ASTM D1084-16(R2021) pdf free download

ASTM D1084-16(R2021) pdf free download.Standard Test Methods for Viscosity of Adhesives
1. Scope
1.1 These test methods cover the determination of the viscosity of free-flowing adhesives. 1.1.1 The limitation of this test method to self-leveling adhesives eliminates thixotropic and plastic materials whose viscosity is a function of the rate of stirring and previous history of the adhesive. 1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions: 3.1.1 Many terms in these test methods are defined in Terminology D907. 3.1.2 viscosity, n—of a liquid, the resistance to flow ex- pressed as the ratio of the applied stress to the resulting rate of shearing strain (see Newtonian behavior and thixotropy). (Compare consistency.) 3.2 Definitions ofTerms Specific to This Standard: 3.2.1 viscosity, n—the ratio of shear stress to shear rate. The viscosity of a liquid is a measure of the internal friction of the liquid in motion. The unit of dynamic viscosity is the Pascal (poise), which is expressed as dyne-seconds per square centi- metre. For a Newtonian liquid, the viscosity is constant at all shear rates. For a non-Newtonian liquid, viscosity will vary depending on shear rate.
4. Significance and Use
4.1 Several test methods are noted for viscosity determina- tion of Newtonian and near Newtonian flow characteristics. (For adhesives not fitting into this category, Test Method D2556 should be considered.) Four test methods are covered as follows: 4.1.1 Method A is applicable only to adhesives that will deliver 50 mL in a steady uninterrupted stream from one of the cups described in Section 5. 4.1.2 Method B is intended for measuring the viscosity of adhesives covering a range from 0.05 Pa · s to 200 Pa · s (50 to 200 000 cP) and is limited to materials that have or approach Newtonian flow characteristics. 4.1.3 Method C is intended primarily as a control method for determining the viscosity of adhesives that have or ap- proach Newtonian flow characteristics. 4.1.4 Method D is intended primarily as a control method for determining the viscosity of materials that have an equiva- lent viscosity no greater than approximately 3000 mPa · s (cP) and is limited to materials that have or approach Newtonian flow characteristics.
6. Procedure
6.1 Bring the sample to be tested and the viscosity cup to a temperature of 23 6 0.5°C (73.4 6 0.9°F) (preferably in a constant-temperature room). Then mount the consistency cup in the clamp provided for the purpose and place the receiving cylinder in position. With the outlet ofthe cup closed by means of the finger, pour the sample into the cup until it is filled to overflowing. Strike off the excess with a straightedge, and then remove the finger from over the outlet and allow the sample to flow into the receiving cylinder. Determine the number of seconds from the time the finger is removed from the orifice until the top of the meniscus reaches to 50-mL mark on the cylinder by a stop watch and record as the viscosity of the material.