Background Statement for SEMI Draft Document 5371
New Standard: Test Method for Tensile Strength Applied to Welded
Connections Made by PFA Weld Fitting.
Notice: This background statement is not part of the balloted item. It is provided solely to assist the recipient in
reaching an informed decision based on the rationale of the activity that preceded the creation of this Document.
Notice: Recipients of this Document are invited to submit, with their comments, notification of any relevant
patented technology or copyrighted items of which they are aware and to provide supporting documentation. In this
context, “patented technology” is defined as technology for which a patent has issued or has been applied for. In the
latter case, only publicly available information on the contents of the patent application is to be provided.
Background Statement
Welding fitting connections made of PFA are used in the semiconductor manufacture in recent years.
The standard of the test method and the specification for welding fitting connections is requested.
We developed a standard for the test method for tensile strength applied to welded connections made by PFA weld
fitting.
The voting results of this ballot will be reviewed by the Welding Fitting Task Force, and will be adjudicated by the
Japan Liquid Chemicals Committee at their meeting scheduled on Friday, April 5, 2013 at SEMI Japan, Tokyo,
Japan.
If you have any questions on this ballot, please contact the following Task Force leaders or SEMI Staff:
Welding Fitting Task Force co-leaders:
Kimihito Sasao (Advance Electric Company) at k.sasao@advance-e.co.jp
Takashi Hasegawa (KITZ SCT) at t.hasegawa@kitz-sct.co.jp
SEMI Staff
Naoko Tejima (SEMI Japan) at ntejima@semi.org
Semiconductor Equipment and Materials International
3081 Zanker Road
San Jose, CA 95134-2127
Phone: 408.943.6900, Fax: 408.943.7943
SEMI Draft Document 5371
New Standard: Test Method for Tensile Strength Applied to Welded
Connections Made by PFA Weld Fitting.
1 Purpose
1.1 This method provides a uniform procedure to determine the tensile strength applied to welded connections made
by PFA weld fitting.
2 Scope
2.1 This method can be used to characterize welded connections on the basis of test data developed under the
conditions described herein, but the results are not intended to imply a performance rating.
2.2 Tube defined in this method has a circular cross section and is made of PFA.
2.3 Welded connections tested by this method are made by PFA weld fitting.
2.4 The seal between the tube and the welded fitting and between the welded fitting and the welded fitting is within
the scope of this document. All other, threaded seals are beyond the scope of this document.
2.5 When using this method for making comparisons among various welded fitting designs and manufacturers, the
user must be specific in the selection of the tube and welded fitting s to be evaluated.
2.6 The International System of Units (SI) is used as the standard unit of measure in this document. The U.S.
Customary units are in parentheses for reference purposes only and have been rounded to the nearest whole value.
NOTICE: SEMI Standards and Safety Guidelines do not purport to address all safety issues associated with their
use. It is the responsibility of the users of the Documents to establish appropriate safety and health practices, and
determine the applicability of regulatory or other limitations prior to use.
3 Referenced Standards and Documents
3.1 ASTM Standards1
ASTM D3307 PFA  Fluorocarbon Molding and Extrusion Materials
4 Summary of Method
4.1 Subject welded connections made by PFA weld fitting to extreme tensile forces.
5 Significance and Use
5.1 In the manufacturing of semiconductor products, many types of hazardous chemicals and solvents are required.
As a result, tubing and various welded connections made by PFA weld fitting (which are chemically resistant to
these fluids) are used to transport those fluids. It is important to control the testing process when evaluating various
fitting designs, so that comparisons of the tensile strength can be made.
5.2 It is the intent of this method to provide a procedure in which the tensile force will be applied to welded
connections made by PFA weld fitting. By using this method, comparisons of various welded connection designs
can be achieved.
5.3 The results obtained when using this method are applicable only to conditions that specifically duplicate the
procedures used within this method.
5.4 When using this test method, it is assumed that the test specimens are truly representative of the material and
manufacturing process specified for that product. Departure from this assumption could introduce discrepancies that
are greater than those introduced by departure from the details of the procedure outlined in this method.
6 Terminology
6.1 characterize — to describe the quality of.
This is a Draft Document of the SEMI International Standards program. No material on this page is to be construed as an official or adopted Standard or Safety Guideline.
Permission is granted to reproduce and/or distribute this document, in whole or in part, only within the scope of SEMI International Standards committee (document
development) activity. All other reproduction and/or distribution without the prior written consent of SEMI is prohibited.
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6.2 failure — tube separation from a welded connection or tearing of the tube.
6.3 subject — to expose to.
6.4 tensile — longitudinal, so as to lengthen the test object.
7 Description of Test Equipment
7.1 A test apparatus capable of securing the test specimen while accurately providing a uniform rate of pull to the
specimen. The test instrument shall have the capability of recording the maximum tensile force applied to the test
specimen.
7.2 See Figure 1 for basic tensile test apparatus.
FITTING
TENSILE FIXTURE
WELDED
CONNECTION
FITTING
WELDED
CONNECTION
100mm
(minimum)
TUBE
TENSILE FIXTURE
TENSILE FIXTURE
WELDED
CONNECTION
FITTING
TENSILE FIXTURE
FITTING
Figure 1
/
2
Basic Tensile Test Apparatus
8 Safety Precautions
WARNING: This test method will subject test specimens to conditions that may exceed the normal performance
rating of the products under evaluation. Adequate precautions must be taken to prevent injury to the person
conducting the test.
