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PRECISION PETROLEUM TESTING INSTRUMENTS

Lubricants

D892 Foam Test — Ceramic or Metal Diffuser?

Although the method allows both a circular, Norton ceramic (stone) diffuser and a Mott cylindrical metal diffuser, there are advantages and disadvantages to each. The stone diffuser was used for many years before the introduction of the metal diffuser. Both need to meet certification requirements but the metal diffuser is much more uniform, easier to […]

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Water Separability Paddle Cleanliness

With all the concern for cleanliness of the glassware for this ASTM D1401 test, it was recently discovered that the paddle itself may cause cleanliness problems. Most paddles are soldered to the shaft. It is unclear how to thoroughly clean soldered edges. To eliminate any possibility of impurities, the paddle and shaft should be one […]

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Temperature Stability is Critical for ASTM D445 Kinematic Viscosity

Temperature control is the single most important parameter for obtaining accurate and precise kinematic viscosity measurements. For petroleum products even more so, as their rate of viscosity change per unit of temperature is significantly greater than other types of materials. Thus, a slight variation in temperature can have a very large effect on the viscosity […]

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Kinematic Viscosity Testing Advice for ASTM D445 KV Test

The entire length of the viscometer must be maintained at the appropriate temperature. The type of circulator used, the age of the bath fluid, and the bath fluid viscosity will impact temperature uniformity. The circulator and the viscosity of the KV bath fluid need to be balanced to provide a uniform temperature throughout the bath. […]

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