1、Designation: D 787 09Standard Specification forEthyl Cellulose Molding and Extrusion Compounds1This standard is issued under the fixed designation D 787; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A
2、number in parentheses indicates the year of last reapproval. Asuperscript epsilon () 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*1.1 This specification covers requirements for plasticize
3、dethyl cellulose thermoplastic compounds suitable for injectionmolding and extrusion. It does not include special materialscompounded for special applications.1.2 The values stated in SI units are to be regarded asstandard. The English values given are for information only.1.3 The following precauti
4、onary statement pertains only tothe Test Methods portion, Section 10 of this specification. Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices an
5、d determine the applicability of regulatory limita-tions prior to use.NOTE 1There is no known ISO equivalent to this specification.2. Referenced Documents2.1 ASTM Standards:2D 256 Test Methods for Determining the Izod PendulumImpact Resistance of PlasticsD 570 Test Method for Water Absorption of Pla
6、sticsD 618 Practice for Conditioning Plastics for TestingD 638 Test Method for Tensile Properties of PlasticsD 648 Test Method for Deflection Temperature of PlasticsUnder Flexural Load in the Edgewise PositionD 785 Test Method for Rockwell Hardness of Plastics andElectrical Insulating MaterialsD 792
7、 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by DisplacementD 883 Terminology Relating to PlasticsD 1505 Test Method for Density of Plastics by the Density-Gradient TechniqueD 3641 Practice for Injection Molding Test Specimens ofThermoplastic Molding and Extrusion M
8、aterialsD 3892 Practice for Packaging/Packing of Plastics3. Terminology3.1 Terms in this specification are in accordance withTerminology D 883.4. Classification4.1 This specification covers two types and eleven grades ofethyl cellulose molding and extrusion compounds as classifiedin accordance with
9、Table 1. Type I materials are generalpurpose and Type II are characterized by improved resistanceto impact, especially at low temperatures. The grades areclassified in accordance with their physical properties asspecified in Table 1.5. Ordering Information5.1 Purchase orders for, or inquiries about,
10、 the materialsdescribed in this specification shall identify the following:5.1.1 The number of this specification and the required typeand grade chosen from Table 1, for example, D 787 Type 1,Grade 1.5.1.2 Supplementary requirements in accordance with thisspecification if necessary.5.1.3 Color and o
11、pacity within the limits defined in 6.4.5.1.4 Particle form and size if choice is available.5.1.5 Such other requirements as may be agreed between theseller and the purchaser.6. Materials and Manufacture6.1 Materials supplied under this specification shall be ethylcellulose plastics in the form of p
12、ellets unless otherwisespecified.6.2 Material supplied in these forms shall be as uniform incomposition and size and as free of contamination as can beachieved by good manufacturing practice.1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibili
13、ty of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved Sept. 1, 2009. Published September 2009. Originallyapproved in 1944. Last previous edition approved in 2003 as D 787 96(2003).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Ser
14、vice at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*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 194
15、28-2959, United States.6.3 These materials may contain colorants in the nominalamounts ordinarily employed, but such additives shall not alterthe ability of the materials to meet the specified properties.6.4 The color and transparency or opacity of items fabri-cated under the conditions recommended
16、by the manufacturerof the material shall be comparable within commercial matchtolerances to the color and transparency or opacity of samplessubmitted in advance by the manufacturer and approved by thepurchaser.7. Physical Requirements Physical Requirements7.1 Test specimens of the material shall con
17、form to therequirements prescribed in Table 1.7.2 Molded specimens for those tests requiring them shallbe prepared as described in Section 10.7.3 Flow temperature of a given compound shall be within65C of the flow temperature designated in the contract ororder.7.4 Conformance to the requirements of
18、this specificationshall be determined by means of the tests identified in Section11 unless otherwise specified.8. Sampling8.1 Sampling shall be statistically adequate to satisfy therequirements of 12.4.8.2 For sampling purposes, a batch or lot shall be considereda unit of manufacture as prepared for
19、 shipment and may consistof a blend of two or more production runs of material.9. Number of Tests9.1 Routine testing of each batch or lot shall be limited toproperties designated in Table 1 of this specification.10. Specimen Preparation10.1 Requirements in Table 1 are based on injection moldedspecim
20、ens 3.2 mm (18 in.) thick. Machined specimens fromcompression-molded blanks or extruded strips may be usedprovided it can be shown that the results are comparable.10.2 Prior to molding ethyl cellulose, the material should bedried to a moisture content of 0.2 % or less. Material spread ina tray to a
21、maximum depth of 51 mm (2 in.) and exposed in acirculating-air oven at 76.5 to 88C (170 to 190F) for 3 hshould be satisfactory. Control the injection molding conditionon cycle in accordance with Practice D 3641, using a materialtemperature of 10 to 25C (13 to 45F) below the level thatcauses discolor
22、ation of the plastic. Mold temperatures of 48 to71C (120 to 160F) have been found desirable. As a rule, thinsection molding and the higher flow temperature compoundsrequire the higher mold temperature.11. Test Methods11.1 Determine the properties defined by this specificationin accordance with the f
