1、Designation: D707 09Standard Classification System and Basis for Specification forCellulose Acetate Butyrate Molding and ExtrusionCompounds1This standard is issued under the fixed designation D707; the number immediately following the designation indicates the year oforiginal adoption or, in the cas
2、e of revision, the year of last revision. 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 clas
3、sification system covers requirements for plas-ticized cellulose acetate butyrate thermoplastic compoundssuitable for injection molding and extrusion. These compoundshave a butyryl content less than 38 % and an acetyl content lessthan 15 % and can contain dyes and pigments. This classifica-tion syst
4、em does not include special materials compounded forspecial applications. Cellulosic plastic materials, being thermo-plastic, are reprocessable and recyclable. This classificationsystem allows for the use of those cellulosic materials, pro-vided that all specific requirements of this classification
5、systemare met.1.2 The properties included in this classification system arethose required to identify the compositions covered. Otherrequirements necessary to identify particular characteristicsimportant to specialized applications are specified by using thesuffixes as given in Section 5.1.3 This cl
6、assification system and subsequent line call out(specification) are intended to provide a means of calling outplastic materials used in the fabrication of end items or parts.It is not intended for the selection of materials. Materialselection can be made by those having expertise in the plasticfield
7、 only after careful consideration of the design and perfor-mance required of the part, environment to which it will beexposed, fabrication process to be employed, costs involved,and inherent properties of the material other than those coveredby this classification system.1.4 The values stated in SI
8、units are to be regarded asstandard.1.5 The following safety hazards caveat pertains only to thetest method portion, Section 12, of this classification system.This standard does not purport to address all of the safetyconcerns, if any, associated with its use. It is the responsibilityof the user of
9、this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.NOTE 1There is no known ISO equivalent to this standard.2. Referenced Documents2.1 ASTM Standards:2D149 Test Method for Dielectric Breakdown Voltage andDielectric S
10、trength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD256 Test Methods for Determining the Izod PendulumImpact Resistance of PlasticsD257 Test Methods for DC Resistance or Conductance ofInsulating MaterialsD570 Test Method for Water Absorption of PlasticsD618 Practice for C
11、onditioning Plastics for TestingD635 Test Method for Rate of Burning and/or Extent andTime of Burning of Plastics in a Horizontal PositionD638 Test Method for Tensile Properties of PlasticsD790 Test Methods for Flexural Properties of Unreinforcedand Reinforced Plastics and Electrical Insulating Mate
12、rialsD792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by DisplacementD883 Terminology Relating to PlasticsD1003 Test Method for Haze and Luminous Transmittanceof Transparent PlasticsD1600 Terminology for Abbreviated Terms Relating toPlasticsD1729 Practice for Visual
13、 Appraisal of Colors and ColorDifferences of Diffusely-Illuminated Opaque MaterialsD3641 Practice for Injection Molding Test Specimens ofThermoplastic Molding and Extrusion MaterialsD3892 Practice for Packaging/Packing of PlasticsD4000 Classification System for Specifying Plastic Materi-alsD5740 Gui
14、de for Writing Material Standards in the Classi-fication D 4000 Format1This classification system is under the jurisdiction ofASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved Nov. 1, 2009. Published December 2009
15、. Originallyapproved in 1943. Last previous edition approved in 2005 as D707 - 05. DOI:10.1520/D0707-09.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standard
16、s 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 19428-2959, United States.D7209 Guide for Waste Reduction, Resource Recovery, andUse of Recycled Polym
17、eric Materials and ProductsE308 Practice for Computing the Colors of Objects byUsing the CIE System3. Terminology3.1 DefinitionsThe terminology used in this classificationsystem is in accordance with Terminologies D883 and D1600.4. Classification4.1 This classification system covers the following gr
18、oups,classes, and grades (see Table CAB):4.1.1 Group 01High impact strength.4.1.2 Group 02High tensile strength.4.1.3 ClassAccording to plasticizer content and proper-ties specified in Table CAB.4.1.4 Grade 1For injection molding (general purpose).4.1.5 Grade 2For extrusion.5. Suffixes5.1 When requi
19、rements are needed that are not covered inTable CAB they shall be indicated through the use of suffixes.5.2 A list of suffixes can be found in Classification SystemD4000 (Table 3) and can be used for additional requirements asappropriate. Additional suffixes will be added to that classifi-cation sys
20、tem as test methods and requirements are developedand requested.5.3 Color and opacity shall be within the limits defined in6.3.5.4 Some of the more commonly used suffixes for celluloseacetate butyrate are shown as follows:E = electrical requirements as designated by the following digits:First Digit1
21、 = volume resistivityTest Methods D257.dielectric strengthTest Method D149 (short-time/step-by-step).Second Digit1 = volume resistivity and dielectric strength meet property require-ments as shown in Table 1.T = transmittance requirements as designated by the following digits:First Digit1 = total lu
22、minous transmittance determined in accordance with Proce-dure A of Test Method D1003.Second Digit1 = total luminous transmittance, 80 % min.5.5 An example of this classification system for a high-impact cellulose acetate butyrate formulation would be asfollows:CAB0122FA053CAB = Table CAB property re
23、quirements.01 = Group 01high impact strength.2 = Class 2Plasticizer range from 12 to 23 % (seeTable CAB, Footnote 1).2 = Grade 2Extrusion application.F053 = Flammability requirement from Classification Sys-tem D4000Burn rate maximum of 50 mm/minwith 3 mm minimum thickness, when tested inaccordance w
24、ith Test Method D635.NOTE 2“CAB0122” corresponds to the following physical propertyrequirements in Table CAB:Specific gravity: 1.151.19.Tensile stress at yield: 19 MPa min.Flexural modulus: 760 MPa min.Izod impact strength: 285 J/m min.Water absorption: 1.6 % max.Weight loss on heating: 2.7 % max.6.
