ASTM D4486 Test Method for Kinematic Viscosity of Volatile and Reactive Liquids
6. Apparatus
6.1 Viscometer Thermostat - Any transparent liquid or vapor bath of sufficient depth such that at no time during the measurement will any portion of the sample in the viscometer be less than 20 mm below the surface of the bath liquid or less than 20 mm above the bottom of the bath may be used. The temperature control must be such that for the range from 15 to 100°C (60 to 212°F) the temperature of the bath medium does not vary by more than 0.02°F (0.01°C) over the length of the viscometers, or between the position of each viscometer, or at the location of the thermometer. For temperatures outside this range, the variation must not exceed 0.05°F (0.03°C).
6.2 Temperature-Measuring Device - Suitable liquid-in-glass Kinematic Viscosity Test Thermometers, covering the range of test temperatures indicated in Table 1, as listed in Specification E 1, make certain that they have been standardized before use (see 5.2). Any other thermometric device is permissible provided that the same accuracy can be obtained.
6.3 Timing Device - Any timing device may be used provided that the readings can be taken with a discrimination of 0.2 s or better, and that it has an accuracy within +/-0.07 % when tested over intervals of 15 min.
6.3.1 Electrical timing devices may be used if the current frequency is controlled to an accuracy of 0.05 % or better. Alternating currents, as provided by some public power systems, are intermittently rather than continuously controlled. When used to actuate electrical timing devices, such control can cause large errors in viscosity flow measurements.
7. Reagents and Materials
7.1 Viscosity Oil Standards, conforming to ASTM viscosity oil standards having the approximate kinematic viscosity shown in Table 2. Certified kinematic viscosity values are compared by annual cooperative tests by a number of laboratories and are supplied with each portion.
7.2 Chromic Acid (Cleaning Solution) - (Warning - Causes severe burns. A recognized carcinogen. Strong oxidizer, contact with organic material may cause fire. Hygroscopic. See A1.2.)
7.2.1 Other suitable cleaning solutions are available. In referee testing situations, glassware shall be cleaned with a cleaning solution agreed upon by the parties involved.
7.3 Acetone - (Warning - Extremely flammable. Vapors may cause flash fire. See Annex A1.3.)
7.4 Hydrochloric Acid (Concentrated) - (Warning - Poison. Corrosive. May be fatal if swallowed. Liquid and vapor cause severe burns. Harmful if inhaled. See Annex A1.4.)