23、ollowing methods:11.1.1 Unless otherwise specified, all tests shall be per-formed in the standard laboratory atmosphere as defined byPractice D 618.TABLE 1 Detailed Requirements for Molded Test SpecimensNOTE 1ftlbf/in. 3 53.3378660 = joules per metre. Megapascals (MPa) = newtons 3 106per metre squar
24、ed.PropertyType I Type IITestMethodsGrade1Grade2Grade3Grade4Grade5Grade6Grade7Grade8Grade9Grade10Grade11Specific gravity, unpigmented, max at 23/23C (73.4/73.4F)1.13 1.13 1.12 1.12 1.11 1.10 1.12 1.12 1.11 1.11 1.10 D 792Hardness (Rockwell) R scale, min 110 110 105 105 100 95 105 80 75 75 50 D 785Te
25、nsile strength at 23C, min:MPapsi44.8650041.4600038.1540033.0480031.0450024.2380027.6400024.1350020.7300020.0330015.92900D 638Impact strength (Izod), minat 23C (73.4F):J/m of notchftlbf/in. of notch90.71.790.71.7106.72.0106.72.0117.32.2149.52.8186.73.5213.54.0293.45.5213.54.0320.36.0D 256at 40C (40F
26、):J/m of notchftlbf/in. of notch26.70.526.70.526.70.526.70.526.70.526.70.553.41.064.11.280.11.553.41.080.11.5D 256Deflection temperature, min:at 1820-kPa (264-psi) fiber stress:CF8218077170711606615060140491206615077170711606014049120D 648at 455-kPa (66-psi) fiber stress:CF94200881908218077170711606
27、615082180821808218077170D 648Water 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 570Weight loss on heating (72 h at 82C), max % 0.3 0.4 0.6 0.8 1.5 1.8 2.0 1.2 2.0 2.0 2.0D78709211.1.2 Unless otherwise specified, molded test specimensshall be conditioned in accorda
28、nce with Procedure A ofPractice D 618.11.1.3 Rockwell HardnessProcedure A of Test MethodD 785.11.1.4 Specific GravityMethod A of Test Methods D 792,or Test Method D 1505.11.1.5 Tensile StrengthTest Method D 638, Type I testspecimen, 5.0-mm (0.2-in.)/min testing speed.11.1.6 Impact Strength (Izod)Met
29、hod A of Test MethodD 256. Specimen size: 63.5 mm (212 in.) long, by 12.7 mm (12in.) wide, by 3.2 mm (18 in.) thick.11.1.7 Deflection TemperatureTest Method D 648. Con-dition test specimens in accordance with Procedure B ofPractice D 618.11.1.8 Water AbsorptionTest Method D 570, 24-h immer-sion. Con
30、dition in accordance with Test Method D 570.11.1.9 Weight Loss on HeatingCondition test specimens,50.8 mm (2 in.) in diameter or 50.8 mm wide by 63.5 mm (212in.) long by 3.2 mm (18 in.) thick, for 48 h over anhydrouscalcium chloride at 23 6 1C (73.4 6 1.8F). Weigh threespecimens and then place them
31、in a circulating-air oven for 72hat826 1C (180 6 1.8F). Support the specimens flatwiseon a screen in the oven. Upon removal from the oven, cool thespecimens in a desiccator over anhydrous calcium chloride to23 6 1C (73.4 6 1.8F). Then weigh the specimens andcalculate the percentage weight loss on he
32、ating on the basis ofthe conditioned weight.12. Inspection and Certification12.1 Inspection and certification of the material suppliedwith reference to a specification based on this classificationsystem shall be for conformance to the requirements specifiedherein.12.2 Lot-acceptance inspection shall
33、 be the basis on whichacceptance or rejection of the lot is made. The lot-acceptanceinspection shall consist of the tests listed as they apply:(1) Tensile Strength(2) Izod Impact Strength(3) Deflection Temperature12.3 Periodic-check inspection with reference to a specifi-cation based upon this class
34、ification system shall consist of thetests specified for all requirements of the material under thisclassification system. Inspection frequency shall be adequate toensure the material is certifiable in accordance with 12.4.12.4 Certification shall be that the material was manufac-tured by a process
35、in statistical control, sampled, tested, andinspected in accordance with this classification system and thatthe average values for the lot meet the requirements of thespecification (line callout).12.5 A report of the test results shall be furnished whenrequested. The report shall consist of results
36、of the lotacceptance inspection for the shipment and the results of themost recent periodic-check inspection.NOTE 2The ASTM publication Manual on Presentation of Data andControl Chart Analysis, 7th Edition, stock number MNL7A,3providesdetailed information about statistical process control.13. Reject
37、ion13.1 If any failure occurs, the materials may not be certifiedto this specification.14. Packaging and Package Marking14.1 PackagingThe material shall be packaged in stan-dard commercial containers, so constructed as to ensureacceptance by common or other carriers for safe transportationto the poi
38、nt of delivery.14.2 Package MarkingShipping containers shall identifythe material and its supplier, the batch or lot number, its type,and the quantity contained.14.3 All packing, packaging, and marking provisions ofPractice D 3892 shall apply to this specification.15. Keywords15.1 cellulose; ethylce
39、llulose; extrusion; molding; plasti-cized; specificationSUMMARY OF CHANGESCommittee D20 has identified the location of selected changes to this standard since the last issue(D 787 - 96(2003) that may impact the use of this standard. (September 1, 2009)(1) Revised Note 1 to conform to wording of Guid
40、e D 4968.(2) Removed reference to discontinued standards D 569,D 1897, and D 1898 in Sections 2, 8, 10.2, and 11.1.3.(3) Added reference to D 3641 in Sections 2 and 10.2.(4) Tied Section 8 to new subsection 12.4 for samplingrequirements.(5) Deleted subsection 9.2 as it is no longer applicable.(6) Re
41、vised Section 12 to require statistical control of theprocess and update reporting requirements.(7) Replaced Test Method D 758 in Table 1 with D 256.(8) Editorially revised subsection 1.2, 8.1, and 11.1.8 andTable 1.3Available from ASTM International, 100 Barr Harbor Drive, West Consho-hocken, PA 19
42、428, http:/www.astm.org.D787093ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof i
43、nfringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this sta
44、ndard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your
45、views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D787094
