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SEMI F7-92 © SEMI 19 92, 1999 2 7. Description of Test Equipment 7.1 A test apparatus capable of s ecuring the test specimen while accurately prov iding a uniform rate of pull to the specimen. T he test instrument shall …

SEMI F7-92 © SEMI 1992, 19991

SEMI F7-92 (Reapproved 0299)

TEST METHOD TO DETERMINE THE TENSILE STRENGTH OF TUBE

FITTING CONNECTIONS MADE OF FLUOROCARBON MATERIALS

This test method was technically reapproved by the Facilities Committee and is the direct responsibility of the

North American Facilities Committee. Current edition approved by the North American Regional Standards

Committee in October 1998. Initially available on www.semi.org February 1999; to be published February 1999.

Originally published in 1992.

1. Purpose

1.1 This method provides a uniform procedure to

determine the tensile strength of tube fitting

connections made of fluorocarbon materials.

2. Scope

2.1 This method can be used to characterize tube

fitting 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 fluorocarbon materials.

2.3 All parts of the tube fittings tested by this

method in contact with the internal fluid are made of

fluorocarbon materials.

2.3.1 Parts such as a nuts or grippers are not limited

to being made of a fluorocarbon material.

2.4 Only the seal between the tube and tube fitting

being evaluated 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 tube fittings and/or

manufacturers, the user must be specific in the

selection of the tube and tube fittings 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.

3. Referenced Documents

3.1 ASTM Standards

D3307 PFA



Fluorocarbon Molding and Extrusion

Materials

D3296



Standard Specification for FEP

Fluorocarbon Tube

1 American Society for Testing and Materials, 100 Barr Harbor

Drive, West Conshohoken, PA 19428-2959

4. Summary of Method

4.1 Subject tube fitting connections made of

fluorocarbon materials 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 fitting

designs of fluorocarbon materials (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 accurate 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

tube fitting connections made of fluorocarbon

materials. By using this method, accurate

comparisons of various tube fitting 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.

6.2 failure  Tube separation from a tube fitting

connection or tearing of the tube.

6.3 subject  To expose to.

6.4 tensile  Longitudinal, so as to lengthen the test

object.

SEMI F7-92 © SEMI 1992, 1999 2

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.

Figure 1

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 specimen length shall be

no less than 10 cm (4 in) between the tensile fixture

and the tube end of the fitting connection.

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 2.5 cm (1 in) per minute, ± 5%.

10.2 Calibrate the tensile force instrument to ± 2%

full scale.

11. Test Procedure

11.1 Assemble a test fitting connection, per

manufacturer's specification, to one end of the tube.

(See 9.2.)

11.2 Install the fitting connection to the tensile

fixture (see Figure 1) in a manner that prevents

distortion of the connection.

11.3 Secure the open end of the tube to the tensile

fixture, leaving a minimum of 10 cm (4 in) of

exposed tube.

11.4 Begin pulling the test specimen at a rate of 2.5

cm (1 in) per minute.

11.5 Continue applying tensile force until the tube

pulls through the fitting connection or until tearing of

the tube occurs.

11.5.1 If the tube releases from the tensile fixture,

the data from that specimen must be disregarded and

an additional specimen tested.

11.6 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

The test data sheet shall include the following

information:

14.1 Date tested.

14.2 Operator and test facility.

14.3 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.

14.4 Maximum tensile force for each specimen.

14.5 Average and standard deviation of maximum

tensile forces.

14.6 Mode of failure for each specimen.

NOTE: A sample test data sheet is provided as

Appendix 1.