9 Test Specimens and Conditioning
9.1 Sample Size  A minimum of three specimens shall be tested.
9.2 Specimen Size  The case with tensile strength test of welded connection of the fitting and the tube : leaving a
minimum of 100mm (4 in.) of exposed tube. (see Figure 1.)
9.3 Specimen Surface  All surfaces of the specimens shall be free of visible flaws, scratches, or other
imperfections, unless typically found on a representative sample of the product.
9.4 Specimen Conditioning  All specimens must be conditioned for a minimum of one hour in an air environment
of 23 ± 2.8C (73 ± 5F) prior to being subjected to tensile forces.
10 Calibration
10.1 Calibrate the tensile test equipment's rate of pull to 25mm (1 in.) per minute, ±5%.
10.2 Calibrate the tensile force instrument to ±2% full scale.
This is a Draft Document of the SEMI International Standards program. No material on this page is to be construed as an official or adopted Standard or Safety Guideline.
Permission is granted to reproduce and/or distribute this document, in whole or in part, only within the scope of SEMI International Standards committee (document
development) activity. All other reproduction and/or distribution without the prior written consent of SEMI is prohibited.
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Document Number: 5371
Date: 2/8/2016
Semiconductor Equipment and Materials International
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Phone: 408.943.6900, Fax: 408.943.7943
11 Test Procedure
11.1 Assemble a test fitting connection, per manufacturer's specification, to one end of the tube. (see Figure 1 2.)
11.2 Install the fitting connection to the tensile fixture (see Figure 1 2.) in a manner that prevents distortion of the
connection.
11.3 Begin pulling the test specimen at a rate of 25mm (1 in.) per minute.
11.4 Continue applying tensile force until tearing of the welded connection or until tearing of the tube occurs.
11.4.1 If the tube releases from the tensile fixture, the data from that specimen must be disregarded and an additional
specimen tested.
11.5 Record on test data sheet (see Appendix 1 for a sample) the mode of failure and the maximum tensile force
applied, in Newtons (lbs.).
12 Calculations
12.1 Calculate the average “maximum tensile force” and record.
12.2 Calculate the standard deviation of “maximum tensile force” and record.
13 Data Accuracy
13.1 Tensile Force  Newtons: ±2%
14 Test Data Sheet
14.1 The test data sheet shall include the following information:
14.1.1 Date tested
14.1.2 Operator and test facility
14.1.3 Description of items tested, including:
 Tubing — Manufacturer, O.D., wall thickness, part number, and material type
 Fitting — Manufacturer, type, size, part number, and material type
14.1.4 Conditions of welding — Some examples are described in the following. Decide appropriate items referring
to examples, and record those items.
 Model code and manufacturer name of welding machine
 Preset temperature of heater
 Heating time
 Amount of overlap
 Cooling-down time
 Parameters of welding machine
 Other data necessary for reproduction
14.1.5 Maximum tensile force for each specimen.
14.1.6 Average and standard deviation of maximum tensile forces.
14.1.7 Mode of failure for each specimen.
NOTE 1: A sample test data sheet is provided as Appendix 1.
This is a Draft Document of the SEMI International Standards program. No material on this page is to be construed as an official or adopted Standard or Safety Guideline.
Permission is granted to reproduce and/or distribute this document, in whole or in part, only within the scope of SEMI International Standards committee (document
development) activity. All other reproduction and/or distribution without the prior written consent of SEMI is prohibited.
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Document Number: 5371
Date: 2/8/2016
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Phone: 408.943.6900, Fax: 408.943.7943
APPENDIX 1
SAMPLE TEST DATA SHEET
NOTICE: The material in this Appendix is an official part of SEMI [designation number] and was approved by full
letter ballot procedures on [A&R approval date].
Test Date:
Operator:
Test Facility:
Tube Manufacturer:
Fitting Manufacturer:
Tube O.D.:
Fitting Type(Brand):
Tube Wall Thickness:
Fitting Size:
Tube P/N:
Fitting P/N:
Tube Material:
Fitting Material:
Tensile Force  Newtons
Sample
Maximum Tensile Force
Mode of Failure
1
2
3
Average =
Standard Deviation =
NOTICE: Semiconductor Equipment and Materials International (SEMI) makes no warranties or representations as
to the suitability of the Standards and Safety Guidelines set forth herein for any particular application. The
determination of the suitability of the Standard or Safety Guideline is solely the responsibility of the user. Users are
cautioned to refer to manufacturer’s instructions, product labels, product data sheets, and other relevant literature,
respecting any materials or equipment mentioned herein. Standards and Safety Guidelines are subject to change
without notice.
By publication of this Standard or Safety Guideline, SEMI takes no position respecting the validity of any patent
rights or copyrights asserted in connection with any items mentioned in this Standard or Safety Guideline. Users of
this Standard or Safety Guideline are expressly advised that determination of any such patent rights or copyrights,
and the risk of infringement of such rights are entirely their own responsibility.
This is a Draft Document of the SEMI International Standards program. No material on this page is to be construed as an official or adopted Standard or Safety Guideline.
Permission is granted to reproduce and/or distribute this document, in whole or in part, only within the scope of SEMI International Standards committee (document
development) activity. All other reproduction and/or distribution without the prior written consent of SEMI is prohibited.
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Document Number: 5371
Date: 2/8/2016