1、Designation: D706 09D706 15Standard Classification System and Basis for Specifications forCellulose Acetate Molding and Extrusion Compounds (CA)1This standard is issued under the fixed designation D706; the number immediately following the designation indicates the year oforiginal adoption or, in th
2、e case 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 U.S. Department of Defense.1. Scope*1.1
3、 This classification system covers requirements for cellulose acetate thermoplastic compounds plasticized with either diethylphthalate or dimethyl phthalate and are suitable for injection molding and extrusion. These compounds have an acetyl contentbetween 39 and 40 %. It does not include materials
4、compounded for special application. Cellulosic plastic materials, beingthermoplastic, are reprocessable and recyclable. This classification system allows for the use of those cellulosic materials, providedthat all specific requirements of this classification system are met.1.2 The properties include
5、d in this classification system are those required to identify the compositions covered. Otherrequirements necessary to identify particular characteristics important to specialized applications are specified by using the suffixesas given in Section 5.1.3 This classification system and subsequent lin
6、e call out (specification) are intended to provide a means of calling out plasticmaterials used in the fabrication of end items or parts. It is not intended for the selection of materials. Material selection can bemade by those having expertise in the plastic field only after careful consideration o
7、f the design and performance required of thepart, environment to which it will be exposed, fabrication process to be employed, costs involved, and inherent properties of thematerial other than those covered by this classification system.1.4 The values stated in SI units are to be regarded as standar
8、d.1.5 The following safety hazards caveat pertains only to the test method portion, Section 11, of this classification system.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 approp
9、riate safety and health practices and determine the applicability of regulatory limitations priorto use.NOTE 1There is no known ISO equivalent to this standard.2. Referenced Documents2.1 ASTM Standards:2D256 Test Methods for Determining the Izod Pendulum Impact Resistance of PlasticsD570 Test Method
10、 for Water Absorption of PlasticsD618 Practice for Conditioning Plastics for TestingD635 Test Method for Rate of Burning and/or Extent and Time of Burning of Plastics in a Horizontal PositionD638 Test Method for Tensile Properties of PlasticsD790 Test Methods for Flexural Properties of Unreinforced
11、and Reinforced Plastics and Electrical Insulating MaterialsD792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by DisplacementD883 Terminology Relating to PlasticsD1003 Test Method for Haze and Luminous Transmittance of Transparent PlasticsD1600 Terminology for Abbrevia
12、ted Terms Relating to PlasticsD1729 Practice for Visual Appraisal of Colors and Color Differences of Diffusely-Illuminated Opaque MaterialsD3641 Practice for Injection Molding Test Specimens of Thermoplastic Molding and Extrusion Materials1 This classification system is under the jurisdiction of AST
13、M Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved Nov. 1, 2009May 1, 2015. Published December 2009June 2015. Originally approved in 1943. Last previous edition approved in 20052009 asD706 - 05.D706 - 09. DOI: 10.152
14、0/D0706-09.10.1520/D0706-15.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM stan
15、dard 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 users consult prior editions as appropriate. In all case
16、s 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 Conshohocken, PA 19428-2959. United States1D3892 Practice f
17、or Packaging/Packing of PlasticsD4000 Classification System for Specifying Plastic MaterialsD5740 Guide for Writing Material Standards in the Classification FormatD7209 Guide for Waste Reduction, Resource Recovery, and Use of Recycled Polymeric Materials and Products (Withdrawn2015)3E308 Practice fo
18、r Computing the Colors of Objects by Using the CIE System3. Terminology3.1 DefinitionsThe terminology used in this classification system is in accordance with Terminologies D883 and D1600.4. Classification4.1 This classification system covers the following groups, classes, and grades (see Table CA):
