Active Standard ASTM D4889 | Developed by Subcommittee: D20.22
Book of Standards Volume: 08.02
Historical (view previous versions of standard)
Significance and Use
These test methods can be used for research or for quality control to characterize isocyanates used in polyurethane products.
Viscosity measures the resistance of a fluid to uniform continuous flow without turbulence or other forces.
Some isocyanates exhibit non-Newtonian behavior under certain conditions. Whenever possible, generate results for comparison under the same conditions, that is, the same spindle/speed combination for Brookfield viscosity and the same tube size for Cannon-Fenske viscosity.
1.1 These test methods (A and B) determine the viscosity of crude or modified isocyanates. They are applicable to products derived from toluene diisocyanate, methylene-bis-(4-phenylisocyanate), and polymethylene polyphenylisocyanates (see Note 1).
Note 1—Test method A includes a procedure for measuring dynamic viscosity using a rotational Brookfield instrument. Test method B is simply a reference to a general procedure for measuring kinematic viscosity using a Cannon-Fenske instrument, D445.
1.2 The values stated in SI units are to be regarded as standard.
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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazards statements see Warnings at the end of 5.1 and 10.5.
Note 2—There is no known ISO equivalent to this standard.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)
D883 Terminology Relating to Plastics
E1 Specification for ASTM Liquid-in-Glass Thermometers