1、 EIA STANDARD TP-111A Determining the Total Ionic Contamination Test Procedure for Electrical Connectors, Socket Assemblies, or Components EIA-364-111A (Revision of EIA-364-111) September 2015 Electronic Components Industry Association EIA-364-111A ANSI/EIA-364-111A-2015 Approved: September 3, 2015
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5、 not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard or Publication. This EIA Standard is considered to have International Standardization implications, but the International Electrotechnical Commission activity has not progressed
6、 to the point where a valid comparison between the EIA Standard and the IEC document can be made. This Standard does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish approp
7、riate safety and health practices and to determine the applicability of regulatory limitations before its use. (From Standards Proposal No. 5347.05 formulated under the cognizance of the CE-2.0 Committee on EIA National Connector and Sockets Standards.) Published by Electronic Components Industry As
8、sociation 2015 EIA Standards & Technology Department 2214 Rock Hill Road, Suite 265 Herndon, VA 20170 PLEASE ! DONT VIOLATE THE LAW! This document is copyrighted by the ECIA and may not be reproduced without permission. Organizations may obtain permission to reproduce a limited number of copies thro
9、ugh entering into a license agreement. For information, contact: IHS 15 Inverness Way East Englewood, CO 80112-5704 or call USA and Canada (1-877-413-5186), International (303-397-7956) i CONTENTS Clause Page 1 Introduction . 1 1.1 Scope . 1 1.1.1 Method A, Ionography 1 1.1.2 Method B, Ion chromatog
10、raphy 1 1.2 Object 1 1.3 Definitions . 1 2 Test resources 2 2.1 Equipment . 2 2.1.1 Method A, Ionography 2 2.1.2 Method B, Ion chromatography 3 2.2 Material . 3 2.2.1 Method A, Ionography 3 2.2.2 Method B, Ion chromatography 3 3 Test specimen 4 3.1 Description 4 3.2 Preparation 4 4. Test procedure .
11、 4 4.1 Method A, Ionography 4 4.2 Method B, Ion chromatography 6 5 Details to be specified . 9 6 Test documentation . 9 Table 1 Common ions of interest . 8 ii (This page left blank) EIA-364-111A Page 1 TEST PROCEDURE No. 111A DETERMINING IONIC CONTAMINATION TEST PROCEDURE FOR ELECTRICAL CONNECTORS,
12、SOCKET ASSEMBLIES, OR COMPONENTS (From EIA Standards Proposal No. 5347.05, formulated under the cognizance EIA CE-2.0 Committee on National Connector and Socket Standards, and previously published in EIA-364-111.) 1 Introduction 1.1 Scope This standard establishes 2 methods for determining the total
13、 amount of extractable ionic contamination on the surface of an electrical connector or socket assembly or component. 1.1.1 Method A, Ionography A test method for quantifying the extractable ionic contamination on the surface of an electrical connector or socket assembly or component using an ionogr
14、aph contamination measurement system as determined in sodium chloride (NaCl) equivalents. 1.1.2 Method B, Ion chromatography A test method for quantifying and identifying the extractable ionic species on the surface of an electrical connector or socket assembly or component using an ion chromatograp
15、h system. Ion chromatography results are reported in parts per million of ionic species. 1.2 Object The object of this test procedure is to determine the amount of ionic contamination that may be present on the surface of a connector or socket assembly or component (either plastic or metallic). The
16、source of the contamination may be in the materials of construction or in residues from manufacturing processes. If excessive, the reliability of electronic equipment utilizing the connector or socket assembly or component may be compromised. 1.3 Definitions 1.3.1 Total ionic contamination Soluble i
17、onic species such as inorganic salts or weak organic acids EIA-364-111A Page 2 1.3.2 Connector or socket assembly Functional part consisting of conjoined components. 1.3.3 Connector or socket component Individual piece of an assembly such as a housing, a contact, a shield, a guide pin, a retention d
18、evice, or other miscellaneous hardware. 1.3.4 Baseline Line where the test starts 1.3.5 NaCl equivalents Units of concentration of a species reported based on the equivalent weight of NaCl 1.3.6 Eluent The solvent used to carry the extracted ions through the ion exchange chromatograph 1.3.7 Diluent
19、Solvent used for dilutions 1.3.8 Column Analytical exchanger used in ion chromatography to separate ionic species 2 Test resources 2.1 Equipment The following equipment is required: 2.1.1 Method A, Ionography 2.1.1.1 Ionograph contamination measurement system with a temperature compensated conductiv
