ASTM-C1276 Standard Test Method for Measuring the Viscosity of Mold Powders Above Their Melting Point Using a Rotational Viscometer (Withdrawn 2009)

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Standard Test Method for Measuring the Viscosity of Mold Powders Above Their Melting Point Using a Rotational Viscometer (Withdrawn 2009)


1.1 This test method covers measurement of the viscosity of mold powders above their melting point through the use of a platinum spindle immersed in a platinum crucible containing the molten mold flux. Developed by differential angular velocity between the crucible and spindle, spindle torque is measured and used to calculate the viscosity. Data are generally taken as a function of temperature to describe the viscosity-temperature relationship for the molten mold flux.

1.2 This test method uses a high-temperature furnace and measurements on molten material. Personal protection equipment to wear include high-temperature resistant insulating gloves, coveralls, and a full-face shield.

1.3 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.

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. A specific warning statement is given in Note 1.

Significance and Use

The viscosity of a molten mold flux is a very important property for the correct functioning of a mold powder. This procedure is designed for producers and users of mold powders to develop the viscosity-temperature relationships of the molten mold flux for quality control or specification purposes, or both. Practice C 965 was developed for glasses that are significantly higher in viscosity than mold powders. Also, sample preparation is very different for the glass products covered.

Note 1—Warning: Use caution when discharging molten sample into water since this can cause an explosion.


flux; mold powder; refractories; viscosity; ICS Number Code 17.060 (Measurement of volume, mass, density, viscosity)

To find similar documents by ASTM Volume:

15.01 (Refractories, Activated Carbon; Advanced Ceramics)

To find similar documents by classification:

17.060 (Measurement of volume, mass, density, viscosity Including measuring instruments Volumetric measurements of petroleum products and natural gas, see 75.180.30)

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Document Number


Revision Level

1994 R05 EDITION



Modification Type


Publication Date

March 1, 2005

Document Type

Test Method

Page Count

3 pages

Committee Number