ASTM D4894 PDF
D Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Standard + Redline PDF Bundle, 28, $, ADD TO CART . This standard is issued under the fixed designation D ; the number immediately 1 This specification is under the jurisdiction of ASTM Committee D20 on. Astm d - Download as PDF File .pdf), Text File .txt) or read online. PTFE.
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ASTM. Teflon® PTFE. Property. Method. Unit. Granular Resin. Fine Powder. Tensile Strength, 23°C (73°F). D/ MPa (psi). (4,). min. D Specification for Polytetrafluoroethylene (PTFE). Granular Molding and Ram Extrusion Materials5. E 94 Guide for Radiographic Tesling6. IEEE/ASTM Sl- . Buy ASTM D SPECIFICATION FOR POLYTETRAFLUOROETHYLENE (PTFE) GRANULAR MOLDING AND RAM EXTRUSION MATERIALS from.
These PTFE resins are homopolymers of tetrafluoroethylene, or, in some cases, modified homopolymers containing not more than one percent by weight of other fluoromonomers. The materials included herein do not include mixtures of PTFE resin with additives such as colorants, fillers or plasticizers; nor do they include reprocessed or reground resin or any fabricated articles.
Included are specimen preparation, test methods and requirements for materials, melting characteristics, bulk density, particle size, water content, standard specific gravity, thermal instability index, and mechanical tensile properties. This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application.
ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. The usual methods of processing thermoplastics generally are not applicable to these materials because of their viscoelastic properties at processing temperatures.
Resin that has been treated specification and sintered g.
Molding and 4. The system uses predefined cells to refer to specific for PTFE.
For this example, the line callout would be ASTM 3. Grade in the appropriate specified properties, Tables, or both, 3. In this case there is no Class item so the of a specimen of PTFE material molded as described in this cell position for class is left blank. A comma is used as the specification and sintered using the appropriate sintering separator between Standard Number and Type.
Separators are schedule given in this specification. An example would be in Specification heated for a prolonged period of time. When Special Notes are 4.
Classification used, they shall be preceded by a comma. B Extrusions of this resin show different degrees of clarity from the others.
Mechanical Properties plug height to allow the resin in the die can be leveled by 5. Insert the die in a suitable hydraulic the procedures specified herein.
Table 1 lists tests to be carried press and apply pressure gradually Note 3 until a total of Table 2 lists tests requiring specimens molded as MPa [ psi] is attained. Hold this pressure for 3 min.
Remove the disk identification on the disk at this time. NOTE 3—As a guide, increasing the pressure at a rate of 3. If they are not followed, the crystallinity of the disks and the resulting physical properties will be markedly changed. Therefore, the use of a programmed oven is recom- 8. Number of Tests mended for the most precise sintering cycle control so that the hood 8.
Periodic tests shall being an important safety consideration. One set of tests specimens as prescribed in Section 7 prepare the preforms. End plug clearances shall be sufficient to shall be considered sufficient for testing each sample.
The ensure escape of air during pressing. The test resin shall be near average of the results for the specimens tested shall conform to ambient temperature prior to molding Note 5.
NOTE 5—For maximum precision, the weighing and preforming opera- 9. These operations shall not be preformed at 9. The test resin shall be near ambient temperature prior to in sintered specimens and differences in specimen density as well as molding Note 5.
Re: ASTM D4894-Standard Specification for Polytetrafluoroethylene (PTFE) Granular Mol
Warning—PTFE can evolve small quanti- changes in other physical properties. Consequently, exhaust when the measurement is made using immersion procedures if a sensitive ventilation must be used whenever the resins are heated above thermometer for example, one reading Since the temperature of 9.
Break PTFE resins should ensure that tobacco is not contaminated. Condition the resin in the sealed glass electrical properties discussed in Appendix X1. After breaking up resin resin through a No.
Adjust the lower lumps, allow the sealed container to equilibrate to near ambient 3 FIG.
Then screen and weigh the Link to Active This link will always route to the current Active version of the standard. See Notes 1, 3 and 9 for specific cautionary statements.
The materials included herein do not aztm mixtures of PTFE resin with additives such as colorants, fillers or plasticizers; nor do they include reprocessed or reground resin or any fabricated articles. D Specification for Aqueous Dispersions of Polytetrafluoroethylene.
Included are specimen preparation, test methods and requirements for materials, melting characteristics, bulk density, particle size, water content, standard specific gravity, thermal instability index, and mechanical tensile properties.
Referenced Documents purchase separately The documents listed xstm are referenced within the subject standard but are not provided as part of the standard. The usual methods of processing thermoplastics generally are not applicable to these materials because of their astk properties at processing temperatures.
The materials included herein do not include mixtures of PTFE resin with additives such as colorants, fillers or plasticizers; nor do they include reprocessed or reground resin or any fabricated articles.West Conshohocken. Weigh the resin to the nearest 0. Where these lines intersect tests require no conditioning of the molded test specimens.
Pranay Kharbe. Terminology 4.
Historical Version s - view previous versions of standard. See Notes 3 and 9 for specific cautionary statements. Use the remainder of Section II to prepare tape specimens by skiving 0.
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