1、EIA 402 72 W 3234600 O067777 1 W r EIA STANDARD Liquid Rosin Fluxles RSm402 September 1972 Engineering Deprtment ELECTRONIC INDUSTRIES ASSOCIATION NOTICE EIA engineering standards are designed to serve the public interest through eliminating mis- understandings between manufacturers and purchasers,
2、facilitating interchangeability and improve- ment of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such standards shall not in any respect pre- clude any member or non-member of EIA from manufacturing or s
3、elling products not conforming to such standards, nor shall the existence of such standards preclude their voluntary use by those other than EIA members whether the standard is to be used either domestically or internationally. Recommended standards are adopted by EIA without regard to whether or no
4、t their adoption may involve patents on articles, materials, or processes. By such action, EIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the recommended standards. Published by ELECTRONIC INDUSTRIES . ASSOCIATION Engineering Dep
5、artment 2001 Eye Street, N. W., Washington, D. C. 20006 Electronic Industries Association 1972 All rights reserved PRICE: $1.30 EIA 402 72 m 3234600 0067803 b m t RS-402 Page 1 LIQUID ROSIN FEUXES (From Standards Proposal No. 1 122, formulated under the cognizance of EIA Working Group P- 7.4 on Sold
6、ers and Fluxes.) 1 PIJRPOSE The purpose of this standard is to provide an industry standard for liquid rosin fluxes used for soldering. 2 SCOPE This standard defines and characterizes liquid rosin fluxes of three types. 3 CLASSIFICATION Type LR - Liquid Rosin - non - activated Type LRMA - Liquid Ros
7、in - mildly activated Type LRA - Liquid Rosin - activated 4 REQUIREMENTS 4.1 Composition Type LR shall be composed of rosin and solvent only. Type LRMA and LRA contain additives for the purpose of improving fluxing action. 4.2 Stability and Homogeneity - See Par. 5.2 for Test Method No separation of
8、 flux constituents or crystallization of rosin shall be evident. 4.3 Resistivity of Water Extract - See Par. 5.3 for Test Method Type LR - 100,000 ohm - cm minimum TypeLRMA - 100,000 ohm - cm minimum Type LRA - 45,000 ohm - cm minimum 4.4 Effect on Copper Mirror - See Par. 5.4 for Test Method Not ap
9、plicable to Type LRA. When types LR and LRMA are tested in accordance with Par. 5.4, the flux shall show no more evidence of attack on the copper than that of the control flux. 5 TEST METHODS 5.1 All tests shall be conducted on fluxes as received. 5.2 Stability and Homogeneity Mix the flux thoroughl
10、y and then cool a 100-rnl sample to 5 * 2OC (41 o f 3.6F) in a cold chamber and maintain at that temperature for 60 to 65 minutes. Examine the contents of the container to determine compliance with 4.2. a /Lx .- - I EIA 402 72 3234600 0067802 8 RS-402 Page 2 5.3 Resistivity of Water Extract Thorough
11、ly clean five 180-ml electrolytic beakers, eight-watchglasses (five for beaker covers and three for test samples), and one 50-ml graduated cylinder. Cleaning shall be performed as follows: wash in hot-water-detergent solution, wash several times with tap water, and rinse at least five times with dis
12、tilled water. Perform all of the following operations in a laboratory maintained at 23 * 2OC (73.4 * 3.6OF). Pour 50 cubic centimeters (ce) of distilled water at 23 * 2OC (73.4 * 3.6F) into each of the five beakers and cover with watchglass. Measurements of the resistivity of the water in each beake
13、r shall be made to determine whether the beakers have been thoroughly cleaned. The resistivity of the distilled water in each beaker shall be not less than 500,000 ohm - cm at 23O * 2OC (73.4O * 3.6OF). If the resistivity of the water in any beaker is less than 500,000 ohm - cm, the beakers shall be
14、 rewashed, 50 cc of distilled water again added, and the resistivity remeasured. This procedure shall be repeated until the resistivity of the water in each beaker is not less than 500,000 ohm - em. Cover all beakers. A conductivity cell whose cell constant is approximately O. 1 , and a conductivity
15、 bridge model RC - 16B2 made by Industrial Instruments Company, or equal, may be used for these measurements. The distilled water employed shall have a resistivity of not less than 500,000 ohm - cm at 23 5 2OC (73.4O * 3.6OF). Using a calibrated dropper or syringe, introduce 0.10 * .O05 ml of the fl
16、ux to be tested into three of the five beakers. Cover the beakers with watchglasses. Heat the five beakers at one time on a hot plate until the contents begin to boil, and continue boiling for 1 minute. Remove the beakers from the hot plate and allow to cool at room temperature for approximately 10
