1、Designation: D 707 05Standard Specification forCellulose Acetate Butyrate Molding and ExtrusionCompounds1This standard is issued under the fixed designation D 707; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last re
2、vision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers requirements for plasticizedcellulose acetate butyrate thermoplastic compounds suitablefor inject
3、ion molding and extrusion. These compounds have abutyryl content less than 38 % and an acetyl content less than15 % and may or may not contain dyes and pigments. Thisspecification does not include special materials compoundedfor special applications. Cellulosic plastic materials, beingthermoplastic,
4、 are reprocessable and recyclable. This specifi-cation allows for the use of those cellulosic materials, providedthat all specific requirements of this specification are met.1.2 The properties included in this specification are thoserequired to identify the compositions covered. There may beother re
5、quirements necessary to identify particular character-istics important to specialized applications. These may bespecified by using the suffixes as given in Section 5.1.3 This classification system and subsequent line call out(specification) are intended to provide a means of calling outplastic mater
6、ials used in the fabrication of end items or parts.It is not intended for the selection of materials. Materialselection should be made by those having expertise in theplastic field after careful consideration of the design andperformance required of the part, environment to which it willbe exposed,
7、fabrication process to be employed, costs in-volved, and inherent properties of the material other than thosecovered by this classification system.1.4 The values stated in SI units are to be regarded asstandard.1.5 The following safety hazards caveat pertains only to thetest method portion, Section
8、12, 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 and determine the applicability of regulatory limita-tions prior to
9、 use.NOTE 1There is no equivalent or similar ISO standard.2. Referenced Documents2.1 ASTM Standards:2D 149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD 256 Test Method for Determining the Pendulum ImpactR
10、esistance of Notched Specimens of PlasticD 257 Test Methods for DC Resistance or Conductance ofInsulating MaterialsD 570 Test Method for Water Absorption of PlasticsD 618 Practice for Conditioning Plastics for TestingD 635 Test Method for Rate of Burning and/or Extent andTime of Burning of Self-Supp
11、orting Plastics in a Horizon-tal PositionD 638 Test Method for Tensile Properties of PlasticsD 790 Test Methods for Flexural Properties of Unreinforcedand Reinforced Plastics and Electrical Insulating MaterialsD 792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by Dis
12、placementD 883 Terminology Relating to PlasticsD 1003 Test Method for Haze and Luminous Transmittanceof Transparent PlasticsD 1600 Terminology for Abbreviated Terms Relating toPlasticsD 1729 Practice for Visual Evaluation of Color Differencesof Opaque MaterialsD 3641 Practice for Injection Molding T
13、est Specimens ofThermoplastic Molding and Extrusion MaterialsD 3892 Practice for Packaging/Packing of PlasticsD 4000 Classification System for Specifying Plastic Mate-rialsD 5740 Guide for Writing Material Standards in the Clas-sification D 4000 Format1This specification is under the jurisdiction of
14、 ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved July 1, 2005. Published July 2005. Originally approvedin 1943. Last previous edition approved in 1998 as D 707 - 98.2For referenced ASTM standards, visit the ASTM
15、 website, www.astm.org, orcontact ASTM Customer Service 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 H
16、arbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.E 308 Practice for Computing the Colors of Objects byUsing the CIE System3. Terminology3.1 DefinitionsThe terminology used in this specificationis in accordance with Terminologies D 883 and D 1600.4. Classification4.1 This spe
17、cification covers the following groups, 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 e
18、xtrusion.5. Suffixes5.1 When requirements 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 SystemD 4000 (Table 3) and may be used for additional requirementsas appropriate. Additional suffixes will b
19、e added to thatclassification system as test methods and requirements aredeveloped and 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
20、the following digits:First Digit1 = volume resistivityTest Methods D 257.dielectric strengthTest Method D 149 (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 follo
21、wing digits:First Digit1 = total luminous transmittance determined in accordance with Proce-dure A of Test Method D 1003.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:CAB
22、0122FA053CAB = Table CAB property requirements.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 D 4000Burn rate maximum of 50 mm/minwith 3 mm minimum
23、thickness, when tested inaccordance with Test Method D 635.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 % ma
24、x.Weight loss on heating: 2.7 % max.6. 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 These materials may contain colorants in the nominalamounts ordinarily
25、employed, but such additives shall not alterthe ability 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
