1、Designation: D 706 05Standard Specification forCellulose Acetate Molding and Extrusion Compounds1This standard is issued under the fixed designation D 706; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.
2、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 celluloseacetate thermoplastic compounds plasticized with either di-ethyl phthalate or d
3、imethyl phthalate and are suitable forinjection molding and extrusion. These compounds have anacetyl content between 39 and 40 %. It does not includematerials compounded for special application. Cellulosic plas-tic materials, being thermoplastic, are reprocessable and recy-clable. This specification
4、 allows for the use of those cellulosicmaterials, provided that all specific requirements of this speci-fication are met.1.2 The properties included in this specification are thoserequired to identify the compositions covered. There may beother requirements necessary to identify particular character
5、-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 materials used in the fabrication of end items or parts.It
6、 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, fabrication process to be employed, costs in-volved,
7、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 11, of this specification. Thisstandard does not purp
8、ort 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 use.NOTE 1There is no equivalent or similar ISO stan
9、dard.2. Referenced Documents2.1 ASTM Standards:2D 256 Test Method for Determining the Pendulum ImpactResistance of Notched Specimens of PlasticsD 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 an
10、dTime of Burning of Self-Supporting 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-tiv
11、e Density) of Plastics by DisplacementD 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 Pra
12、ctice for Injection Molding Test Specimens ofThermoplastic Molding and Extrusion MaterialsD 3892 Practice for Packaging/Packing of PlasticsD 4000 Classification System for Specifying Plastic Mate-rialsE 308 Practice for Computing the Colors of Objects byUsing the CIE System3. Terminology3.1 Definiti
13、onsThe terminology used in this specificationis in accordance with Terminologies D 883 and D 1600.4. Classification4.1 This specification covers the following groups, classes,and grades (see Table CA):4.1.1 Group 1High impact strength, diethyl phthalateplasticizer.1This specification is under the ju
14、risdiction of 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 706 - 98.2For referenced ASTM standards, v
15、isit the ASTM 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 Internationa
16、l, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.1.2 Group 2High tensile strength, diethyl phthalateplasticizer.4.1.3 Group 3High impact strength, dimethyl phthalateplasticizer.4.1.4 Group 4High tensile strength, dimethyl phthalateplasticizer.4.1.5 ClassAccord
17、ing to plasticizer content and proper-ties specified in Table CA.4.1.6 Grade 1For injection molding (general purpose).4.1.7 Grade 2For extrusion.5. Suffixes5.1 When requirements are needed that are not covered inTable CA, they shall be indicated through the use of suffixes.5.2 A list of suffixes can
18、 be found in Classification SystemD 4000 (Table 3) and may be used for additional requirementsas appropriate. Additional suffixes will be 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
19、Commonly used suffixes for cellulose acetate are shownas follows:T = transmittance requirements as designed designated bythe following digits:First Digit1 = total luminous transmittance determined in accordancewith Procedure A of Test Method D 1003.Second Digit1 = total transmittance, 80 % min.5.5 A
20、n example of this classification system for a high-impact cellulose acetate formulation would be as follows:CA0122FA053 (1)CA = Table CA Property Requirements.01 = Group 01High Impact Strength, diethyl phtha-late plasticizer.2 = Class 2Plasticizer Range from 35 to 40 % (seeTable CA, Footnote 1).2 =
21、Grade 2Extrusion Application.FA053 = Flammability requirement from ClassificationSystem D 4000Burn rate maximum of 50 mm/min with 3 mm minimum thickness, when testedin accordance with Test Method D 635NOTE 2CA0122 corresponds to the following physical propertyrequirements in Table CA:Specific gravit
22、y: 1.25-1.28.Tensile stress at yield: 18 MPa min.Flexural modulus: 930 MPa min.Izod impact strength: 200 J/m min.Water absorption: 4.7 % max.Weight loss on heating: 10.0 % max.6. Materials and Manufacture6.1 Materials supplied shall be as uniform in compositionand size, and as free of contamination,
23、 as can be achieved bygood manufacturing practice.6.2 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.6.3 The color of material supplied shall be comparable,within commerc
24、ial match tolerances, to the color of standardsamples prepared by the manufacturer.7. Physical Requirements7.1 Test specimens of the material shall conform to therequirements prescribed in Table CA.7.2 Molded specimens, for those tests requiring them, shallbe prepared in accordance with Section 10.7
25、.3 Conformance to the requirements of this specificationshall be determined in accordance with Section 11.8. 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 cons
26、ist 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 CA of this specification.9.2 One set of samples for those tests that are designated(Section 12) shall be considered sufficient for testing the b
