What do you mean by dropping point?
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What do you mean by dropping point?
The dropping point is the temperature at which the first drop of a molten substance precipitates from a standardized cup with a defined orifice under controlled testing conditions in a furnace. The drop point is a suddenly occurring event, as the liquefied drop is accelerated by gravity as it escapes the cup.
What is drop melting point?
The melting point is the temperature at which the solid phase changes to the liquid state. Such accurate data is associated with the equally important, but more empirical, thermal characteristic: dropping or softening point of industrial or naturally-occurring products.
Is drop point and melting point same?
February 17, 2017 – Dropping Point Refers to the temperature observed in a laboratory test where a small quantity of lubricating grease is heated until a drop of material separates from the grease. That temperature is adjusted according to ASTM D 2265. The dropping point is not the melting point of lubricating grease.
What is high temp grease?
WD-40 Specialist® High-Temp Grease is a lithium-based grease built to perform in high temperatures and high-friction mechanical loads. It was engineered to meet the demands of protecting high-speed bearings in applications involving high temperatures and heavy mechanical loads.
What is pour point of lubricating oil?
In lubrication: Pour point. The pour point, or the temperature at which a lubricant ceases to flow, is important in appraising flow properties at low temperature. As such, it can become the determining factor in selecting one lubricant from among a group with otherwise identical properties.
How is grease hardness measured?
The Worked penetration and NLGI number (sometimes called “NLGI grade”) expresses a measure of stiffness or relative hardness of a grease used for lubrication. A high value for the worked penetration (or low NLGI number) means the grease is more fluid and will easier run from the bearings.
What is moly in grease?
Molybdenum Disulfide, simply known as Moly, is used both independently as a dry lubricant and as an additive in lubricating greases. Dry lubricants reduce friction between two sliding surfaces without the need for an oil medium.
What does NLGI stand for?
National Lubricating Grease Institute
Traditionally, a grease’s stiffness is indicated by its penetration value and is evaluated using the standardized National Lubricating Grease Institute (NLGI) grade chart. The NLGI number is a measure of the grease’s consistency as indicated by its worked penetration value.
Why is pour point important?
Pour point indicates a liquid’s lower temperature properties. If the surrounding temperature is less than the pour point, it cannot be transferred through a pipeline. Pour point is more significant for Lubricating oils. Pour points provide the lowest temperature for that fluid at which it can transfer by pouring.
What does high pour point mean?
It is defined as the minimum temperature in which the oil has the ability to pour down from a beaker. In crude oil a high pour point is generally associated with a high paraffin content, typically found in crude deriving from a larger proportion of plant material.
What is the viscosity of grease?
Grease is usually lithium, with a normal viscosity of 100 centistokes. This typically has a maximum operating temperature of 121 C (250 F), but it is usually limited to a service temperature of 93 C (200 F).
How can you tell the quality of grease?
Best Methods for Analyzing Grease
- Atomic Emission Spectroscopy.
- Particle Quantifier Index.
- Fourier Transform Infrared Spectroscopy.
- Karl Fischer Titration.
- Bleeding Test.
- Penetration Test.
- Sulfate Ash.
- Shear Stress, Visible Viscosity.
Is melting point same as boiling point?
The main difference between boiling point and melting point is that the melting point is defined as the temperature at which solid and liquid phases are in equilibrium, whereas the boiling point is the temperature at which the vapour pressure of a liquid is equal to the external pressure.
What causes high melting point?
High melting point metals have strong intermolecular forces between atoms. Electrostatic attraction forces between metal ions and free electrons create strong metallic bonds with stronger bonds resulting in higher melting temperatures.
What does melting point tell you about purity?
Impurities, even when present in small amounts, usually lower the melting point and broaden the melting point range. A wide melting point range (more than 5°C) usually indicates that the substance is impure; a narrow melting point range (O. 5-2°C) usually indicates that the substance is fairly pure.
What is CV grease?
CV Grease (Constant Velocity Joint Grease) is a Lithium based No 2 grease with a Molybdenum Disulphide additive package. Granville CV grease is specifically designed for use in most modern constant velocity joints found on trucks, vans and cars. Ideal for CV joints, universal joints and wheel bearings.
