ASTM F1598-1995(2014) Standard Test Method for Determining the Effects of Chemical Solvent Exposure to a Membrane Switch Graphic Overlay &40 Spot Test Method&41 《测定化学溶剂对薄膜开关 图形重叠影响.pdf

1、Designation: F1598 95 (Reapproved 2014)Standard Test Methodfor Determining the Effects of Chemical/Solvent Exposure toa Membrane Switch/Graphic Overlay (Spot Test Method)1This standard is issued under the fixed designation F1598; the number immediately following the designation indicates the year of

2、original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the testing of any surface thatmay

3、be exposed to liquid chemical(s).1.2 This test method is not designed for immersion testingconditions or material edge attack.1.3 This test method is designed for evaluation of visualchanges. In certain instances physical (non-visual) changesmay occur and functional testing may be appropriate.1.4 Th

4、e values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.5 This standard does not purport to address all of thesafety concerns, if any, associated

5、 with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2F1595 Practice for Viewing Conditions for Visual Inspectionof M

6、embrane Switches3. Significance and Use3.1 The specific chemical(s) selected is at the discretion ofthe customer and vendor.3.2 Variations in results may be expected due to differentrates of chemical evaporation. The use of a watchglass withsealed edges is intended to curtail or eliminate evaporatio

7、n ofthe chemical.4. Apparatus4.1 Watchglass, 1.5 in. (38 mm).4.2 Medical gauze pad, 0.75 in.2(19 mm2), 60.125 in. (3mm).5. Conditioning5.1 Condition all specimens and chemical(s)/solvent(s) for72 h at 68 to 77F (20 to 25C) and 20 to 80 % relativehumidity (RH).5.2 The test specimen should be clean an

8、d dry beforetesting.5.3 Cleaning of the Test Specimen :5.3.1 Use a clean lint-free piece of absorbent material andeither reagent grades of n-heptane or isopropyl alcohol.5.3.2 Wipe the surface of the test area with a saturated pieceof cleaning material.5.3.3 Dry the test area with fresh absorbent cl

9、eaning mate-rial.5.3.4 Repeat these two procedures three times to ensurethorough cleanliness.5.3.5 Inspect the test area to ensure no visual damage hasbeen caused by the cleaning process.6. Procedure6.1 Conduct the test at 68 to 77F (20 to 25C) and 20 to80 % RH.6.2 Mark the test specimen with a test

10、 field that is approxi-mately a size of 2 in.2(51 mm2). Mount the specimenhorizontally.6.3 Completely saturate a 0.75-in.2(19-mm2) of gauze withthe test chemical. Place the gauze within the test field andcover with a watchglass with the edges sealed if necessary toensure that the surface remains wet

11、 for the duration of the testperiod. If the test specimen is embossed, perform the test on anembossed area that shall be completely covered with thewatchglass.6.4 A larger watchglass and gauze pad may be required dueto the test surface. In this instance the size relationship betweenthe field area wa

12、tchglass and gauze should remain the same.1This test method is under the jurisdiction of ASTM Committee F01 onElectronics and is the direct responsibility of Subcommittee F01.18 on MembraneSwitches.Current edition approved June 1, 2014. Published July 2014. Originally approvedin 1995. Last previous

13、edition approved in as 2007 as F1598-95(2007). DOI:10.1520/F1598-95R14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe AST

14、M website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.5 The duration of the test shall be determined by thecustomer and vendor.6.6 After the test, wipe off the test area with a clean lint-freematerial. Repeat the cleaning proced

15、ure in 5.2 to remove anysurface contamination of the test chemical.7. Interpretation of Results7.1 Allow the test specimen(s) to recover for 24 h at 68 to77F (20 to 25C) and 20 to 80 % RH prior to viewing the testarea for result purposes.7.2 View the test area in accordance with Practice F1595 todet

16、ermine any visual changes.7.3 Look for discoloration, crazing, cracking, swelling,blistering, pitting, hazing or other appearance changes.8. Precision and Bias8.1 The precision and bias of this test method cannot bedetermined.9. Keywords9.1 chemical exposure; graphic overlay; membrane switchASTM Int

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19、ould be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on St

20、andards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 95 (2014)2