20、ity sensor capable of measuring 0.2 g/ml of NaCl 2.1.1.2 Analytical balance (with a resolution of 0.5 milligrams) 2.1.1.3 Miscellaneous glass or plastic ware EIA-364-111A Page 3 2.1.1.4 Clean gloves or forceps 2.1.1.5 Hydrometer suitable of measuring a specific gravity of 0.855 0.0005 2.1.1.6 Microp
21、ipettes or Class A pipettes, capable of measuring 1 milliliter and 5 milliliters 2.1.1.7 Class A one-liter volumetric flasks 2.1.2 Method B, Ion chromatography A person with experience in ion chromatography should perform this procedure. 2.1.2.1 Ion chromatograph (IC) 2.1.2.2 Analytical columns (cap
22、able of resolving ions of interest) 2.1.2.3 Analytical balance (capable of milligram measurement) 2.1.2.4 Miscellaneous clean glass or plastic ware 2.1.2.5 Clean gloves or forceps 2.1.2.6 Unused, sealable, plastic bags capable of temperatures of 80 C 5 C 2.1.2.7 Water bath (capable of maintaining a
23、constant temperature of 80 C 5 C) 2.2 Material 2.2.1 Method A, Ionography 2.2.1.1 Isopropanol, reagent grade (IPA) 2.2.1.2 Deionized water (DI water) 2.2.1.3 Sodium chloride (NaCl), reagent grade, 750 micrograms per liter (ppm) recommended 2.2.2 Method B, Ion chromatography 2.2.2.1 Aqueous buffer so
24、lutions recommended for each column used for ionic separation 2.2.2.2 Certified standards for ions to be tested 2.2.2.3 Isopropanol, reagent grade (IPA) 2.2.2.4 Deionized water (DI water) EIA-364-111A Page 4 3 Test specimen 3.1 Description Connector or socket assembly or component 3.2 Preparation CA
25、UTION Use clean gloves or forceps when handling test specimens and clean glass or plastic ware to contain solutions. 4 Test procedure 4.1 Method A, Ionography 4.1.1. Set-up the ionograph following the manufacturers recommendations. 4.1.2 Prepare or buy the extraction solution of 75% / 25% 2% volume
26、/ volume isopropanol to DI water. Add the solution to the test chamber. 4.1.2.1 The concentration of this solution shall be maintained by checking its specific gravity using a hydrometer and making any necessary adjustment to the concentration. The specific gravity shall be 0.872 0.838. 4.1.3 Prepar
27、e or buy a 750 ppm NaCl standard to use as a calibration solution. 4.1.3.1 Follow the following procedures to prepare the calibration solution. 4.1.3.1.1 Dry a minimum of 2 grams of NaCl at 110 C 5 C for a minimum of 2 hours. 4.1.3.1.2 Place in desiccators until cooled to room temperature. 4.1.3.1.3
28、 Weigh 0.750 0.0005 grams of the dried NaCl. 4.1.3.1.4 Add the salt to a one-liter class A volumetric flask and dilute with DI water to the line. 4.1.3.1.5 After the salt is completely dissolved pipette one milliliter (0.006 milliliters determined from class A glassware) of the solution into a secon
29、d clean one-liter class A volumetric flask and dilute with DI water to the line. 4.1.4 Conduct a single point verification using the calibration solution (at 20 C to 30 C) prior to running test specimens and record the expected and measured values in /ml. Verifications shall be performed daily. If t
30、he result deviates more than 5% from the expected value, an instrument calibration shall be performed following the steps above. EIA-364-111A Page 5 4.1.5 Test specimen preparation and testing NOTE Maintain the extraction solution during analysis and calibration at a temperature between 20 C and 30
31、C. 4.1.5.1 Use clean gloves or forceps when handling test specimens. Handling the specimens with bare hands can contaminate the specimens and influence the results. 4.1.5.2 To determine the total specimen surface area, multiply the area of one test specimen in square centimeters by the number of spe
32、cimens tested in the analysis. As it may be difficult to determine the true surface area of intricate connectors or sockets, this information may be best derived from a computer model of the specimen. 4.1.5.3 Enter the total specimen surface area into the ionograph. 4.1.5.4 Determine the baseline re
33、sistivity of the extraction solution in the ionograph 4.1.5.5 Measure and record the extraction solution temperature 4.1.5.6 Immerse the test specimen(s) in the extraction solution and initiate the analysis. 4.1.5.7 The ionograph will measure the resistivity of the solution during the analysis. The
34、analysis shall be terminated when the resistivity drops below 25% of the baseline and any of the following test termination options are met: 4.1.5.8 The resistivity of the solution has returned to the baseline. 4.1.5.9 The resistivity of the solution has returned to within 75% of the baseline and th
