1、Designation: D707 09D707 15Standard Classification System and Basis for Specification forCellulose Acetate Butyrate Molding and ExtrusionCompounds (CAB)1This standard is issued under the fixed designation D707; the number immediately following the designation indicates the year oforiginal adoption o
2、r, in the 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. S
3、cope*1.1 This classification system covers requirements for plasticized cellulose acetate butyrate thermoplastic compounds suitablefor injection molding and extrusion. These compounds have a butyryl content less than 38 % and an acetyl content less than 15 %and can contain dyes and pigments. This cl
4、assification system does not include special materials compounded for specialapplications. Cellulosic plastic materials, being thermoplastic, are reprocessable and recyclable. This classification system allowsfor the use of those cellulosic materials, provided that all specific requirements of this
5、classification system are met.1.2 The properties included 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 Sec
6、tion 5.1.3 This classification system and subsequent line 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
7、 in the plastic field only after careful consideration of 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
8、 values stated in SI units are to be regarded as standard.1.5 The following safety hazards caveat pertains only to the test method portion, Section 12, of this classification system. Thisstandard does not purport to address all of the safety concerns, if any, associated with its use. It is the respo
9、nsibility of the userof this standard to establish appropriate 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:2D149 Test Method for Dielectric Breakdow
10、n Voltage and Dielectric Strength of Solid Electrical Insulating Materials atCommercial Power FrequenciesD256 Test Methods for Determining the Izod Pendulum Impact Resistance of PlasticsD257 Test Methods for DC Resistance or Conductance of Insulating MaterialsD570 Test Method for Water Absorption of
11、 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 and Reinforced Plastics
12、and Electrical Insulating MaterialsD792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by DisplacementD883 Terminology Relating to Plastics1 This classification system is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcom
13、mittee 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 2005 asD707 - 05.D707 - 09. DOI: 10.1520/D0707-09.10.1520/D0707-15.2 For referencedASTM standards, visit theASTM
14、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 standard and is intended only to provide the user of an ASTM standard an indic
15、ation 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 cases only the current versionof the standard as published by ASTM is to be co
16、nsidered 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 States1D1003 Test Method for Haze and Luminous Transmittance of Transparent PlasticsD1600 Termino
17、logy for Abbreviated 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 MaterialsD3892 Practice for Packaging/Packing of Plas
18、ticsD4000 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 for Computing the Colors of Ob
19、jects 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 CAB):4.1.1 Group 01High impact s
20、trength.4.1.2 Group 02High tensile strength.4.1.3 ClassAccording to plasticizer content and properties specified in Table CAB.4.1.4 Grade 1For injection molding (general purpose).4.1.5 Grade 2For extrusion.5. Suffixes5.1 When requirements are needed that are not covered in Table CAB they shall be in
21、dicated through the use of suffixes.5.2 A list of suffixes can be found in Classification 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
22、Color and opacity shall be within the limits defined in 6.3.5.4 Some of the more commonly used suffixes for cellulose acetate butyrate are shown as follows:E = electrical requirements as designated by the following digits:First Digit1 = volume resistivityTest Methods D257.dielectric strengthTest Met
23、hod 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 luminous transmittance determined in accordance with Proce-dure A of
24、 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 as follows:CAB0122FA053CAB = Table CAB property requirements.01 = Group 01high impact strength.2 = Class 2Plasticiz
25、er range from 12 to 23 % (see Table CAB, Footnote 1).2 = Grade 2Extrusion application.F053 = Flammability requirement from Classification System D4000Burn rate maximum of 50 mm/min with 3 mm minimumthickness, when tested in accordance with Test Method D635.NOTE 2“CAB0122” corresponds to the followin
26、g physical property requirements 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.3 The last approved version of this historical standard is refere
