1、Designation: D 6867 03Standard Specification forPerfluoroalkoxy (PFA)-Fluoropolymer Tubing1This standard is issued under the fixed designation D 6867; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A num
2、ber in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers tubing produced from PFAFluoropolymer resins which are cited in Specification D 3307.This document specifies tu
3、bing dimensional tolerances, tensileproperties and related electrical properties as noted in theappropriate tables when tested in accordance with the methodscited in this specification. This specification is for virginmaterial only and does not address recycled material, as it isnot appropriate for
4、PFA tubing.NOTE 1Abbreviations are in accordance with Terminology D 1600.NOTE 2There is no similar ISO standard.1.2 The values stated in SI units are to be regarded as thestandard. The values given in brackets are for information only.1.3 The following safety hazards caveat pertains only to thetest
5、methods portion, Section 7, of this specification. Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulato
6、ry require-ments prior to use.2. Referenced Documents2.1 ASTM Standards:D 618 Practice for Conditioning Plastics for Testing2D 792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by Displacement2D 883 Terminology Relating to Plastics2D 1600 Terminology for Abbreviated T
7、erms Relating toPlastics2D 1675 Test Method for Polytetrafluoroethylene Tubing3D 3307 Specification for Perfluoroalkoxy (PFA)-Fluorocarbon Molding and Extrusion Materials4D 4894 Specification for Polytetrafluoroethylene (PTFE)Granular Molding and Ram Extrusion Materials5IEEE/ASTM SI 10 Standard for
8、Use of the InternationalSystem of Units (SI): The Modern Metric System63. Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nology D 883 unless otherwise specified.3.1.1 lot, none continuous production run or a uniformblend of two or more production runs of one size sheet ormolded b
9、asic shape.4. Physical Requirements4.1 The tubing shall be made of PFA-fluoropolymer resinmeeting the requirements of Specification D 3307.4.2 The inside diameter and wall thickness and tolerances ofthe tubing shall be as shown in Table 1, when determined inaccordance with 7.1.3.1 and 7.1.3.2.4.3 Th
10、e specific gravity of the tubing shall be between 2.12and 2.17 inclusive when determined in accordance with 7.1.4.4.4 The tubing shall have a minimum tensile strength of10.0 MPa 1500 psi and a minimum elongation of 200 %when determined in accordance with 7.1.5.4.5 The tubing shall remain free from c
11、racks and exhibit nosplitting when tested for dimensional stability in accordancewith 7.1.6.5. Sampling5.1 Sampling shall be statistically adequate to satisfy therequirements of 8.2.6. Number of Tests and Retests6.1 One set of five test specimens shall be consideredsufficient for testing each batch.
12、 The average result of thespecimens tested shall conform to the requirements of thisspecification.7. Test Methods7.1 The properties enumerated in this specification shall bedetermined in accordance with the following methods.7.1.1 ConditioningCondition the test specimens at 23 62C 73.4 6 3.6F for a
13、period of at least 4 h prior to test. Ifthe test material has been exposed to temperatures below 20Cwithin 24 h prior to test, the conditioning shall be for at least24 h and as outlined in Practice D 618.1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct
14、 responsibility of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved July 10, 2003. Published August 2003.2Annual Book of ASTM Standards, Vol 08.01.3Annual Book of ASTM Standards, Vol 10.01.4Annual Book of ASTM Standards, Vol 08.02.5Annual Book of ASTM Standards, Vol 08.03.6Avai
15、lable from ASTM International Headquarters, 100 Barr Harbor Drive, POBox C700, West Conshohocken, PA 194282959.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.1.2 Test ConditionsConduct tests at the standard labo-ratory temperature
16、 of 23 6 2C 73.4 6 3.6F, in referee casesthe standard laboratory atmosphere including 50 6 5% RHshall apply.7.1.3 Dimensions and Tolerances:7.1.3.1 Inside DiameterDetermine the inside diameter inaccordance with Test Method D 1675, except that no individualmeasurements shall be allowed to exceed the
