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ASTM D4549-15(R2021) pdf free download

ASTM D4549-15(R2021) pdf free download.Standard Classification System and Basis for Specification for Polystyrene and Rubber-Modified Polystyrene Molding and Extrusion Materials (PS)
1. Scope
1.1 This classification system covers polystyrene materials, both crystal and rubber modified, suitable for molding and extrusion. 1.2 This classification system and subsequent line callout (specification) are intended to be a means of calling out plastic materials used in the fabrication of end items or parts. It is not intended for the selection of materials. Material selection can be made by those having expertise in the plastics field after careful consideration of the design and the performance required of the part, the environment to which it will be exposed, the fabrication process to be employed, the inherent properties of the material other than those covered by this specification, and the economics. 1.3 The properties included in this specification are those required to identify the compositions covered. Other require- ments necessary to identify particular characteristics important to specialized applications are to be specified using the suffixes as given in Section 5. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. N OTE 1—This standard combines elements from ISO 1622-1-2 and ISO 2897-1-2, but is not equivalent to either ISO standard. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
4. Classification
4.1 Polystyrene materials are classified into groups in ac- cordance with classes and grades as shown in the basic property table (Table PS). Injection molded properties are the preferred standard and are used for the basis of call out examples. N OTE 2—Since compression molded properties have been removed from the standard with this publication, refer to previous publications of this standard, if interested in these properties. N OTE 3—An example of this classification system for PS0111 is as follows: The designation PS0111 would indicate: PS = polystyrene as found in Terminology D1600, 01 (group) = crystal polystyrene, 1 (class) = general-purpose, and 1 (grade) = minimum-grade requirements as found in Table PS. 4.1.1 To facilitate the incorporation of future or special materials, the “other/unspecified” category (0) for group, class, and grade is shown in Table PS. The basic properties are obtained from Tables A or B as they apply (see 4.3). 4.2 Reinforced and filled polystyrene materials are classi- fied in accordance with Table PS and Table A. Table PS specifies unreinforced material and Table A the properties after addition of reinforcements or lubricants at the normal levels indicated (see 4.2.1). 4.2.1 Reinforcements and Additive Materials—A single let- ter will be used for the major reinforcement or combination, or both, along with two digits that indicate the percentage of addition by mass with the tolerances tabulated as follows:
13. Inspection and Certification
13.1 Inspection and certification of the material supplied with reference to a specification based on this classification system shall be for conformance to the requirements specified herein. 13.2 Lot-acceptance inspection shall be the basis on which acceptance or rejection of the lot is made. The lot-acceptance inspection shall consist of those tests which ensure process control during manufacture: melt flow rate and Izod impact. 13.3 Periodic check inspection with reference to a specifi- cation based upon this classification system shall consist of the tests for all requirements of the material under the specifica- tion. Inspection frequency shall be adequate to ensure the material is certifiable in accordance with 13.4. 13.4 Certification shall be that the material was manufac- tured by a process in statistical control, sampled, tested, and inspected in accordance with this classification system, and that the average values for the lot meet the requirements of the specification (line callout). N OTE 10—The ASTM publication Manual on Presentation ofData and Control Chart Analysis, 8th Edition, Catalog Number: MNL-8TH-EB, provides detailed information about statistical process control. 13.5 A report of the test results shall be furnished when requested. The report shall consist of results of the lot- acceptance inspection for the shipment and the results of the most recent periodic-check inspection.

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