This intermational tandard was developed in accordance with internatioally recognized principles on standardiation establisedin the Decision on Principles for the Development of International Standards,Guides and Recommendations isued by the World Trade Organiation Technical Barier to Trade (TBT)Committe. Designation:D1084-16 (Reapproved 2021) Standard Test Methods for Viscosity of Adhesives1 This standard is issued under the fixed designation D1084;the number immediately following the designation indicates the year of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon(e)indicates an editorial change since the last revision or reapproval. This standard has been approvedfor wse by agencies ofthe U.S.Depariment ofDefense. 1.Scope Bubble Time Method D1601 Test Method for Dilute Solution Viscosity of Ethyl- 1.1 These test methods. cover the determination of the viscosity of free-flowing adhesives. D2556 Test Method for Apparent Viscosity of Adhesives 1.1.1 The limitation of this test method to self-leveling Having Shear-Rate-Dependent Flow Properties Using Ro- adhesives eliminates thixotropic and plasticmaterials whose viscosity is a function of the rate of stirring and previous tational Viscometry history oftheadhesive. 2.2 ISO Document3 ISO 2555 Plastics —Resins in the Liquid State or as 1.2 The values stated in SI units are to be regarded as the Emulsions or Dispersions -Determination of Apparent standard.The values in parentheses are for information only. Viscosity by the Brookfield Test Method 1.3 This standard does not purport to address all of the safety concerns,if any,associated with its use.It is the 3.Terminology responsibility ofthe user ofthis standard to establish appro- 3.1 Definitions. priate safety,health,and environmental practices and deter- 3.1.1 Many terms in these test methods are defined in minethe applicabilityofregulatory limitationspriortouse. Terminology D907. 1.4 This international standard was developed in accor- 3.1.2 viscosity,n-of a liquid,the resistance to flow ex- dance with internationally recognizedprinciples on standard- pressed as the ratio of the applied stress to the resulting rate of izationestablishedintheDecisiononPrinciplesforthe Development oflnternational Standards,Guides andRecom- shearing strain(see Newtonian behavior and thixotropy). (Compare consistency.) mendations issued by the World Trade Organization Technical Barriers to Trade (TBT)Committee. 3.2DefinitionsofTermsSpecifictoThisStandard: 3.2.1 viscosity,n—the ratio of shear stress to shear rate.The 2.Referenced Documents viscosity of a liquid is a measure of the internal friction of the liquid in motion.The unit of dynamic viscosity is the Pascal 2.1 ASTM Standards:2 (poise),which is expressed as dyne-seconds per square centi- D88 Test Method for Saybolt Viscosity D115 metre.For a Newtonian liquid,the viscosityis constant at all Test Methods for Testing Solvent Containing Var- shear rates.For a non-Newtonian liquid,viscosity will vary dependingon shearrate D562 Test Method for Consistency of Paints Measuring Krebs Unit(KU)Viscosity Using a Stormer-Type Viscom- 4.Significance and Use eter D907 Terminology of Adhesives 4.1 Several test methods are noted for viscosity determina- D1200 Test Method for Viscosity by Ford Viscosity Cup tion of Newtonian and near Newtonian flow characteristics. (For adhesives not fitting into this category,Test Method D1545 Test Method for Viscosity of Transparent Liquids by D2556 should be considered.)Four test methods are covered as follows: These test methods are under the jurisdiction of ASTM CommitteD14 on 4.1.1 Method A is applicable only to adhesives that will Adhesives and are the direct responsibility of Subcommitee D14.10 on Working deliver 50 mLin a steady uninterrupted stream from one ofthe Properties. cups described in Section 5 . 4.1.2 Method B is intended for measuring the viscosity of