D785Test Method for Rockwell Hardness of Plastics and
Electrical Insulating Materials
1.1 This specification covers requirements for plasticized
D792Test Methods for Density and Specific Gravity (Rela-
ethyl cellulose thermoplastic compounds suitable for injection
tive Density) of Plastics by Displacement
molding and extrusion. It does not include special materials
D883Terminology Relating to Plastics
compounded for special applications.
D1505Test Method for Density of Plastics by the Density-
1.2 The values stated in SI units are to be regarded as
Gradient Technique
standard. The English values given are for information only.
D3641Practice for Injection Molding Test Specimens of
1.3 The following precautionary statement pertains only to
Thermoplastic Molding and Extrusion Materials
the Test Methods portion, Section 9 of this specification. This D3892Practice for Packaging/Packing of Plastics
standard does not purport to address all of the safety concerns,
if any, associated with its use. It is the responsibility of the user 3. Terminology
of this standard to establish appropriate safety, health, and
3.1 Terms in this specification are in accordance with
environmental practices and determine the applicability of
Terminology D883.
regulatory limitations prior to use.
4. Classification
NOTE 1—There is no known ISO equivalent to this specification.
1.4 This international standard was developed in accor-
4.1 Thisspecificationcoverstwotypesandelevengradesof
dance with internationally recognized principles on standard-
ethyl cellulose molding and extrusion compounds as classified
ization established in the Decision on Principles for the
in accordance with Table 1. Type I materials are general
Development of International Standards, Guides and Recom- purpose and Type II are characterized by improved resistance
mendations issued by the World Trade Organization Technical
to impact, especially at low temperatures. The grades are
Barriers to Trade (TBT) Committee.
classified in accordance with their physical properties as
specified in Table 1.
2. Referenced Documents
4.1.1 A typical call out of material covered by this specifi-
2
cation would contain the number of this specification and the
2.1 ASTM Standards:
required type and grade chosen from Table 1, for example,
D256Test Methods for Determining the Izod Pendulum
D787 Type 1, Grade 1.
Impact Resistance of Plastics
D570Test Method for Water Absorption of Plastics
5. Materials and Manufacture
D618Practice for Conditioning Plastics for Testing
D638Test Method for Tensile Properties of Plastics
5.1 Materialssuppliedunderthisspecificationshallbeethyl
D648Test Method for Deflection Temperature of Plastics
cellulose plastics in the form of pellets unless otherwise
Under Flexural Load in the Edgewise Position
specified.
5.2 Material supplied shall be as uniform in composition
and size and as free of contamination as can be achieved by
1
This specification is under the jurisdiction of ASTM Committee D20 on
good manufacturing practice.
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic
Materials.
5.3 These materials possibly contain colorants in the nomi-
Current edition approved April 1, 2018. Published April 2018. Originally
nal amounts ordinarily employed. Only those materials of this
approved in 1944. Last previous edition approved in 2012 as D787– 12. DOI:
kind that meet the properties specified are covered by this
10.1520/D0787-18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or standard.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.4 The color and transparency or opacity of items fabri-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. cated under the conditions recommended by the manufacturer
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D787−18
TABLE 1 Detailed Requirements for Molded Test Specimens
6
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D787 − 12 D787 − 18
Standard Specification for
1
Ethyl Cellulose Molding and Extrusion Compounds
This standard is issued under the fixed designation D787; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. 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 standard. The English values given are for information only.
1.3 The following precautionary statement pertains only to the Test Methods portion, Section 109 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 safety, health, and healthenvironmental practices and determine the applicability
of regulatory limitations prior to use.
NOTE 1—There is no known ISO equivalent to this specification.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D256 Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
D570 Test Method for Water Absorption of Plastics
D618 Practice for Conditioning Plastics for Testing
D638 Test Method for Tensile Properties of Plastics
D648 Test Method for Deflection Temperature of Plastics Under Flexural Load in the Edgewise Position
D785 Test Method for Rockwell Hardness of Plastics and Electrical Insulating Materials
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D883 Terminology Relating to Plastics
D1505 Test Method for Density of Plastics by the Density-Gradient Technique
D3641 Practice for Injection Molding Test Specimens of Thermoplastic Molding and Extrusion Materials
D3892 Practice for Packaging/Packing of Plastics
3. Terminology
3.1 Terms in this specification are in accordance with Terminology D883.
4. Classification
4.1 This specification covers two types and eleven grades of ethyl cellulose molding and extrusion compounds as classified in
accordance with Table 1. Type I materials are general purpose and Type II are characterized by improved resistance to impact,
especially at low temperatures. The grades are classified in accordance with their physical properties as specified in Table 1.
4.1.1 A typical call out of material covered by this specification would contain the number of this specification and the required
type and grade chosen from Table 1, for example, D787 Type 1, Grade 1.
1
This specification is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic Materials.
Current edition approved Aug. 1, 2012April 1, 2018. Published August 2012April 2018. Originally approved in 1944. Last previous edition approved in 20092012 as
D787 – 09.12. DOI: 10.1520/D0787-12.10.1520/D0787-18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D787 − 18
TABLE 1 Detailed Requirements for Molded Test Specimens
6
NOTE 1—ft·lbf/in. × 53.3378660 = joules per metre. Megapascals (MPa) = newtons × 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 D792
23°C (73.4/73.4°F)
Hardness (Rockwell) R scale, min 110 110 105 10
...
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