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ASTM D4745-19
Standard Classification System and Basis for Specification for Filled Polytetrafluoroethlyene (PTFE) Molding and Extrusion Materials Using ASTM Methods
NORMA vydaná dňa 1.5.2019
Informácie o norme:
Označenie normy: ASTM D4745-19
Dátum vydania normy: 1.5.2019
Kód tovaru: NS-951549
Počet strán: 6
Približná hmotnosť: 18 g (0.04 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM D4745-19 :
This specification covers polytetrafluoroethylene(PTFE) filled molding compounds made with virgin PTFE resins defined in a certain specification except Types I, IV, V, and VI. PTFE compounds are classified into two types which are Type I as the nonpelletized material use for general purpose compression molding and Type II as the pelletized or free-flowing material use for molding, automatic molding or ram extrusion. Each type is further classified into thirteen grades distinguished by the nature of the filler. Different tests shall be conducted in order to determine the following properties: filler content, bulk density, specific gravity, and tensile properties.
Keywords:
filled compounds, filled polytetrafluoroethylene, fluorocarbon polymers, fluoropolymer, fluoropolymer composites, polytetrafluoroethylene, PTFE,, ICS Number Code 83.140.99 (Other rubber and plastic products)
Doplňujúce informácie
| 1. Scope | ||||||||||||||
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1.1 This standard classification system and basis for specification covers polytetrafluoroethylene (PTFE) filled molding compounds made with virgin PTFE resins defined in Specification D4894, as Types II and III. Note 1: This system can be used as a model for other PTFE
compounds having particulate fillers that can survive the sintering
temperatures of PTFE as can those listed in this standard. This
system is restricted to virgin PTFE base resin for technical
reasons. Recycled or reprocessed material cannot be processed
successfully.
Note 2: The properties measured on commercially fabricated
parts may differ from the listed values for samples prepared by the
procedures given in this specification, depending on part geometry
and processing parameters. Compounds used for ram extrusion are
made from resins that comply with ASTM-D4745 Type II prior to their
pre-sintering process. Property values measured on extruded
products will vary from the listed values for Type II compounds
which are prepared by the procedures given below which standardize
mold diameter and sintering cycle. End users should assess these
expected variations in ram extruded products to ensure their
suitable use in their specific application.
1.2 The values stated in SI units are to be regarded as standard. 1.3 The following statement applies to the test method portion, Section 11, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Note 3: There is no known ISO equivalent to this standard. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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| 2. Referenced Documents | ||||||||||||||
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