1、Designation: D787 09 D787 12Standard Specification forEthyl Cellulose Molding and Extrusion Compounds1This standard is issued under the fixed designation D787; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisi
2、on. A 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 plas
3、ticized ethyl cellulose thermoplastic compounds suitable for injectionmolding 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
4、 precautionary statement pertains only to the 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 health
5、practices and determine the applicability of regulatory limitations priorto use.NOTE 1There is no known ISO equivalent to this specification.2. Referenced Documents2.1 ASTM Standards:2D256 Test Methods for Determining the Izod Pendulum Impact Resistance of PlasticsD570 Test Method for Water Absorpti
6、on of PlasticsD618 Practice for Conditioning Plastics for TestingD638 Test Method for Tensile Properties of PlasticsD648 Test Method for Deflection Temperature of Plastics Under Flexural Load in the Edgewise PositionD785 Test Method for Rockwell Hardness of Plastics and Electrical Insulating Materia
7、lsD792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by DisplacementD883 Terminology Relating to PlasticsD1505 Test Method for Density of Plastics by the Density-Gradient TechniqueD3641 Practice for Injection Molding Test Specimens of Thermoplastic Molding and Extrusio
8、n MaterialsD3892 Practice for Packaging/Packing of Plastics3. Terminology3.1 Terms in this specification are in accordance with Terminology D883.4. Classification4.1 This specification covers two types and eleven grades of ethyl cellulose molding and extrusion compounds as classified inaccordance wi
9、th 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 1.5. Ordering Information5.1 Purchase orders for, or inquiries
10、about, the materials described in this specification shall identify the following:5.1.1 The number of this specification and the required type and grade chosen from Table 1, for example, D787 Type 1, Grade1.5.1.2 Supplementary requirements in accordance with this specification if necessary.1 This sp
11、ecification 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 Sept. 1, 2009Aug. 1, 2012. Published September 2009August 2012. Originally approved in 1944. Last previous edition appro
12、ved in 20032009as D787 96D787(2003). 09. DOI: 10.1520/D0787-09. 10.1520/D0787-12.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary pa
13、ge on the ASTM website.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. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that
14、users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Con
15、shohocken, PA 19428-2959. United States15.1.3 Color and opacity within the limits defined in 6.4.5.1.4 Particle form and size if choice is available.5.1.5 Such other requirements as may be agreed between the seller and the purchaser.6. Materials and Manufacture6.1 Materials supplied under this speci
16、fication shall be ethyl cellulose plastics in the form of pellets unless otherwise specified.6.2 Material supplied in these forms shall be as uniform in composition and size and as free of contamination as can be achievedby good manufacturing practice.6.3 These materials may contain colorants in the
17、 nominal amounts ordinarily employed, but such additives shall not alter theability of the materials to meet the specified properties.6.4 The color and transparency or opacity of items fabricated under the conditions recommended by the manufacturer of thematerial shall be comparable within commercia
18、l match tolerances to the color and transparency or opacity of samples submittedin advance by the manufacturer and approved by the purchaser.7. Physical Requirements7.1 Test specimens of the material shall conform to the requirements prescribed in Table 1.7.2 Molded specimens for those tests requiri
19、ng them shall be prepared as described in Section 10.7.3 Flow temperature of a given compound shall be within 65C of the flow temperature designated in the contract or order.7.4 Conformance to the requirements of this specification shall be determined by means of the tests identified in Section 11un
20、less otherwise specified.8. Sampling8.1 Sampling shall be statistically adequate to satisfy the requirements of 12.4.8.2 For sampling purposes, a batch or lot shall be considered a unit of manufacture as prepared for shipment and may consistof a blend of two or more production runs of material.TABLE
21、 1 Detailed Requirements for Molded Test SpecimensNOTE 1ftlbf/in. 53.3378660 = joules per metre. Megapascals (MPa) = newtons 106 per metre squared.PropertyType I Type II TestMethodsGrade1 Grade2 Grade3 Grade4 Grade5 Grade6 Grade7 Grade8 Grade9 Grade10 Grade11Specific gravity, unpigmented, max at 23/
22、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 D792Hardness (Rockwell) R scale, min 110 110 105 105 100 95 105 80 75 75 50 D785Tensile strength at 23C, min:MPapsi44.8650041.4600038.1540033.0480031.0450024.2380027.6400024.1350020.7300020.0330015.92900D638Impact strength (Izod)
23、, minat 23C (73.4F):J/m of notchftlbf/in. of notch90.71.790.71.7106.72.0106.72.0117.32.2149.52.8186.73.5213.54.0293.45.5213.54.0320.36.0D256at 40C (40F):J/m of notchftlbf/in. of notch26.70.526.70.526.70.526.70.526.70.526.70.553.41.064.11.280.11.553.41.080.11.5D256Deflection temperature, min:at 1820-
24、kPa (264-psi) fiber stress:CF8218077170711606615060140491206615077170711606014049120D648at 455-kPa (66-psi) fiber stress:CF94200881908218077170711606615082180821808218077170D648Water 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 D570Weight loss on heating (72 h at 82
25、C), max % 0.3 0.4 0.6 0.8 1.5 1.8 2.0 1.2 2.0 2.0 2.0D787 1229. Number of Tests9.1 Routine testing of each batch or lot shall be limited to properties designated in Table 1 of this specification.10. Specimen Preparation10.1 Requirements in Table 1 are based on injection molded specimens 3.2 mm (18 i