25、 Materials and Manufacture6.1 Materials supplied in these forms shall be as uniform incomposition and size, and as free of contamination as can beachieved by good manufacturing practice.6.2 If these materials contain colorants in the nominalamounts ordinarily employed, such additives shall not alter
26、 theability of the materials to meet the specified properties.6.3 The color of material supplied shall be comparable,within commercial match tolerances, to the color of standardsamples prepared by the manufacturer.7. Physical Requirements7.1 Test specimens of the material shall conform to therequire
27、ments prescribed in Table CAB.7.2 Molded specimens, for those tests requiring them, shallbe prepared in accordance with Section 10.7.3 Conformance to the requirements of this classificationsystem shall be determined in accordance with Section 11.8. Sampling8.1 Sampling shall be statistically adequat
28、e to satisfy therequirements of 12.4.8.2 A batch or lot shall be constituted as a unit of manufac-ture as prepared for shipment and can consist of a blend of twoor more “production runs.”9. Number of Tests9.1 Routine testing of each batch or lot shall be limited toproperties designated in Table CAB
29、of this classificationsystem.9.2 One set of samples for those tests that are designated(Section 12) shall be considered sufficient for testing the batchor lot. The average results from those samples shall complywith the requirements prescribed in this classification system.10. Specimen Preparation10
30、.1 Physical property requirements in Table CAB arebased on injection-molded specimens 3.2 mm thick. Specimensmachined from compression-molded blanks or extruded stripscan be used, provided it can be shown that the results arecomparable.10.2 Prior to molding cellulose acetate butyrate, dry themateria
31、l to a moisture content of 0.2 % or less. The primaryreason for drying the material is to eliminate visual defectssuch as surface imperfections and bubbles. Material spread ina tray to a maximum depth of 50 mm and exposed in acirculating-air oven at 75 to 90C for3hisrecommended.Formulations containi
32、ng either very low or very high levels ofplasticizer can require slightly higher or lower drying tempera-tures respectively. Control the injection molding cycles inaccordance with Practice D3641, using a material temperatureof 25 to 35C above the “cold point.” (The “cold point” is thelowest material
33、 temperature at which it is possible to obtain aD707 092full shot when all other operating variables are held constantwithin the normal operating range.) Mold temperatures be-tween 35 and 60C have been found desirable. As a rule,thin-section moldings and higher hardness materials (lowerplasticizer c
34、ontent) require higher mold temperatures.10.3 Test specimens injection molded from cellulosic ma-terials are subject to “overpacking” if the gate size is too large,and this can result in brittleness in the gate area as well asthroughout the entire specimen. A gate size 1.5 mm square hasbeen found to
35、 produce satisfactory test specimens.11. Test Methods11.1 Determine the properties defined by this classificationsystem in accordance with the following test methods:11.1.1 All tests shall be performed in the standard labora-tory atmosphere as defined by Practice D618.11.1.2 Test specimens shall be
36、conditioned in accordancewith Procedure A of Practice D618.11.1.3 Color-VisualPractice D172911.1.4 Color-QuantitativePractice E30811.1.5 Plasticizer ContentThe test method for plasticizercontent shall be specified.11.1.6 Specific GravityTest Methods D792.11.1.7 Tensile Stress at YieldTest Method D63
37、8, Type Itest specimen, 50-mm/min testing speed.11.1.8 Flexural ModulusTest Methods D790, 1.27-mm/min testing speed.11.1.9 Impact Strength (Izod)Test Method A of TestMethod D256. Specimen size: 63.5 mm long by 12.7 mm wideby 3.2 mm thick.11.1.10 Water AbsorptionTest Method D570, 24-h im-mersion.NOTE