27、atchor lot. The average results from those samples shall complywith the requirements prescribed 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 CA are basedon injection mo
28、lded specimens 3.2 mm thick. Specimensmachined from compression-molded blanks or extruded stripsmay be used, provided it can be shown that the results arecomparable.10.2 Prior to molding cellulose acetate, dry the material to amoisture content of 0.2 % or less. The primary reason fordrying the mater
29、ial is to eliminate visual defects such assurface imperfections and bubbles. Material spread in a tray toa maximum depth of 50 mm and exposed in a circulating-airoven at 75 to 90C for 3 h should be satisfactory. Formulationscontaining either very low or very high levels of plasticizermay require sli
30、ghtly higher or lower drying temperaturesrespectively. Control the injection molding cycles in accor-dance with Practice D 3641, using a melt temperature 25 to35C above the “cold point.” (The “cold point” is the lowestmelt temperature at which it is possible to obtain a full shotwhen all other opera
31、ting variables are held constant within thenormal operating range.) Mold temperatures between 35 and60C have been found desirable. As a rule, thin-sectionmoldings and higher hardness materials (lower plasticizercontent) require higher mold temperatures.10.3 Test specimens injection molded from cellu
32、losic 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. To avoid this, the gate sizeD706052should be significantly smaller than those recommended inPractice D 3641. A gate size 1.5 mm sq
33、uare has been found toproduce satisfactory test specimens.11. 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 speci
34、mens shall be conditioned in accordancewith Procedure A of Practice D 618.11.1.3 Color-VisualPractice D 172911.1.4 Color-QuantitativePractice E 30811.1.5 Plasticizer ContentThe method for plasticizer con-tent shall be as agreed upon between the manufacturer and thepurchaser.11.1.6 Specific GravityTe
35、st Methods D 792.11.1.7 Tensile Stress at YieldTest Method 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 thi
36、ck.11.1.10 Water AbsorptionTest Method D 570, 24-h im-mersion.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 Los
37、s on HeatingCondition test specimens,50.8 mm in diameter 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 MethodD 638, Type I tensile bar will give comparable results and can be used ift
38、he primary specimen type is not available. Weigh three specimens andplace them in a circulating-air oven for 72 h at 82 6 2C. Support thespecimens flatwise on a screen in the oven. Upon removal from the oven,cool the specimens in a desiccator over anhydrous calcium chloride to 236 2C. Weigh the spec
39、imens and calculate the weight loss on heating asa percentage of the conditioned weight as follows:weight loss on heating, % 5W12 W2!W13 100 (2)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 ce
40、rtification 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 be the basis on whichacceptance or rejection of the lot is made. The lot-acceptanceinspection sha
41、ll consist of plasticizer content determination(see Table CA, 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. Inspe
42、ction frequency shall be adequate to ensure that thematerial 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 val
43、ues for the lot meet the requirements of theclassification 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. Rej
44、ection13.1 Material that fails to conform to all the requirements ofthis specification is not to be certified.14. Packaging, Packing, and Marking14.1 The provisions of Practice D 3892 apply to packaging,packing, and marking of containers for plastic materials.15. Keywords15.1 cellulose acetate; clas
45、sification system; line callout;plastic; recycled; specificationD706053TABLE CA Detailed Physical Property RequirementsMaterial: CA (Cellulose Acetate)Plasticizer Base: Groups 01 and 02-Diethyl phthalate SpecificGravity,TestMethodsD 792TensileStress atYield, TestMethodD 638, min,MPaFlexuralModulus,T
46、est Meth-ods D 790,min, MPaIzod Im-pactStrength,TestMethodD 256mm, J/mWater Absorption, TestMethod D 570,max, %WeightLoss onHeating,Paragraph11.1.11,max, %Group Description ClassPlasticizerContentA,% Grade DescriptionWeightGainBSolubleLoss01 High impactstrength(diethylphthalatebased)1 37-42 120injec
47、tionextrusionother1.25-1.281.25-1.2817178608602302305.05.01.81.810.010.02 35-40 120injectionextrusionother1.25-1.281.25-1.2818189309302002004.74.71.41.410.010.03 33-37 120injectionextrusionother1.25-1.291.25-1.291919110011001701704.34.31.11.19.09.04 29-35 120injectionextrusionother1.26-1.291.26-1.29
48、2323124012401501504.04.00.80.87.07.05 27-33 120injectionextrusionother1.26-1.291.26-1.292727138013801301303.53.50.60.66.06.00 other 0 other02 High tensilestrength(diethylphthalatebased)1 25-29 120injectionextrusionother1.27-1.301.27-1.303232152015201051053.23.20.50.54.04.02 23-27 120injectionextrusi
49、onother1.27-1.301.27-1.3036361580158090903.03.00.40.43.03.03 21-25 120injectionextrusionother1.27-1.301.27-1.3039391650165080802.92.90.40.42.02.04 19-23 120injectionextrusionother1.28-1.301.28-1.3041411860186055552.72.70.30.32.02.05 17-21 120injectionextrusionother1.28-1.301.28-1.3043432170217045452.52.50.20.21.01.06 12-18 120injectionextrusionother1.28-1.301.28-1.3045452410241030302.42.40.20.20.70.70 other 0 otherAThe test method for plasticizer content, as well as the target level for the product supplied, shall be as agreed upon between the manufact