26、 of the material shall conform to therequirements 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 specificationshall be determined in accordance with Section 11, unlessotherwise s
27、pecified.8. Sampling8.1 Sampling shall be statistically adequate 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 may consist of a blend of twoor more “production runs.”9. Number of Tests9.1 Routine testing of each batc
28、h or lot shall be limited toproperties designated in Table CAB of this specification.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
29、in this specification.9.3 If any failure occurs, the materials are not to be certifiedto this specification.10. Specimen Preparation10.1 Physical property requirements in Table CAB arebased on injection-molded specimens 3.2 mm thick. Specimensmachined from compression-molded blanks or extruded strip
30、smay be used, provided it can be shown that the results arecomparable.10.2 Prior to molding cellulose acetate butyrate, the mate-rial should be dried to a moisture content of 0.2 % or less. Theprimary reason for drying the material is to eliminate visualdefects such as surface imperfections and bubb
31、les. Materialspread in a tray to a maximum depth of 50 mm and exposed ina circulating-air oven at 75 to 90C for 3 h should besatisfactory. Formulations containing either very low or veryhigh levels of plasticizer may require slightly higher or lowerdrying temperatures respectively. Control the injec
32、tion mold-ing cycles in accordance with Practice D 3641, using a materialtemperature of 25 to 35C above the “cold point.” (The “coldD707052point” is the lowest material temperature at which it is possibleto obtain a full shot when all other operating variables are heldconstant within the normal oper
33、ating range.) Mold tempera-tures between 35 and 60C have been found desirable. As arule, thin-section moldings and higher hardness materials(lower plasticizer content) require higher mold temperatures.10.3 Test specimens injection molded from cellulosic ma-terials are subject to “overpacking” if the
34、 gate size is too large,and this can result in brittleness in the gate area as well asthroughout the entire specimen. To avoid this, the gate sizeshould be significantly smaller than those recommended inPractice D 3641. A gate size 1.5 mm square has been found toproduce satisfactory test specimens.1
35、1. Test Methods11.1 Determine the properties defined by this specificationin accordance with the following test methods:11.1.1 All tests shall be performed in the standard labora-tory atmosphere as defined by Practice D 618.11.1.2 Test specimens shall be conditioned in accordancewith Procedure A of
36、Practice D 618.11.1.3 Color-VisualPractice D 172911.1.4 Color-QuantitativePractice E 30811.1.5 Plasticizer ContentThe test method for plasticizercontent shall be as agreed upon between the manufacturer andthe purchaser.11.1.6 Specific GravityTest Methods D 792.11.1.7 Tensile Stress at YieldTest Meth
37、od D 638, Type Itest specimen, 50-mm/min testing speed.11.1.8 Flexural ModulusTest Methods D 790, 1.27-mm/min testing speed.11.1.9 Impact Strength (Izod)Test Method A of TestMethod D 256. Specimen size: 63.5 mm long by 12.7 mm wideby 3.2 mm thick.11.1.10 Water AbsorptionTest Method D 570, 24-h im-me
38、rsion.NOTE 3The ungated “tab end” (75 mm long) of a Test Method D 638,Type I tensile bar will give comparable results and can be used if theprimary specimen type is not available. Condition in accordance with TestMethod D 570.11.1.11 Weight Loss on HeatingCondition test specimens,50.8 mm in diameter
39、 or 50.8 mm 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 D 638,Type I tensile bar will give comparable results and can be used if theprimary specimen type is not available. Weigh three sp
40、ecimens and placethem 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 apercen
41、tage of the conditioned 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 spe
42、cification based 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 C
43、AB, Footnote 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 themateri
44、al is certifiable 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
45、 system (line 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 and the results of the most recentperiodic-check inspection.13. Rejection13.1 Material that fails to conform to the requireme
46、nts ofthis specification is not to be certified.14. Packaging and Package Marking14.1 The provisions of Practice D 3892 apply to packaging,packing, and marking of containers for plastic materials.15. Keywords15.1 acetate; butyrate; cellulose; extrusion; molding; plasti-cized; recycled; specification
47、D707053TABLE CAB Detailed Physical Property RequirementsMaterial: CAB(Cellulose Acetate Butyrate)SpecificGravity,TestMethodsD 792TensileStress atYield, TestMethodD 638, min,MPaFlexuralModulus,TestMethodsD 790,min, MPaIzod ImpactStrength,Test MethodD 256, min,J/mWater Absorption,Test Method D 570,max
48、, %Weight Losson Heating,Paragraph11.1.11, 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
49、 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 27 1170 155 1.7 0.3 1.32 extrusion 1.17-1.21 27 1170 155 1.7 0.3 1.30 other0 other 0 other02 High tensilestrength1 4-10 1 injection 1.18-1.21 31 1310 120 1.8 0.2 1.02 extrusion 1.18-1.21 31 1310 120 1.8 0.2 1.00 other2 2-8 1 injection 1.19-1.21 34 1450 90 1.9 0
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