Home>ASTM Standards>ASTM D1986-14(R2021) pdf free download

ASTM D1986-14(R2021) pdf free download

ASTM D1986-14(R2021) pdf free download.Standard Test Method for Determining the Apparent Viscosity of Polyethylene Wax
1. Scope
1.1 This test method describes the determination of the viscosity of polyethylene wax using small-volume, concentric cylinder, rotational viscometer and a temperature bath at 140 °C. 1.2 The values stated in SI units are to be regarded as standard. The units in parentheses are provided for user convenience and are not 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 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.
5. Apparatus
5.1 Small-volume, Coaxial Rotational Viscometer 3 —The essential instrumentation required providing the minimal rota- tional viscometer analytical capabilities for this method in- clude: 5.1.1 Drive Motor, to apply an unidirectional rotational displacement to the specimen at a rate of 0.05 to 6.0 rad/s (0.5 to 60 r/min) constant to 61 %. 5.1.2 Force Sensor, to measure the torque up to 0.6 mN·m developed by the specimen to the rotational displacement of the rotational element. 5.1.3 Coupling Shaft, or other means to transmit the rota- tional displacement from the motor to the specimen. 5.1.4 Rotational Element, Spindle or Tool, to fix the speci- men between the drive shaft and a stationary position. A coaxial spindle with the dimensions shown in Fig. 1 is suitable for this test method. 5.1.5 Data Collection Device, to acquire and display mea- sured or calculated signals from the test. The minimum output signals required for apparent viscosity are torque, rotational speed, temperature and time. 5.1.6 Stand, to support, level and adjust the height of the drive motor, shaft and rotational element.5.1.7 Auxiliary Instrumentation, useful in conducting this test method includes: Data Analysis Capability, to provide viscosity, stress or other useful parameters derived from measured signals. Level, to indicate the vertical plumb of the drive motor and shaft geometry. 5.2 Temperature Sensor, to provide an indication of the specimen temperature over the range of130 to 160 °C to within 60.1 °C. 5.3 Temperature Bath, to provide a controlled isothermal temperature environment for the specimen. 5.4 Temperature Controller, capable of operating the tem- perature bath at an isothermal temperature over the range of 130 to 160 °C, constant to within 60.5 °C. 5.5 Small Volume Container, with Insulating Cap, with a capacity of 9 to 10 mL to hold the test specimen in the temperature bath during testing.
6. Calibration
6.1 The viscometer is calibrated using Newtonian fluids provided by the manufacturer. No zero adjustment is needed since experience has shown that the zero point will not vary a well maintained instrument. The viscometer instrument and spindles are precision equipment that should be protected from undue shock and mishandling. Physical damage to the instru- ment will often reveal itself as lack of pointer oscillation evenly about the zero point when the instrument is operated in air. 6.2 The instrument may be further calibrated using standard reference fluids. Suitable fluids are available in nominal viscosities up to 15 Pa·s at 149 °C (300 °F). 3 A procedure for instrument calibration using standard reference fluids should be available from the instrument manufacturer. Results obtained using standard reference fluids should not deviate from the nominal viscosity by more than 2 %. 6.3 To check the temperature controller and bath, place a quantity ofpolyethylene wax in the sample container and allow it to melt. Insert the thermal sensor through the insulating cap and fix it at a proper depth, but not in contact with the walls of the container. Adjust the temperature controller to provide the desired test temperature. Rotate the sensor during temperature reading to minimize the effect of thermal gradients in the sample. Continue temperature readings and controller adjust- ment until minimum deviation from test temperature is ob- tained. Minimum deviation may vary between laboratories, depending upon the controller, but in no case should exceed 60.5 °C. Repeat this procedure for any test temperature desired within the scope of this test method.

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