17、minutes. Place beakers in a bath of cool 15O to 18OC (59O to 64.4OF), running tapwater and allow contents of beakers to cool, to 23OC * 20C (73.40 * 36OF). Remove beakers from the bath immediately after reaching 23OC * 20C (73.40 * 36OF). Determine the resistivity of the water extracts in the follow
18、ing manner: Thoroughly wash the con- ductivity cell with distilled water and immerse it in the water extract of one sample. Make instru- ment reading. Thoroughly wash conductivity cell in distilled water and immerse in a water control. Make instrument reading. Thoroughly wash conductivity cell in di
19、stilled water and immerse in a water extract. Make instrument reading. Thoroughly wash conductivity cell in distilled water and continue measuring resistivities of the remaining control and water extract. The resistivity of each of the controls shall be not less than 500,000 ohm - cm at 23O * 2OC (7
20、3.4O * 3.6OF). If the con- trol value is less than 500,000 ohm - cm, it indicates that the water was contaminated with water- soluble ionized materials and the entire test shall be repeated. Calculate the mean of the specific resistances of the water extracts of the flux. 5.4 Effect on Copper Mirror
21、 5.4.1 Preparation of Control - Standard Flux Make up a control - standard flux by using 3576, by weight, of rosin conforming to Class A, Type II, Grade WW, of Specification LLL-R-626, and dissolving in reagent grade 99% iso- propyl alcohol. 5.4.2 Preparation of Copper Mirror * The copper mirror may
22、 be prepared as follows: obtain approximately 2” x 4” x 1 /I 6” (50.8 mm x 101.6 rnm x 1.6 mm) transparent, clear, polished-plate sheets of glass, of the type used for photographic plates, by washing the plates in concentrated sodium hydroxide to remove emulsion and gelatin. Wash both surfaces of ea
23、ch plate separately and carefully with soap in water or a detergent in water, being careful not to touch the surfaces of the o- - EIA 402 72 3234600 0067803 T RS-402 Page 3 glass sheets. Hold the sheets of glass at the edges, using rubber gloves to prevent contamina- tion of the plates with oils and
24、 salts from the fingers. Rinse each plate with tap water until all detergent or soap is reinoved. Soak each plate in concentrated nitric acid for 15 to 20 minutes. Remove plates from the nitric acid and rinse thoroughly with distilled water until all acid is removed. After the final rinse, allow pla
25、tes to soak in distilled water for at least 1 /2 hour. To prevent dust and dirt from collecting on the surfaces, store the plates under distilled water until ready for coating. A short time prior to coating, remove a plate from the distilled water and allow to air-dry in a dust-free atmosphere. Perf
26、orm the vacuum deposition at pressures below 5 x 1 O-5 millimeters of mercury, using standard vacuum-evaporation apparatus and techniques. Employ a filament-to-plate distance of at least 12” (304.8 mm) to obtain a uniform copper film. Use a chemically pure copper wire or copper granules in a tantalu
27、m, molydenum, or columbium boat. Coat each plate on one 2” x 4” (50.8 mm x 101.6 mm) surface with sufficient copper to permit 10 * 5% transmission of normal incident light of 5,000 angstrom units, as determined with any suitable standard photoelectric spectrophometer, using a clean sheet of dass as
28、a standard. Store the panel or mirror in a desiccator until ready for use. * Commercial copper mirrors may be purchased from suppliers such as Metavac, Inc., 45 - 68 162nd St., Flushing, N. Y. 13337, Evaporated Metal Films Corp., Ithaca, N. Y. 14850. or others, provided they meet the requirements of
29、 Par. 5.4.2. 5.4.3 Procedure .- O This test shall be performed as follows: place approximately 0.05 ml of the flux under test and 0.05 ml of the control-standard flux adjacent to each other on the face of a flat, vacuum- deposited copper mirror. The dropper shall not be permitted to touch the copper
30、 surface, and the panel or mirror shall be protected at all times from dirt, dust, and fingerprints. Store the panel or mirror in a horizontal position at 23O relative humidity in a dust-free cabinet for 24 * 1/2 hours. At the end of the 24 hour storage period, immerse the mirror in clean isopropyl alcohol and examine visually against a white background to determine compliance with 4.4. If the control flux shows more than a superficial etching of the copper mirror, the test shall be repeated with a fresh copper mirror. 2OC (73.4O 5 3.6OF) and 50 * 5%