35、e absolute value of the resistivity rate of change is 3% / minute 4.1.5.10 The time of the analysis reaches a minimum of 6 minutes 4.1.5.11 If the resistivity of the solution does not drop below 25% of the baseline during the test, then there is insufficient contamination on the specimens to obtain
36、a valid reading. Repeat the test with new specimens and a larger sample size. If repeating the test using a larger sample size does not rectify the problem, it may not be possible to assess the ionic contamination of the specimen using this technique. 4.1.6 Calculation 4.1.6.1 The ionograph will cal
37、culate the results in total micrograms of NaCl equivalent per square centimeter using the resistivity of the solution integrated over the analysis period and normalized using the surface area entered into the instrument at the start of the test. 4.1.6.2 Record results. EIA-364-111A Page 6 4.2 Method
38、 B, Ion chromatography A person with experience in ion chromatography should perform this procedure. 4.2.1 Test specimen preparation and testing NOTE All container and specimen handling equipment shall be cleaned in a manner consistent with good laboratory practices. 4.2.1.1 Measure the surface area
39、 of a test specimen in square centimeters and multiply it by the number of specimens to be tested. 4.2.1.2 Record the total surface area 4.2.1.3 Heat the temperature of the water bath to 80 C 0.5 C and equilibrate for at least 1 hour. 4.2.1.4 Prepare an extraction solution of 75% / 25% 2% volume / v
40、olume isopropanol to DI water. 4.2.1.5 Place the test specimen(s) into a bag. 4.2.1.6 Using a pipette, put enough extraction solution into the bag to just cover the test specimen(s) 4.2.1.7 Record the volume of extraction solution. 4.2.1.8 Remove most of the air and seal the bag. 4.2.1 9 Put the sam
41、e volume of extraction solution into a bag with no test specimen(s). 4.2.1.10 Remove most of the air and seal the bag. 4.2.1.11 Place the bags into the water bath and let them stand for 1 hour 5 minutes. 4.2.1.12 The seal of the bags should be above the water line to prevent accidental contamination
42、 of the extraction solution. 4.2.1.13 Remove the bags from the water bath and let them cool to room temperature. 4.2.1.14 Remove all of the extraction solution from the bag containing the test specimen(s) using a Pasteur pipette and transfer it to a 100 milliliter volumetric flask. Repeat for the ex
43、traction solution from the bag with no test specimens and transfer it to a different 100 milliliter volumetric flask. EIA-364-111A Page 7 4.2.1.15 Rinse each bag with DI water and add each rinse solution to the appropriate volumetric flask. 4.2.1.16 Bring the volume of each flask to 100 milliliters
44、0.08 milliliters by adding DI water. 4.2.2 IC analysis 4.2.2.1 Calibrate the instrument per the manufacturers recommendations, using the ionic standards to be eluted by the selected column. 4.2.2.2 The cations, anions, and weak organic ions are separated using different analytical columns. The instr
45、ument manufacturers recommendations should be followed for which analytical column is appropriate for each separation. 4.2.2.3 Dilute, if necessary, each extraction solution with the aqueous buffer solution that will be used in the separation of the ionic species. Dilution will depend on the cleanli
46、ness of the specimen(s) being tested. 4.2.2.4 Record the total dilution volume 4.2.2.5 Inject each extraction solution onto the appropriate IC analytical column(s). 4.2.2.6 The instrument will report each ion detected and its concentration in ppm, see Table 1 for common ions of interest. 4.2.3 Calcu
47、lation 4.2.3.1 Use the following formula to calculate the contamination level of the tested specimens normalized to the surface area. ssatdwppmbtdwppmsCi(1) where: Ci = Contamination level of a specific ion per square centimeter ppms = ppm results from sample solution by weight tdw = total dilution
48、solution in grams ppmb = ppm results from blank by weight ssa = surface area of the test specimen(s) in cm2 EIA-364-111A Page 8 4.2.3.2 Use the following formula to calculate the total ionic contamination in NaCl equivalents normalized to the surface area. ssaISequNaClequppmscmNaCli 2/(2)NaCli = NaC
49、l equivalents in micrograms for a given ionic species i ppms = ppm results from sample solution by weight NaClequ = NaCl equivalent weight (g/Mole) = 58.5 g/Mole Isequ = equivalent weight of the ionic species (g/Mole) ssa = surface area of the test specimen(s) in cm24.2.3.2.1 The following example illustrates calculating the sodium chloride equivalent for 50 ppm Na: MoleggNaCli/23g/Mole 58.5 Na 50ppm2.127(3) 4.2.3.2.2 Continuing the example above, the following illustrates calculating sodium chloride equivalent p
