1、Designation: D 6189 97 (Reapproved 2003)Standard Practice forEvaluating the Efficiency of Chemical Removers for OrganicCoatings1This standard is issued under the fixed designation D 6189; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revis
2、ion, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 The practice evaluates the effectiveness of coatingsremovers used on clear or pigmented coatings as
3、applied towood and metal.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purport to address the safetyconcerns, if any, associated with its use. It is the responsibilityof the user of this standar
4、d to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:D 609 Practice for Preparation of Cold-Rolled Steel Panelsfor Testing Paint, Varnish, Conversion Coatings, andRelated Coating Products
5、2D 823 Practices for Producing Films of Uniform Thicknessof Paint, Varnish, and Related Products on Test Panels2D 3924 Specification for Standard Environment for Condi-tioning and Testing Paint, Varnish, Lacquers, and RelatedMaterials2E 145 Specification for Gravity-Convection and Forced-Ventilation
6、 Ovens33. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 coatings remover, na product that is formulated forthe removal of paint, varnish, lacquer, shellac, or polyurethanetop coats, or related coatings, or both.4. Summary of Practice4.1 Test panels are coated and force dried. T
7、he coatingsremover is applied with a brush and the loosened coating islifted with a plastic scraper after a specified time. Coatingsremoval efficiency is determined and recorded using a ratingscheme of 5 to 0.5. Significance and Use5.1 Old coatings, such as paint or related coatings, may haveto be r
8、emoved from a surface before successful recoating canoccur. This practice can be used to test the coatings removalefficiency of products designed for such use.6. Apparatus6.1 Forced Draft Oven, Type IB, in accordance with Speci-fication E 145.6.2 Paint Brush, containing nylon/polyester bristles.6.3
9、Plastic Paint Scraper.6.4 Very Fine Garnet Abrasive-Type Sandpaper, 240 to 220grade.6.5 Stopwatch.7. Testing Materials7.1 FinishesIt is recommended to test coatings removerson a variety of finishes such as latex enamel, alkyd enamel,polyurethane, varnish, shellac and nitrocellulose lacquer, or asagr
10、eed upon between the purchaser and the seller.7.2 Wood test panels of solid wood or wood laminate suchas birch plywood, fir, pine, oak or walnut. Smooth sawn panelsof dimensions not less than 300 by 300 mm (12 by 12 in.) and8-mm (516-in.) thick.7.3 Steel test panels with dimensions of 150 by 300 mm
11、(6by 12 in.) and 0.8-mm (0.032-in.) thick.8. Panel Preparation8.1 Wood Panel PreparationStore the wood panels for aleast 6 days under standard conditions as specified in Specifi-cation D 3924.8.2 Sand the panels lightly with sandpaper as defined in 6.4and wipe them clean of debris.8.3 Coat one side
12、of a panel with a test coating by anymethod specified in Practices D 823 to ensure uniform filmthickness, using the manufacturers recommended coveragerate. Allow the coating to dry overnight under standardconditions as specified in Specification D 3924.1This practice is under the jurisdiction of AST
13、M Committee D01 on Paint andRelated Coatings, and Materials, and Applications and is the direct responsibility ofSubcommittee D01.42 on Architectural Coatings.Current edition approved Oct. 1, 2003. Published October 2003. Originallyapproved in 1997. Last previous edition approved in 1997 as D 6189 9
14、7.2Annual Book of ASTM Standards, Vol. 6.01.3Annual Book of ASTM Standards, Vol. 14.04.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.8.4 Apply a second coat of the same type of coating of adifferent color (if pigmented) using the s
15、ame method. Forcedry at 50C (120F) overnight. Allow the panel to cool toambient temperature.8.5 Apply and dry a third coat of the same type of coatingas in 8.4.NOTE 1Apply clear finishes in two coats following the manufactur-ers recommended application instructions under the same drying condi-tions
16、described in 8.3 and 8.4.8.6 Metal PreparationClean the metal panels as describedin Procedure D, Practice D 609 until panels are free fromdebris, oily film, and corrosion.8.7 Apply three coats of the test finish as directed in 8.3, 8.4,and 8.5.9. Procedure9.1 Apply coatings remover in accordance wit
17、h the manu-facturers instructions, using a solvent-resistant brush unlessotherwise directed by the manufacturer. Stroke the surface inone direction only. Start the stopwatch after the panel has beenfully coated. Leave the panel in the horizontal position duringthe test.9.2 Wait 15 min for solvent-bo
18、rne removers and 60 min forwater-borne removers, or at times specified by the manufac-turer for the type of coating being removed.9.3 Scrape the surface with a plastic paint scraper to removethe coating without damaging the substrate.9.4 Rate the test panel for coatings removal efficiency on ascale
19、from 5 to 0 in accordance with the following:Rating Amount of Coatings Removal, %5 10047535022110 No removal9.5 Rate the effect of the coatings removal on the conditionof the substrate on a scale from 5 to 0 in accordance with thefollowing:Rating Condition of Substrate5 No effect4 Very slight3 Sligh
20、t2 Moderate1 Considerable0 Complete FailureNOTE 2Typical effects of coatings removal on wooden substratesinclude grain-raising and an increase in surface roughness. Typical effectson metal substrates include rusting and pitting.10. Report10.1 Report the following information:10.1.1 Brand, color, and
21、 lot or batch number of the finishused,10.1.2 Type of substrate used,10.1.3 Method of coatings application,10.1.4 Coatings removal efficiency rating,10.1.5 Time of removal to the nearest minute, if differentfrom 9.2,10.1.6 Rating for condition of substrate, and10.1.7 Report any significant deviation
22、s from this practice.11. Keywords11.1 coatings, paint and paint strippers; coatings removers;effectiveness of paint removersASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are exp
23、ressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revis
24、ed, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may
25、 attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, 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).D 6189 97 (2003)2