27、nced on www.astm.org.D707 1526. Materials and Manufacture6.1 Materials supplied in these forms shall be as uniform in composition and size, and as free of contamination as can beachieved by good manufacturing practice.6.2 If these materials contain colorants in the nominal amounts ordinarily employe
28、d, such additives shall not alter the abilityof 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 standard samplesprepared by the manufacturer.7. Physical Requirements7.1 Test specimens of the ma
29、terial shall conform to the requirements prescribed in Table CAB.7.2 Molded specimens, for 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 Sa
30、mpling shall be statistically adequate to satisfy the requirements of 12.4.8.2 A batch or 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
31、to properties designated in Table CAB of this classification system.9.2 One set of samples 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 classif
32、ication system.10. Specimen Preparation10.1 Physical property requirements in Table CAB are based on injection-molded specimens 3.2 mm thick. Specimensmachined from compression-molded blanks or extruded strips can be used, provided it can be shown that the results arecomparable.10.2 Prior to molding
33、 cellulose acetate butyrate, dry the material to a moisture content of 0.2 % or less. The primary reason fordrying the material is to eliminate visual defects such as surface imperfections and bubbles. Material spread in a tray to a maximumdepth of 50 mm and exposed in a circulating-air oven at 75 t
34、o 90C for 3 h is recommended. Formulations containing either verylow or very high levels of plasticizer can require slightly higher or lower drying temperatures respectively. Control the injectionmolding cycles in accordance with Practice D3641, using a material temperature of 25 to 35C above the “c
35、old point.” (The “coldpoint” is the lowest material temperature at which it is possible to obtain a full shot when all other operating variables are heldconstant within the normal operating range.) Mold temperatures between 35 and 60C have been found desirable. As a rule,thin-section moldings and hi
36、gher hardness materials (lower plasticizer content) require higher mold temperatures.10.3 Test specimens injection 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
37、. A gate size 1.5 mm square has been foundto produce satisfactory test specimens.11. Test Methods11.1 Determine 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 P
38、ractice D618.11.1.2 Test specimens shall be conditioned in accordance with Procedure A of Practice D618.11.1.3 Color-VisualPractice D172911.1.4 Color-QuantitativePractice E30811.1.5 Plasticizer ContentThe test method for plasticizer content shall be specified.11.1.6 Specific GravityTest Methods D792
39、.11.1.7 Tensile Stress at YieldTest Method D638, Type I test 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 Test Method D256. Specimen size: 63.5 mm long by 12.7 mm wide by 3.2mm thick.11.1.10 Water
40、AbsorptionTest Method D570, 24-h immersion.NOTE 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 the primaryspecimen type is not available. Condition in accordance with Test Method D570.D707 15311.1.11 Weight Loss on Heatin
41、gCondition 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 calcium 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
42、primaryspecimen type is not available. Weigh three specimens and place them in a circulating-air oven for 72 h at 82 6 2C. Support 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 thespecim
43、ens and calculate the weight loss on heating as a percentage of the conditioned weight as follows:weight loss on heating,%5W12W2!W13100 (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 certi
44、fication 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 lot is made. The lot-acceptanceinspection sha
45、ll consist of plasticizer content determination (see Table CAB, Footnote 1) and color as specified in 6.3.12.3 Periodic 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. Inspe
46、ction frequency shall be adequate to ensure that the material iscertifiable in accordance with 12.4.12.4 Certification 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 val
47、ues for the lot meet the requirements of the classificationsystem (line call out).12.5 Areport of test results shall 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 pe
48、rcent by weight of recycled plastic, as definedin Guide D7209, if requested.NOTE 5TheASTM publication Manual on Presentation 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
49、that fails to conform to the requirements of this classification system is not to be 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; plasticized; recycled; specificationD707 154TABLE CAB Detailed Physical Property RequirementsMaterial: CAB(Cellulose Acetate Butyrate) SpecificGravity,TestMethodsD792TensileStress atYield, TestMethodD638, min,MPaFlexuralModulus,TestMethods
