ASTM D6265-17
(Practice)Standard Practice for Separation of Contaminants in Polymers Using an Extruder Filter Test
Standard Practice for Separation of Contaminants in Polymers Using an Extruder Filter Test
SIGNIFICANCE AND USE
5.1 Problems with extrusion and subsequent processing of the material are caused, in part, by the presence of paper, metal, gels, incompatible polymers, or other extraneous contamination found in polymers.
SCOPE
1.1 This practice covers a means to separate the unmolten particles, gels, and impurities contaminating a polymer sample. The procedure may be used to remove gels and incompatible materials that may cause imperfections in the final extruded product. Under pressure, most gels will break up or deform and pass through a wire mesh filter, however high molecular weight gels may not break up or deform.
1.2 Materials isolated on a wire mesh filter can be identified by spectroscopic or other analytical means.
Note 1: Although not presented as a quantitative method, the procedure presented in this practice may be used to provide quantitative results at the discretion of the user. The user assumes the responsibility to verify the reproducibility of quantitative results. Detection limit depends on the mesh size of the filter screen, but the procedure is generally applicable to the separation of immiscible contaminants present at concentrations greater than 0.1 %.
1.3 The values stated in SI units are to be regarded as standard.
1.4 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. For specific hazards statements, see Section 8
Note 2: There is no known ISO equivalent to this standard.
1.5 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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Designation: D6265 − 17
Standard Practice for
Separation of Contaminants in Polymers Using an Extruder
1
Filter Test
This standard is issued under the fixed designation D6265; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 2. Referenced Documents
2
1.1 This practice covers a means to separate the unmolten 2.1 ASTM Standards:
particles, gels, and impurities contaminating a polymer sample. D1238 Test Method for Melt Flow Rates of Thermoplastics
The procedure may be used to remove gels and incompatible by Extrusion Plastometer
materials that may cause imperfections in the final extruded D1600 Terminology for Abbreviated Terms Relating to Plas-
product. Under pressure, most gels will break up or deform and tics
pass through a wire mesh filter, however high molecular weight IEEE/ASTM SI-10 Practice for Use of the International
gels may not break up or deform. System of Units (SI) (the Modernized Metric System)
1.2 Materials isolated on a wire mesh filter can be identified
3. Terminology
by spectroscopic or other analytical means.
3.1 The terminology used in this practice is in accordance
NOTE 1—Although not presented as a quantitative method, the proce-
with Terminology D1600. Units and symbols are in accordance
dure presented in this practice may be used to provide quantitative results
with Practice IEEE/ASTM SI-10.
at the discretion of the user. The user assumes the responsibility to verify
the reproducibility of quantitative results. Detection limit depends on the
4. Summary of Practice
mesh size of the filter screen, but the procedure is generally applicable to
the separation of immiscible contaminants present at concentrations
4.1 This practice determines the relative contamination
greater than 0.1 %.
level that can cause undesirable imperfections in the extruded
1.3 The values stated in SI units are to be regarded as
product due to contaminants and gels. Although this practice is
standard.
not designed to provide an absolute measurement of contami-
nation level, using appropriate criteria, the rate of this pressure
1.4 This standard does not purport to address all of the
rise can be correlated to the relative contamination level.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Significance and Use
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use. 5.1 Problems with extrusion and subsequent processing of
the material are caused, in part, by the presence of paper, metal,
For specific hazards statements, see Section 8
gels, incompatible polymers, or other extraneous contamina-
NOTE 2—There is no known ISO equivalent to this standard.
tion found in polymers.
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard-
6. Apparatus
ization established in the Decision on Principles for the
6.1 Extruder, designed to deliver a continuous supply of
Development of International Standards, Guides and Recom-
molten resin to a filter at a uniform rate with good temperature
mendations issued by the World Trade Organization Technical
control. Extruders with 18 to 64-mm diameters have been
Barriers to Trade (TBT) Committee.
found to be satisfactory.
1
This test method is under the jurisdiction of ASTM Committee D20 on Plastics
2
and is the direct responsibility of Subcommittee D20.95 on Recycled Plastics. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Dec. 1, 2017. Published January 2018. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1998. Last previous edition approved in 2015 as D6265 - 15. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D6265-17. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D6265 − 17
6.1.1 Internal Rod Die, to fix the filter area. Fig. 1 shows a
typical 6.4 mm diameter die that gives a filter area of 12.45
2
mm .
6.1.2 Breaker Plate or Screen Holder—A typical configu-
ration is shown in Fig. 2.
6.1.3 Pressure Transducer, installed in-line before the
screen pack and connected to digital readout.
6.1.4 Melt Thermocouple, installed before or after the
screen pack.
6.1.5 High Pressure Alarm and Rupture Disk.
6.1.6 Split Clam
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it 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 version
of the standard as published by ASTM is to be considered the official document.
Designation: D6265 − 15 D6265 − 17
Standard Practice for
Separation of Contaminants in Polymers Using an Extruder
1
Filter Test
This standard is issued under the fixed designation D6265; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This practice covers a means to separate the unmolten particles, gels, and impurities contaminating a polymer sample. The
procedure may be used to remove gels and incompatible materials that may cause imperfections in the final extruded product.
Under pressure, most gels will break up or deform and pass through a wire mesh filter, however high molecular weight gels may
not break up or deform.
1.2 Materials isolated on a wire mesh filter can be identified by spectroscopic or other analytical means.
NOTE 1—Although not presented as a quantitative method, the procedure presented in this practice may be used to provide quantitative results at the
discretion of the user. The user assumes the responsibility to verify the reproducibility of quantitative results. Detection limit depends on the mesh size
of the filter screen, but the procedure is generally applicable to the separation of immiscible contaminants present at concentrations greater than 0.1 %.
1.3 The values stated in SI units are to be regarded as standard.
1.4 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use. For specific hazards statements, see Section 8.
NOTE 2—There is no known ISO equivalent to this standard.
NOTE 2—There is no known ISO equivalent to this standard.
1.5 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D1238 Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plastometer
D1600 Terminology for Abbreviated Terms Relating to Plastics
D7209 Guide for Waste Reduction, Resource Recovery, and Use of Recycled Polymeric Materials and Products (Withdrawn
3
2015)
IEEE/ASTM SI-10 Practice for Use of the International System of Units (SI) (the Modernized Metric System)
3. Terminology
3.1 The terminology used in this practice is in accordance with Terminology D1600 and Guide D7209. Units and symbols are
in accordance with Practice IEEE/ASTM SI-10.
4. Summary of Practice
4.1 This practice determines the relative contamination level that can cause undesirable imperfections in the extruded product
due to contaminants and gels. Although this practice is not designed to provide an absolute measurement of contamination level,
using appropriate criteria, the rate of this pressure rise can be correlated to the relative contamination level.
1
This test method is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.95 on Recycled Plastics.
Current edition approved Oct. 1, 2015Dec. 1, 2017. Published October 2015January 2018. Originally approved in 1998. Last previous edition approved in 20092015 as
D6265 - 09.D6265 - 15. DOI: 10.1520/D6265-15.10.1520/D6265-17.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D6265 − 17
5. Significance and Use
5.1 Problems with extrusion and subsequent processing of the material are caused, in part, by the presence of paper, metal, gels,
incompatible polymers, or other extraneous contamination found in polymers.
6. Apparatus
6.1 Extruder, designed to deliver a continuous supply of molten resin to a filter at a uniform rate with good temperat
...
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