ASTM D787-96

Standard Specification for Ethyl Cellulose Molding and Extrusion Compounds

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.

General Information

• Status: Historical
• Publication Date: 09-Apr-1996
• ICS: 83.140.99 - Other rubber and plastics products
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.15 - Thermoplastic Materials

Relations

• Replaced By: ASTM D787-96(2003) - Standard Specification for Ethyl Cellulose Molding and Extrusion Compounds
• Effective Date: 10-Jul-2003
• Referred By: ASTM D4000-23 - Standard Classification System for Specifying Plastic Materials
• Effective Date: 10-Apr-1996

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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.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 787 – 96
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.
1. Scope D 792 Test Methods for Specific Gravity (Relative Density)
and Density of Plastics by Displacement
1.1 This specification covers requirements for plasticized
D 883 Terminology Relating to Plastics
ethyl cellulose thermoplastic compounds suitable for injection
D 1505 Test Method for Density of Plastics by the Density-
molding and extrusion. It does not include special materials
Gradient Technique
compounded for special applications.
D 1897 Practice for Injection Molding Test Specimens of
1.2 The values stated in SI units are to be regarded as the
Thermoplastic Molding and Extrusion Materials
standard. The values given in parentheses are for information
D 1898 Practice for Sampling of Plastics
only.
D 3892 Practice for Packaging/Packing of Plastics
1.3 The following precautionary statement pertains only to
the Test Methods portion, Section 10 of this specification. This
3. Terminology
standard does not purport to address all of the safety concerns,
3.1 Terms in this specification are in accordance with
if any, associated with its use. It is the responsibility of the user
Terminology D 883.
of this standard to establish appropriate safety and health
practices and determine the applicability of regulatory limita-
4. Classification
tions prior to use.
4.1 This specification covers two types and eleven grades of
NOTE 1—There is no equivalent or similar ISO standard.
ethyl cellulose molding and extrusion compounds as classified
in accordance with Table 1. Type I materials are general
2. Referenced Documents
purpose and Type II are characterized by improved resistance
2.1 ASTM Standards:
to impact, especially at low temperatures. The grades are
D 256 Test Methods for Determining the Pedulum Impact
classified in accordance with their physical properties as
Resistance of Notched Specimens of Plastics
specified in Table 1.
D 569 Test Method for Measuring the Flow Properties of
Thermoplastic Molding Materials 5. Ordering Information
D 570 Test Method for Water Absorption of Plastics
5.1 Purchase orders for, or inquiries about, the materials
D 618 Practice for Conditioning Plastics and Electrical
described in this specification shall identify the following:
Insulating Materials for Testing
5.1.1 The number of this specification and the required type
D 638 Test Method for Tensile Properties of Plastics
and grade chosen from Table 1, for example, D 787 Type 1,
D 648 Test Method for Deflection Temperature of Plastics
Grade 1.
Under Flexural Load
5.1.2 Supplementary requirements in accordance with this
D 759 Practice for Conducting Physical Property Tests of
specification if necessary.
Plastics at Subnormal and Supernormal Temperatures
5.1.3 Color and opacity within the limits defined in 6.4.
D 785 Test Method for Rockwell Hardness of Plastics and
5.1.4 Particle form and size if choice is available.
Electrical Insulating Materials
5.1.5 Such other requirements as may be agreed between the
seller and the purchaser.
This specification is under the jurisdiction of ASTM Committee D-20 on
6. Materials and Manufacture
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic
6.1 Materials supplied under this specification shall be ethyl
Materials.
Current edition approved April 10, 1996. Published July 1996. Originally
cellulose plastics in the form of pellets unless otherwise
published as D 787 – 44 T. Last previous edition D 787 – 81 (1995).
specified.
This edition includes the addition of an ISO equivalency statement and a
6.2 Material supplied in these forms shall be as uniform in
Keywords section, the elimination of superfluous references to user/seller agree-
ments, and the removal of specific requirements relating to Federal/Military composition and size and as free of contamination as can be
procurement. Some references to specimens were changed to samples in keeping
achieved by good manufacturing practice.
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.
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.
D 787
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
6.3 These materials may contain colorants in the nominal 9. Number of Tests
amounts ordinarily employed, bu
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