19、4.1.1 Group 1High impact strength, diethyl phthalate plasticizer.4.1.2 Group 2High tensile strength, diethyl phthalate plasticizer.4.1.3 Group 3High impact strength, dimethyl phthalate plasticizer.4.1.4 Group 4High tensile strength, dimethyl phthalate plasticizer.4.1.5 ClassAccording to plasticizer
20、content and properties 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 in Table CA, they shall be indicated through the use of suffixes.5.2 A list of suffixes can be found in Classi
21、fication System D4000 (Table 3) and can be used for additional requirements asappropriate. Additional suffixes will be added to that classification system as test methods and requirements are developed andrequested.5.3 Color and opacity shall be within the limits defined in 6.3.5.4 Commonly used suf
22、fixes for cellulose acetate are shown as follows:T = transmittance requirements as designed designated by the following digits:First Digit1 = total luminous transmittance determined in accordance with Procedure A of Test Method D1003.Second Digit1 = total transmittance, 80 % min.5.5 An example of th
23、is 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 phthalate plasticizer.2 = Class 2Plasticizer Range from 35 to 40 % (see Table CA, Footnote 1).2 = Grade 2Extrusio
24、n Application.FA053 = Flammability requirement from Classification System D4000Burn rate maximum of 50 mm/min with 3 mmminimum thickness, when tested in accordance with Test Method D635NOTE 2CA0122 corresponds to the following physical property requirements in Table CA:Specific gravity: 1.25-1.28.Te
25、nsile 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 composition and size, and as free of contamination as can be achi
26、eved by goodmanufacturing practice.6.2 If these materials contain colorants in the nominal amounts ordinarily employed, such additives shall not alter the abilityof the materials to meet the specified properties.3 The last approved version of this historical standard is referenced on www.astm.org.D7
27、06 1526.3 The color of material supplied shall be comparable, within commercial match tolerances, to the color of standard samplesprepared by the manufacturer.7. Physical Requirements7.1 Test specimens of the material shall conform to the requirements prescribed in Table CA.7.2 Molded specimens, for
28、 those tests requiring them, shall be prepared in accordance with Section 10.7.3 Conformance to the requirements of this classification system shall be determined in accordance with Section 11.8. Sampling8.1 Sampling shall be statistically adequate to satisfy the requirements of 12.4.8.2 A batch or
29、lot shall be constituted as a unit of manufacture as prepared for shipment and can consist of a blend of two ormore “production runs.”9. Number of Tests9.1 Routine testing of each batch or lot shall be limited to properties designated in Table CA of this classification system.9.2 One set of samples
30、for those tests that are designated (Section 12) shall be considered sufficient for testing the batch or lot.The average results from those samples shall comply with the requirements prescribed in this classification system.10. Specimen Preparation10.1 Physical property requirements in Table CA are
31、based on injection molded specimens 3.2 mm thick. Specimens machinedfrom compression-molded blanks or extruded strips can be used, provided it can be shown that the results are comparable.10.2 Prior to molding cellulose acetate, dry the material to a moisture content of 0.2 % or less. The primary re
32、ason for dryingthe material is to eliminate visual defects such as surface imperfections and bubbles. Material spread in a tray to a maximum depthof 50 mm and exposed in a circulating-air oven at 75 to 90C for 3 h is recommended. Formulations containing either very lowor very high levels of plastici
33、zer can require slightly higher or lower drying temperatures respectively. Control the injectionmolding cycles in accordance with Practice D3641, using a melt temperature 25 to 35C above the “cold point.” (The “cold point”is the lowest melt temperature at which it is possible to obtain a full shot w
34、hen all other operating variables are held constant withinthe normal operating range.) Mold temperatures between 35 and 60C have been found desirable.As a rule, thin-section moldingsand higher hardness materials (lower plasticizer content) require higher mold temperatures.10.3 Test specimens injecti
