ASTM D2669 Standard Test Method for Apparent Viscosity of Petroleum Waxes Compounded with Additives (Hot Melts)
1. Scope
1.1 This test method covers the determination of the apparent viscosity of petroleum waxes compounded with additives (hot melts). It applies to fluid hot melts having apparent viscosities up to about 20 Pa·s at temperatures up to 175°C (347°F).
NOTE 1 - For petroleum waxes and their blends having low apparent viscosities, below about 15 mPa·s, Test Method D445, is especially applicable.
1.2 The values stated in SI units shall be regarded as the standard. One pascal second (Pa·s) = 1000 centipoises (cP). One millipascal second (mPa·s) = 1 centipoise (cgs units).
1.3 WARNING - Mercury has been designated by many regulatory agencies as a hazardous material that can cause central nervous system, kidney and liver damage. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Caution should be taken when handling mercury and mercury containing products. See the applicable product Material Safety Data Sheet (MSDS) for details and EPA's for additional information. Users should be aware that selling mercury and/or mercury containing products into your state or country may be prohibited by law.
1.4 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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)
E1 Specification for ASTM Liquid-in-Glass Thermometers
E180 Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals (Withdrawn 2009)
3. Terminology
3.1 Definitions:
3.1.1 viscosity - the ratio of shear stress to shear rate. Viscosity of a liquid is a measure of the internal friction of the liquid in motion. The unit of dynamic viscosity is the pascal second. For a Newtonian liquid, the viscosity is constant at all shear rates. For a non-Newtonian liquid, viscosity will vary depending on shear rate.
3.1.2 viscosity, apparent - the viscosity determined by this method, expressed in pascal seconds. Its value may vary with the spindle and rotational speed selected because many hot melts are non-Newtonian.
