GB/T 2423.23-2013Environmental testing - Part 2: Test methods - Test Q: Sealing (English PDF)

Foreword

This part is part 23 of GB/T 2423.The compositions of the GB/T 2423 standard

are shown in the informative appendix NA.

This part was drafted in accordance with GB/T 1.1-2009.

This part replaces GB/T 2423.23-1995 "Environmental testing for electric and

electronic products - Test Q. sealing".

Compared with GB/T 2423.23-1995, the main changes in this Part are as

follows.

- In accordance with the provisions of GB/T 1.1-2009, MODIFY the format;

- CHANGE term "this standard" in the original standard into "this Part";

- In keeping consistency with IEC 60068-2-17.1994, CHANGE the "4

Overview" of the original standard into "Introduction"; MAKE textual editing

and amendments;

- DELETE the "additional description" in the original standard. ADD the

"Foreword" of this Part;

- In keeping consistency with IEC 60068-2-17.1994, ADD the branch test Qy

of the sealing test series, which mainly includes the test Qy branch in Figure

1 of this Part, the "Test Qy. Pressurized seal test" in Chapter 11, Appendix

H (Informative) -- Test Qy -- Guidelines";

- MODIFY the chapter names, from the "Subject content and scope of

application" in the original standard into the "Scope", from the "Normative

standards" in the original standard into "Normative references", from the

"Terms" in the original standard into "Terms and definitions";

- ADD introduction for "Normative references" and "Terms and definitions";

- MODIFY the editorial errors in "Terms and definitions"; CHANGE the

"leakge" into "leakage";

- ADD the title of Figure 1, as well as the title of Table 3 and Table 4;

- CHANGE the "anti-repeated immersion" in Table 2 into "anti-continuous

immersion";

- In 3.5, CHANGE "For this test" into "For this Part";

- To be consistent with IEC 60068-2-17.1994, ADD the "Note. Used for

testing Qm" to 3.9 ~ 3.12 of the "Terms and definitions";

- CHANGE the "Pressurized" in "5.3 Description" of the original standard into

"Had been pressurized" in 4.3 of this Part;

- CHANGE the contents of the suspension paragraph of 6.3 and 6.6 of the

original standard, into the clause of "Experiment summary"; the original

subordinate label of each section is postponed in turn;

- In keeping consistency with IEC 60068-2-17.1994, DELETE the content of

the suspended paragraphs 6.4 and 6.5 of the original standard;

- In keeping consistency with IEC 60068-2-17.1994, CHANGE the Table 3

"immersion time" into "minimum immersion time";

- MODIFY the "dehumidifying water" in 8.5.1 of the original standard into

"water with low surface tension" in 7.5.1 of this Part;

- MODIFY the "Initial inspection" and "De-wetting agent" in 8.8 of the original

standard into "Initial inspection of electrical and mechanical properties" and

"Wetting agent" in 7.8 of this Part;

- MODIFY the "Unacceptable interfering signals" in 9.4.6 of the original

standard into "Unacceptable interfering signals" in 8.4.6 of this Part;

- In the A2 of the original standard, CHANGE the "Compress the air in the

test chamber to" into "...pressurized to"; CHANGE "The result can use cubic

centimeters per hour" into "... cubic centimeters per hour";

- In Note 1 to the D1 of the original standard, CHANGE "...approximately

equal to 10-5 Pa" into "...approximately equal to 105 Pa";

- In the Appendix A ~ Appendix H, CHANGE from the original "Supplements"

into "Informative appendixes".

This Part, through the translation method, identically adopts the IEC 60068-2-

1 Scope

This part of GB/T 2423 specifies various sealing performance test methods.

Test Qa and Qc are rough inspections, to observe the bubbles emerging from

the leak. Test Qd is to observe the leakage of liquid, under heating conditions.

2 Normative references

The following documents are essential to the application of this document. For

the dated documents, only the versions with the dates indicated are applicable

to this document; for the undated documents, only the latest version (including

all the amendments) is applicable to this standard.

3 Terms and definitions

The following terms and definitions apply to this document.

Leak rate under standard temperature and differential pressure conditions.

The standard temperature of this Part is 25 °C. The standard pressure

difference is 105 Pa (1 bar).

4 Test Qa. Bushing, mandrel, gasket seal

Install the test sample on the lid of the test box, which is immersed in the liquid,

under pressure. If the sample leaks, the air that escapes through the leak will

be collected. The measurement of the amount of air leakage is expressed by

the amount of air, which is collected per unit time. The corresponding test

equipment is as shown in Appendix A.

5 Test Qc. Sealing of container (gas leakage)

The test sample is immersed in a suitable liquid. Under controlled conditions,

by observing the bubbles released on the surface of the test sample, check the

gross leaks (see B.5).

The method consists of two steps.

6 Test Qd. Sealing of container (liquid leakage)

This test is used to test the test sample, which may leak, when the temperature

is slightly higher than the maximum working temperature of the test sample.

7 Test Qf. water immersion

According to relevant specifications, carry out the electrical and mechanical

performance measurement and appearance inspection of test samples. All

sealing parts shall be inspected, to make sure that their installation is correct.

When this test is included in the relevant specifications, specific provisions shall

be made for the following items.

8 Test Qk. Tracer gas method with mass spectrometer

Test method 1 is mainly used for small-volume samples (see Table 5). Unless

properly processed before detection, the surface of the sample shall not absorb

too much helium to affect the test results (such as braids, solder joints, organic

materials, paint, etc.).

9 Test Ql. Pressurized immersion test

The main point of this method is to allow a test liquid to penetrate into the

sample under test, through the leak. This method is usually called the

pressurized immersion test.

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