35、on molded from cellulosic materials are subject to “overpacking” if the gate size is too large, andthis can result in brittleness in the gate area as well as throughout the entire specimen. A gate size 1.5 mm square has been foundto produce satisfactory test specimens.11. Test Methods11.1 Determine
36、the properties defined by this classification system in accordance with the following test methods:11.1.1 All tests shall be performed in the standard laboratory atmosphere as defined by Practice D618.11.1.2 Test specimens shall be conditioned in accordance with Procedure A of Practice D618.11.1.3 C
37、olor-VisualPractice D172911.1.4 Color-QuantitativePractice E30811.1.5 Plasticizer ContentThe method for plasticizer content shall be specified.11.1.6 Specific GravityTest Methods D792.11.1.7 Tensile Stress at YieldTest Method D638, Type I test specimen, 50-mm/min testing speed.11.1.8 Flexural Modulu
38、sTest Methods D790, 1.27-mm/min testing speed.11.1.9 Impact Strength (Izod)Test Method A of Test Method D256. Specimen size: 63.5 mm long by 12.7 mm wide by 3.2mm thick.11.1.10 Water AbsorptionTest Method D570, 24-h immersion.NOTE 3The ungated “tab end” (75 mm long) of a Test Method D638, Type I ten
39、sile bar will give comparable results and can be used if the primaryspecimen type is not available. Condition in accordance with Test Method D570.11.1.11 Weight Loss on HeatingCondition test specimens, 50.8 mm in diameter or 50.8 mm wide by 63.5 mm long by 3.2 mmthick, for 48 h over anhydrous calciu
40、m chloride at 23 6 2C or 4 h at 70 6 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 the primaryspecimen type is not available. Weigh three specimens and place them in a circulating-air oven for 72 h at 82 6 2C. S
41、upport the specimens flatwiseon a screen in the oven. Upon removal from the oven, cool the specimens in a desiccator over anhydrous calcium chloride to 23 6 2C. Weigh thespecimens and calculate the weight loss on heating as a percentage of the conditioned weight as follows:weight loss on heating,%5W
42、12W2!W13100 (2)D706 153where: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 supplied with reference to a specification based on this classification systemshall be for
43、conformance to the requirements specified herein.12.2 Lot-acceptance inspection shall be the basis on which acceptance or rejection of the lot is made. The lot-acceptanceinspection shall consist of plasticizer content determination (see Table CA, Footnote 1) and color as specified in 6.3.12.3 Period
44、ic check inspection with reference to a specification based on this classification system shall consist of the tests forall requirements of the material under the specification. Inspection frequency shall be adequate to ensure that the material iscertifiable in accordance with 12.4.12.4 Certificatio
45、n shall be that the material was manufactured by a process in statistical control, sampled, tested, and inspectedin accordance with this classification system and that the average values for the lot meet the requirements of the classificationsystem (line call out).12.5 Areport of test results shall
46、be furnished when requested. The report shall consist of results of the lot acceptance inspectionfor the shipment, the results of the most recent periodic-check inspection, and the percent by weight of recycled plastic, as definedin Guide D7209, if requested.NOTE 5TheASTM publication Manual on Prese
47、ntation of Data and Control Chart Analysis, 7th8th Edition, stock number: MNL7A,MNL7-8TH-EB,provides detailed information about statistical process control.13. Rejection13.1 Material that fails to conform to all the requirements of this classification system is not to be certified.14. Packaging, Pac
48、king, and Marking14.1 The provisions of Practice D3892 apply to packaging, packing, and marking of containers for plastic materials.15. Keywords15.1 cellulose acetate; classification system; line callout; plastic; recycled; specificationD706 154TABLE CA Detailed Physical Property RequirementsMateria
49、l: CA (Cellulose Acetate)Plasticizer Base: Groups 01 and 02-Diethyl phthalate SpecificGravity,TestMethodsD792TensileStress atYield, TestMethodD638, min,MPaFlexuralModulus,Test Meth-ods D790,min, MPaIzod Im-pactStrength,TestMethodD256 mm,J/mWater Absorption, TestMethod D570,max, %WeightLoss onHeating,Paragraph11.1.11,max, %Group Description ClassPlasticizerContentA ,% Grade DescriptionWeightGainBSolubleLoss01 High impactstrength(diethylphthalatebased)1 37-42 120injectionextrusionother1.25-1.281.25-1.2817178608602302305.05.01.81.810.010.02 35-40