26、n.) thick. Machined specimens fromcompression-molded blanks or extruded strips may be used provided it can be shown that the results are comparable.10.2 Prior to molding ethyl cellulose, the material should be dried to a moisture content of 0.2 % or less. Material spread in atray to a maximum depth
27、of 51 mm (2 in.) and exposed in a circulating-air oven at 76.5 to 88C (170 to 190F) for 3 h shouldbe satisfactory. Control the injection molding condition on cycle in accordance with Practice D3641, using a material temperatureof 10 to 25C (13 to 45F) below the level that causes discoloration of the
28、 plastic. Mold temperatures of 48 to 71C (120 to 160F)have been found desirable. As a rule, thin section molding and the higher flow temperaturemolecular weight compounds requirethe higher mold temperature.11. Test Methods11.1 Determine the properties defined by this specification in accordance with
29、 the following methods:11.1.1 Unless otherwise specified, all tests shall be performed in the standard laboratory atmosphere as defined by PracticeD618.11.1.2 Unless otherwise specified, molded test specimens shall be conditioned in accordance with Procedure A of Practice D618.11.1.3 Rockwell Hardne
30、ssProcedure A of Test Method D785.11.1.4 Specific GravityMethod A of Test Methods D792, or Test Method D1505.11.1.5 Tensile StrengthTest Method D638, Type I test specimen, 5.0-mm (0.2-in.)/min testing speed.11.1.6 Impact Strength (Izod)Method A of Test Method D256. Specimen size: 63.5 mm (212 in.) l
31、ong, by 12.7 mm (12 in.)wide, by 3.2 mm (18 in.) thick.11.1.7 Deflection TemperatureTest Method D648. Condition test specimens in accordance with Procedure B of Practice D618.11.1.8 Water AbsorptionTest Method D570, 24-h immersion. Condition in accordance with Test Method D570.11.1.9 Weight Loss on
32、HeatingCondition test specimens, 50.8 mm (2 in.) in diameter or 50.8 mm wide by 63.5 mm (212 in.)long by 3.2 mm (18 in.) thick, for 48 h over anhydrous calcium chloride at 23 6 1C (73.4 6 1.8F). Weigh three specimens andthen place them in a circulating-air oven for 72 h at 82 6 1C (180 6 1.8F). Supp
33、ort the specimens flatwise on a screen in theoven. Upon removal from the oven, cool the specimens in a desiccator over anhydrous calcium chloride to 23 6 1C (73.4 61.8F). Then weigh the specimens and calculate the percentage weight loss on heating on the basis of the conditioned weight.12. Inspectio
34、n and Certification12.1 Inspection and certification of the material supplied with reference to a specification based on this classification systemshall be for conformance to the requirements specified herein.12.2 Lot-acceptance inspection shall be the basis on which acceptance or rejection of the l
35、ot 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 specification based upon this classification system shall consist of the testsspecified fo
36、r all requirements of the material under this classification system. Inspection frequency shall be adequate to ensure thematerial is certifiable in accordance with 12.4.12.4 Certification shall be that the material was manufactured by a process in statistical control, sampled, tested, and inspectedi
37、n accordance with this classification system and that the average values for the lot meet the requirements of the specification (linecallout).12.5 A report of the test results shall be furnished when requested. The report shall consist of results of the lot acceptanceinspection for the shipment and
38、the results of the most recent periodic-check inspection.NOTE 2The ASTM publication Manual on Presentation of Data and Control Chart Analysis, 7th Edition, stock number MNL7A,3 provides detailedinformation about statistical process control.13. Rejection13.1 If any failure occurs, the materials may n
39、ot be certified to this specification.3 Available from ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428, http:/www.astm.org.D787 12314. Packaging and Package Marking14.1 PackagingThe material shall be packaged in standard commercial containers, so constructed as to ensure accep
40、tance bycommon or other carriers for safe transportation to the point of delivery.14.2 Package MarkingShipping containers shall identify the material and its supplier, the batch or lot number, its type, andthe quantity contained.14.3 All packing, packaging, and marking provisions of Practice D3892 s
41、hall apply to this specification.15. Keywords15.1 cellulose; ethylcellulose; extrusion; molding; plasticized; specificationSUMMARY OF CHANGESCommittee D20 has identified the location of selected changes to this standard since the last issue(D787 - 96D787 - 09(2003) that may impact the use of this st
42、andard. (September(August 1, 2009)2012)(1) Revised Note 1 to conform to wording of Guide D4968.(1) Removed reference toReplaced the term discontinued standardsflow temperature D569,with D1897, andthe termD1898molecular weight in Sections 2, 8, 10.2, and 11.1.3.(3) Added reference to D3641 in Section
43、s 2 and 10.2.(4) Tied Section 8 to new subsection 12.4 for sampling requirements.(5) Deleted subsection 9.2 as it is no longer applicable.(6) Revised Section 12 to require statistical control of the process and update reporting requirements.(7) Replaced Test Method D758 in Table 1 with D256.(8) Edit
44、orially revised subsection 1.2, 8.1, and 11.1.8 and Table 1.ASTM 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 pa
45、tent rights, and the riskof infringement 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 ei
46、ther for revision of this standard 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
47、 hearing you shouldmake your 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 stan
48、dard 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D787 124
