Air bubbles can be eliminated by treatment with an ultrasonic bath. Viscosity measurement according to ASTM D7042 requires homogeneous and bubble-free samples. A series of interlaboratory studies conducted by ASTM yields the bias corrections for various materials (including formulated oils, diesel, jet, and residual fuels) and temperatures.Īpart from the bias corrections, the results of the interlaboratory studies showed that measurement repeatability and reproducibility of ASTM D7042 are equal or comparable to ASTM D445.Ĭonsequently, ASTM D7042 is being referenced as an accepted alternative to ASTM D445 in many standards and specifications. The result obtained according to ASTM D7042 is designated by the acronym X, and the corrected kinematic viscosity by the acronym Y. The mathematical conversion formula between the two standard methods is described as follows: The kinematic viscosity values obtained with the test method ASTM D7042 are equivalent to ASTM D445, as long as the appropriate bias correction is applied. Viscosity standards are sold in 500 mL bottles.ASTM D445 describes the standard measurement procedure for the kinematic viscosity measurement of petroleum products by using glass capillaries. Silicone viscosity standards are not recommended for glass capillary viscometers (including vacuum viscometers), metal cup-type viscometers (such as ISO, Zahn, Ford and Shell cups), or any other viscometers providing kinematic viscosity-CANNON hydrocardon-based oil standards should be used for these types of viscometers.ĬANNON silicone viscosity standards are specifically formulated for use with rotational viscometers. CONTAINER SIZESĪll standards are shipped with an expiration date between 18 and 24 months from the date the order is processed.ĬANNON silicone viscosity standards are intended for use with rotational viscometers only. For additional details see Quality Certifications. CANNON performs calibrations using the master viscometer procedures detailed in ASTM D2162. ISO/IEC 17025 accreditation further demonstrates our technical competence in calibration including the determination of kinematic and dynamic viscosity of standards as well as viscosity certification of customer samples. CANNON Instrument Company holds ISO 17025 and Guide 34 accreditation (certificates 1262.02) from A2LA for competency in manufacture and certification of reference materials. national standards for certified liquid viscosity reference standards in 2003.Īll CANNON viscosity standards are traceable to a NIST calibration and prepared in our ISO 9001-registered, A2LA-accredited laboratory. This is why the National Institute of Standards and Technology (NIST) delegated responsibility to CANNON for U.S. Use of high quality standards and reference materials ensures test reliability and accuracy. Our standards calibrate and verify the performance of glass capillary viscometers, automated kinematic viscometers, rotational viscometers, falling ball viscometers, cup viscometers, tapered bearing simulator viscometers and flash point testers. CANNON Instrument Company has been a leader in viscosity measurement since 1938, providing a broad range of viscosity standards and flash point reference materials to customers across various industries.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |