ASTM_C_461_-_81_2015.pdf

Designation:C46181(Reapproved 2015)Standard Test Methods forMastics and Coatings Used With Thermal Insulation1This standard is issued under the fixed designation C461;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()indicates an editorial change since the last revision or reapproval.1.Scope1.1 These test methods cover procedures for sampling andtesting mastics and coatings for use as weather and vaporbarrier finishes on thermal insulations and for other accessoryuse.1.2 The 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.1.3 The test methods appear in the following order:SectionSampling4Uniformity and Storage Stability5Stability Under Freezing6Density and Weight per Gallon7Consistency8Solids Content9Content of Volatiles and Coverage of Mastics and Coatings10Build11Drying Time12Flash Point131.4 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 determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C168 Terminology Relating to Thermal InsulationC419 Practice for Making and Curing Test Specimens ofMastic Thermal Insulation CoatingsD56 Test Method for Flash Point by Tag Closed Cup TesterD71 Test Method for Relative Density of Solid Pitch andAsphalt(Displacement Method)D93 Test Methods for Flash Point by Pensky-MartensClosed Cup TesterD140 Practice for Sampling Bituminous MaterialsD217 Test Methods for Cone Penetration of LubricatingGreaseD2196 Test Methods for Rheological Properties of Non-Newtonian Materials by Rotational ViscometerD3278 Test Methods for Flash Point of Liquids by SmallScale Closed-Cup Apparatus3.Terminology3.1 DefinitionsFor definitions of terms used in these testmethods,see Terminology C168.4.Sampling4.1 Prior to opening or sampling,or both,any mastic orcoating,its Material Safety Data Sheet(MSDS)should bereviewed to ensure appropriate precautions or personal protec-tive equipment,or both,are utilized.4.2 Take the samples for laboratory examination from theoriginal containers immediately after stirring to a uniformcondition.Determine the number of containers sampled asrequired to represent a shipment in accordance with PracticeD140.Restir the composite sample immediately before takingout portions for individual tests.5.Uniformity and Storage Stability5.1 Open the original containers and examine them foruniformity of contents.Record the degree of separation,if any,into portions of appreciably different consistency,such as thickor thin layers,sedimentation or coagulation,etc.,also ofdifficulty encountered in stirring to a uniform condition.5.2 Examine the contents of a full container of not less than1 qt(1 L)that has stood undisturbed for 48 h.Make notationof any separation of solvent or water,coagulation,or settle-ment of suspended matter,that cannot be overcome by mod-erate agitation.5.3 Additionally,if required,examine and report the condi-tion in the container after 3 months storage,examining foruniformity in accordance with 5.1.6.Stability Under Freezing6.1 Fill a 1-pt(500-mL)press-top tin can three quarters fullwith the coating,and hold the filled and closed container in a1These test methods are under the jurisdiction of ASTM Committee C16 onThermal Insulation and are the direct responsibility of Subcommittee C16.33 onInsulation Finishes and Moisture.Current edition approved Dec.1,2015.Published December 2015.Originallyapproved in 1960.Last previous edition approved in 2008 as C461 81(2008).DOI:10.1520/C0461-81R15.2For 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 ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 chamber at a temperature of 0 6 5F(18 6 3C)for aminimum of 12 h consecutively under natural convectionconditions.6.2 At the expiration of the freezing period,permit thecoating to warm to room temperature by exposure of thecontainer to the temperature of the laboratory for a minimum of6 h.After the first operation of freezing and thawing,repeat theprocedure twice so that the coating will have been subjected tothree cycles of freezing and thawing.6.3 After the completion of the third cycle,open thecontainer,and note any separation of solvent or water,coagulation,settlement of suspended matter,or the presence ofdistinct layers,or a combination of these.If the compoundcannot be rendered homogeneous by moder