ASTM_D_6215_-_98a.pdf

Designation:D 6215 98aStandard Guide forRemoval of Oily Soils from Metal Surfaces1This standard is issued under the fixed designation D 6215;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,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 This guide covers the determination of the amount of anoily surface removed from a metal surface.1.2 This guide employs the use of a fluorescent dye as atracer to measure the level of residual oil.1.3 This guide is designed to evaluate metal cleaners de-signed or developed for the removal of oily and greasy soilsfrom metal surfaces such as stamping presses,metal cans,metal tanks,and other such items.1.4 This guide employs the use of a generic oily soil.Asthere is no one universal oily soil,the choice of the soil andsubstrate used should be agreed upon by the testing laborato-ry(s)and those using the data to evaluate cleaning performanceprior to testing.1.5 This guide is not intended for use as an evaluation toolfor critical areas,which might include surfaces to be painted.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and to determine theapplicability of regulatory limitations prior to use.2.Terminology2.1 Definitions:2.1.1 soilforeign matter present on a metal surface.2.1.2 substrateany metal-based surface that is to becleaned.2.1.3 water breakvisual rating of a metal surface rinsedwith deionized water whereby the rinse water film breaks intobeads or runs off exposing the surface,or both,which isindicative of residual soil.2.1.4 water break freevisual rating of a metal surfacerinsed with deionized water whereby the rinse water forms auniform wetted layer covering the surface.3.Summary of Guide3.1 An oily based soil is artificially tagged with a fluores-cent dye tracer.The soil is artificially applied to a test metalcoupon.The soiled coupon is then cleaned in a beaker of washliquor using a magnetic stir plate and stir bar.Followingcleaning,the metal coupon is immediately removed to a beakerof extraction solvent to remove any remaining residual oilysoil.The solvent extract is then measured for fluorescent dyeabsorbance using a spectrophotometer.4.Significance and Use4.1 The guide suggests a laboratory guide for use in thedevelopment of cleaners designed to remove oily based soilsfrom metal surfaces.This guide can be used to evaluate theremoval of numerous oily type soils from a myriad of metalsurfaces.This guide should find use in those industries requiredto clean,among other,metal cans,rolled metals,large indus-trial production machinery,and blending vessels.4.2 This guide employs the use of a fluorescent tracer,which will allow for the accurate quantitative measurement ofthe amount of soil removed and will assist in the ranking ofcleaner performance.4.3 This guide will provide a fast and efficient test protocolfor the determination of oily soil removal by a wet cleaningprocess.This guide will result in a time savings over othermethods which traditionally must allow for a drying step priorto weight loss determinations.Further,the guide will quantitatethe level of soil removed,thus providing a means of evaluatingthe cleanliness of a surface which may not be water break free.5.Apparatus5.1 Beakers,150 and 250 mL.5.2 Volumetric Flasks,100 mL.5.3 Magnetic Stir Bars,1 in.length,and combination hotplate stirrers.5.4 Adjustable Wavelength Spectrophotometer.5.5 Graduated Serological Pipets.5.6 Black Light.5.7 Fluorescent Yellow 131SC Dye.5.8 White Mineral Oil.5.9 Propylene Glycol n-Butyl Ether(PnB).5.10 Metal Coupon,1 by 3 in.,16 gage,#14 finish,316stainless steel.6.Preparation of Soil/Substrate Combination6.1 Clean metal test coupons in an industry specified stan-dard alkaline surfactant based detergent.Scrub the panels toremove residual soils and avoid surface damage.Rinse thepanels with appropriate rinse water followed by terminalrinsing with deionized water.Passivate the cleaned and rinsedcoupons in a solution of 20%by weight nitric acid for a1This guide is under the jurisdiction of ASTM Committee D-12 on Soap andOther Detergents and is the direct responsibility of Subcommittee D12.16 on HardSurface Cleaning.Current edition approved June 10,1998.Published January 1999.Originallypublished as D 6215-98.Last previous edition D 6215-98.1AMERICAN SOCIETY FOR TESTING AND MATERIALS100 Barr Harbor Dr.,West Conshohocken,PA 19428Reprinted from the Annual Book of ASTM Standards.Copyright ASTMminimum of 4 h,but not to exceed 24 h.Remove the couponsfrom the nitric acid solution,rinse in deionized water,and seton clean paper towels to dry.Cover the coupons are withadditional paper toweling to provide an appropriate barrieragain