ASTM D6265-09
(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
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 If desired, materials isolated on a wire mesh filter can subsequently 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 the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health 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 practice.
General Information
Relations
Buy Standard
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D6265 − 09
StandardPractice 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* D1600 Terminology forAbbreviatedTerms Relating to Plas-
tics
1.1 This practice covers a means to separate the unmolten
D7209 Guide for Waste Reduction, Resource Recovery, and
particles,gels,andimpuritiescontaminatingapolymersample.
Use of Recycled Polymeric Materials and Products
The procedure may be used to remove gels and incompatible
IEEE/ASTM SI-10 Practice for Use of the International
materials that may cause imperfections in the final extruded
System of Units (SI) (the Modernized Metric System)
product.Underpressure,mostgelswillbreakupordeformand
passthroughawiremeshfilter,howeverhighmolecularweight
3. Terminology
gels may not break up or deform.
3.1 The terminology used in this practice is in accordance
1.2 If desired, materials isolated on a wire mesh filter can
withTerminologyD1600andGuideD7209.Unitsandsymbols
subsequently be identified by spectroscopic or other analytical
are in accordance with Practice IEEE/ASTM SI-10.
means.
NOTE 1—Although not presented as a quantitative method, the proce- 4. Summary of Practice
dure presented in this practice may be used to provide quantitative results
4.1 This practice determines the relative contamination
at the discretion of the user. The user assumes the responsibility to verify
level that can cause undesirable imperfections in the extruded
the reproducibility of quantitative results. Detection limit depends on the
mesh size of the filter screen, but the procedure is generally applicable to product due to contaminants and gels.Although this practice is
the separation of immiscible contaminants present at concentrations
not designed to provide an absolute measurement of contami-
greater than 0.1 %.
nation level, using appropriate criteria, the rate of this pressure
1.3 The values stated in SI units are to be regarded as
rise can be correlated to the relative contamination level.
standard.
5. Significance and Use
1.4 This standard does not purport to address the safety
concerns, if any, associated with its use. It is the responsibility
5.1 Problems with extrusion and subsequent processing of
of the user of this standard to establish appropriate safety and
thematerialarecaused,inpart,bythepresenceofpaper,metal,
health practices and determine the applicability of regulatory
gels, incompatible polymers, or other extraneous contamina-
limitations prior to use. For specific hazards statements, see
tion found in polymers.
Section 8.
6. Apparatus
NOTE 2—There is no known ISO equivalent to this practice.
6.1 Extruder, designed to deliver a continuous supply of
molten resin to a filter at a uniform rate with good temperature
2. Referenced Documents
2 control. Extruders with 18 to 64-mm diameters have been
2.1 ASTM Standards:
found to be satisfactory.
D1238 Test Method for Melt Flow Rates of Thermoplastics
6.1.1 Internal Rod Die, to fix the filter area. Fig. 1 shows a
by Extrusion Plastometer
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-
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
ration is shown in Fig. 2.
and is the direct responsibility of Subcommittee D20.95 on Recycled Plastics.
6.1.3 Pressure Transducer, installed in-line before the
Current edition approved Sept. 1, 2009. Published September 2009. Originally
screen pack and connected to digital readout and a chart
approved in 1998. Last previous edition approved in 2003 as D6265 - 98(2003).
DOI: 10.1520/D6265-09.
recorder.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.1.4 Melt Thermocouple, installed before or after the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
screen pack and connected to a chart recorder.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 6.1.5 High Pressure Alarm and Rupture Disk.
*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 − 09
6.6 Thermally Insulated Gloves.
6.7 Spatulas and Scrapers, brass, assorted sizes for remov-
ing molten polymer from equipment.
7. Materials
7.1 Virgin Polymer, free of gels and contaminants, for
purging the extruder equipmen
...
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:D6265–98 (Reapproved 2003) Designation:D6265–09
Standard Practice for
Separation of Contaminants in Polymers Using an Extruder
1
Filter Test
This standard is issued under the fixed designation D 6265; 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 If desired, materials isolated on a wire mesh filter can subsequently 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 the standard.
1.4 This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of the
user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations
prior to use. For specific hazards statements, see Section 8.
NOTE2—There is no equivalent ISO standard. 2—There is no known ISO equivalent to this practice.
2. Referenced Documents
2
2.1 ASTM Standards:
D 1238 Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plastometer
D 1600 Terminology for Abbreviated Terms Relating to Plastics
D5033Guide for the Development of Standards Relating to the Proper Use of Recycled Plastics 7209 Guide for Waste
Reduction, Resource Recovery, and Use of Recycled Polymeric Materials and Products
EI380EEE/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 D 1600 and Guide D5033D 7209. Units and
symbols are in accordance with Practice E380IEEE/ASTM SI-10.
4. Summary of Practice
2 2
4.1As polymer passes through a wire mesh filter of known area and porosity (for example, 0.00032 m [0.049 in. ]ofa325
mesh screen) positioned in line at the end of an extruder barrel, the filter becomes blocked by impurities and gels. This procedure
isusedtoremovegelsandcontaminantsthatmayresultinundesirableimperfectionsintheextrudedproduct.Thisblockageresults
in a proportional rise in the pressure behind the filter. Although this Practice is not designed to provide any quantitative estimate
of the level of contamination, the rate of this pressure rise may be correlated to the level of contamination through appropriate
experiments.
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 July 10, 2003.Sept. 1, 2009. Published September 2003.2009. Originally approved in 1998. Last previous edition approved in 19982003 as
D 6265 - 98(2003).
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. ForAnnualBookofASTMStandards
, Vol 08.01.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 ----------------------
D626
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.