17、tolerancesspecified in Table 1.7.1.3.2 Wall ThicknessDetermine the wall thickness inaccordance with the procedures described in Test MethodD 1675, except that no individual measurements shall beallowed to exceed the tolerances specified in Table 1.7.1.4 Specific GravityDetermine the specific gravity
18、 inaccordance with Method A of Test Methods D 792. Add 2drops of wetting agent (liquid detergent) to the water in orderto reduce the surface tension and ensure complete wetting ofthe specimen.7.1.5 Tensile Strength and ElongationDetermine the ten-sile strength and elongation as specified in 7.1.5.1-
19、7.1.5.3 onfive transverse specimens, using a testing speed of 50.8 mm 2in./min. Average the test results for the longitudinal and thetransverse specimens separately. Discard specimens that breakin the jaws of the tension tester, and make new tests.7.1.5.1 Tubing Having an Inside Diameter of 15.9 mm0
20、.625 in. and OverDetermine the tensile strength andelongation in both the longitudinal and transverse directions inaccordance with Specification D 4894.7.1.5.2 Tubing Having an Inside Diameter less than 15.9mm 0.625 in. to 2.3 mm 0.090 in. InclusiveDetermine thetensile strength and elongation in the
21、 longitudinal direction inaccordance with Specification D 4894. For longitudinal speci-mens, slit the tubing parallel to the axis and flatten out, prior topunching out specimens.7.1.5.3 Tubing Having an Inside Diameter less than 2.3 mm0.090 in.Test specimens as filaments. Make nonsliptypeloop knots
22、in each end of the specimen so that there are 34.9mm 138 in. between the knots of the loops (see Fig. 1). Placeloops over the drum of a standard wire specimen holder in thetension-testing machine and pull in this position.7.1.6 Dimensional StabilityCut three specimens each 305mm 12 in. long, measure
23、d to the nearest 1.6 mm 116 in.Place the specimens in a circulating-air oven at 200 6 2C for3 h. Then remove the specimens from the oven and allow tocool to 23 6 2C 73.4 6 3.6F. Again measure the length tothe nearest 1.6 mm 116 in. Calculate the change in length asa percentage of the original length
24、.8. Inspection and Certification8.1 The tubing shall be visually and dimensionally in-spected to verify compliance with the requirements of thisspecification.8.2 For all products, the purchaser shall be furnished acertification that this lot is made from only virgin PFA and thatthe sample representi
25、ng each lot has been either tested orinspected as directed in this specification and the requirementshave been met. When specified in the purchase order orcontract, a report of the test results shall be furnished.TABLE 1 Dimensions and Tolerances for PFA-Fluorocarbon Tubing-Dimensions, mm in.Inside
26、Diameter Wall ThicknessNominal Inside Diameter,mm in.Inside Diameter Tolerance,mm in.Nominal Thickness,mm in.Thickness Tolerance,mm in.0 to 0.25 0.000 to 0.010 60.03 0.001 0 to 0.13 0.000 to 0.005 60.030 0.0010.26 to 0.50 0.011 to 0.020 60.05 0.002 0.14 to 0.30 0.006 to 0.012 60.050 0.0020.51 to 0.7
27、5 0.021 to 0.030 60.08 0.003 0.31 to 0.48 0.013 to 0.019 60.080 0.0030.76 to 2.54 0.031 to 0.100 60.10 0.004 0.49 to 0.74 0.020 to 0.029 60.100 0.0042.55 to 4.32 0.101 to 0.170 60.13 0.005 0.75 and 0.030 and 60.130 0.0054.33 to 6.35 0.171 to 0.250 60.15 0.0066.36 to 19.05 0.251 to 0.750 60.18 0.0071
28、9.06 to 25.39 0.751 to 0.999 60.25 0.01025.4 and 1.000 and 60.38 0.015FIG. 1 Tension Specimen for Tubing Less Than 2.29 mm 0.090 in.D68670329. Packaging and Package Marking9.1 PackagingThe material shall be packaged in standardcommercial containers so constructed as to ensure acceptanceby common or
29、other carrier for safe transportation at the lowestrate to the point of delivery, unless otherwise specified in thecontract or order.10. Keywords10.1 extruded material; fluoropolymers; fluoropolymer tub-ing; melt-processible fluorocarbon polymer; PFA extrudedtubing; polytetrafluoroethylene (TFE) cop
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33、Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D6867033