38、 3The ungated “tab end” (75 mm long) of a Test Method D638,Type I tensile bar will give comparable results and can be used if theprimary specimen type is not available. Condition in accordance with TestMethod D570.11.1.11 Weight Loss on HeatingCondition test specimens,50.8 mm in diameter or 50.8 mm
39、wide by 63.5 mm long by 3.2mm thick, for 48 h over anhydrous calcium chloride at 23 62Cor4hat706 2C.NOTE 4The ungated “tab end” (75 mm long) of a Test Method D638,Type I tensile bar will give comparable results and can be used if theprimary specimen type is not available. Weigh three specimens and p
40、lacethem in a circulating-air oven for 72 h at 82 6 2C. Support the specimensflatwise on a screen in the oven. Upon removal from the oven, cool thespecimens in a desiccator over anhydrous calcium chloride to 23 6 2C.Weigh the specimens and calculate the weight loss on heating as apercentage of the c
41、onditioned weight as follows:weight loss on heating, % 5W1W2!W13 100 (1)where:W1= original weight, g, after initial conditioning, andW2= weight, g, after 72 h in oven at 82C.12. Inspection and Certification12.1 Inspection and certification of the material suppliedwith reference to a specification ba
42、sed on this classificationsystem shall be for conformance to the requirements specifiedherein.12.2 Lot-acceptance inspection shall be the basis on whichacceptance or rejection of the lot is made. The lot-acceptanceinspection shall consist of plasticizer content determination(see Table CAB, Footnote
43、1) and color as specified in 6.3.12.3 Periodic check inspection with reference to a specifi-cation based on this classification system shall consist of thetests for all requirements of the material under the specifica-tion. Inspection frequency shall be adequate to ensure that thematerial is certifi
44、able in accordance with 12.4.12.4 Certification shall be that the material was manufac-tured by a process in statistical control, sampled, tested, andinspected in accordance with this classification system and thatthe average values for the lot meet the requirements of theclassification system (line
45、 call out).12.5 A report of test results shall be furnished when re-quested. The report shall consist of results of the lot acceptanceinspection for the shipment, the results of the most recentperiodic-check inspection, and the percent by weight of re-cycled plastic, as defined in Guide D7209, if re
46、quested.NOTE 5The ASTM publication Manual on Presentation of Data andControl Chart Analysis, 7th Edition, stock number: MNL7A, providesdetailed information about statistical process control.13. Rejection13.1 Material that fails to conform to the requirements ofthis classification system is not to be
47、 certified.14. Packaging and Package Marking14.1 The provisions of Practice D3892 apply to packaging,packing, and marking of containers for plastic materials.15. Keywords15.1 acetate; butyrate; cellulose; extrusion; molding; plasti-cized; recycled; specificationD707 093TABLE CAB Detailed Physical Pr
48、operty RequirementsMaterial: CAB(Cellulose Acetate Butyrate)SpecificGravity,TestMethodsD792TensileStress atYield, TestMethodD638, min,MPaFlexuralModulus,TestMethodsD790,min, MPaIzod ImpactStrength,Test MethodD256, min,J/mWater Absorption,Test Method D570,max, %Weight Losson Heating,Paragraph11.1.11,
49、 max,%Group Description ClassPlasticizerContentA,%Grade DescriptionWeightGainBSolubleLoss01 High impactstrength1 15-26 1 injection 1.15-1.19 16 620 335 1.5 0.8 3.22 extrusion 1.15-1.19 16 620 335 1.5 0.8 3.20 other2 12-23 1 injection 1.15-1.19 19 760 285 1.6 0.6 2.72 extrusion 1.15-1.19 19 760 285 1.6 0.6 2.70 other3 10-20 1 injection 1.16-1.20 22 900 240 1.6 0.4 2.22 extrusion 1.16-1.20 22 900 240 1.6 0.4 2.20 other4 8-16 1 injection 1.16-1.20 24 1030 190 1.7 0.3 1.82 extrusion 1.16-1.20 24 1030 190 1.7 0.3 1.80 other5 6-13 1 injection 1.17-1.21
