In industry many Grease Lubricant manufacturers classified their product into 6 basic categories based on application on work and substance that incorporated the grease. Examples of types : mixtures of mineral oils and solid materials, heavy asphaltic-type oils blended with lighter oils, extreme-pressure greases, roll-neck greases, soap-thickened mineral oils and multi-purpose grease.
MINERAL OILS MIXED WITH SOLIDS
These types of grease lubricants are very heavy lubricants for specialized functions. Such greases lubricate rough-fitting machine components working under heavy pressures or loads at comparatively slow speeds. Instances of machines that will typically use this type of grease include concrete mixers, bearings and rollers on conveyors and heavy construction machines.
HEAVY ASPHALTIC-TYPE OILS BLENDED WITH LIGHTER OILS
These types of lubricants are categorized as greases but are in fact thick, heavy oils used to lubricate open-type gearing and wire rope. A main benefit of these oils is that they form a heavy protective film while heated or painted on surfaces and then able to cool. Lighter oil is typically combined with the heavy oils in order to improve the pour level of the oil.
EXTREME-PRESSURE GREASES
The unique feature of this type of grease is that it contains additives to improve firm strength under different applications. In substance, film strength provides the resistance of the lubricant to being torn apart, thus preventing metal-to-metal contact of the apparatus being lubricated. A film is developed by a chemical reaction of the metal to the additives in the grease. The chemical reaction is usually brought about (or accelerated) by stress exerted on the grease, creating heat.
A number of of the additives applied in EP greases include compounds containing parts of chlorine, phosphorus, active and/or passive sulfur, chlorinated waxes and phosphates. Zinc and lead can also be incorporated, as well as asbestos in some lubricants as a filler to cushion the shock loading on gear drives. The particular additive being used will always rely on the application for use. Factors to be considered for types of additives include specific equipment operating circumstances such as load, speed, surface condition and inherent design characteristics.
ROLL NECK GREASES
Roll neck greases are specialized lubricants used almost exclusively for lubricating plain bearings in rolling equipment. For instance, it’s fairly common to use a block of NLGI No. 6 grease, which has the consistency of a bar of soap, carved to mate with the shape required to accommodate the bearing of heavily loaded equipment.
SOAP THICKED MINERAL OILS
This is by far the most extensively used category of grease in industry today. This type of grease varies by the additive that creates the soap in the lubricants chemical makeup. Sodium-base greases are also general-purpose greases. Since they have a higher dropping level (approximately 300o to 350ºF), they are frequently used to lubricate machine components running near heat. Sodium greases produced with lighter oils are used for ball and roller bearing lubrications, as are combinations (mixed base) of calcium and sodium grease Grease can be classified into 6 basic categories or types; i. e., mixtures of mineral oils and solid materials,heavy, asphaltic-type oils blended with lighter oils, extreme-pressure greases, roll-neck greases,soap-thickened mineral oils and multi-purpose grease.
MINERAL OILS MIXED WITH SOLIDS
These types of greases are very heavy lubricants for specialized functions. Such greases lubricate rough-fitting machine components working under heavy pressures or loads at comparatively slow speeds. Instances of machines that will typically use this type of grease include concrete mixers, bearings and rollers on conveyors and heavy construction machines.
HEAVY ASPHALTIC-TYPE OILS BLENDED WITH LIGHTER OILS
These types of lubricants are categorized as greases but are in fact thick, heavy oils used to lubricate open-type gearing and wire rope. A main benefit of these oils is that they form a heavy protective film while heated or painted on surfaces and then able to cool. Lighter oil is typically combined with the heavy oils in order to improve the pour level of the oil.
EXTREME-PRESSURE GREASES
The unique feature of this type of grease is that it contains additives to improve firm strength under different applications. In substance, film strength provides the resistance of the lubricant to being torn apart, thus preventing metal-to-metal contact of the apparatus being lubricated. A film is developed by a chemical reaction of the metal to the additives in the grease. The chemical reaction is usually brought about (or accelerated) by stress exerted on the grease, creating heat.
A number of of the additives applied in EP greases include compounds containing parts of chlorine, phosphorus, active and/or passive sulfur, chlorinated waxes and phosphates. Zinc and lead can also be incorporated, as well as asbestos in some lubricants as a filler to cushion the shock loading on gear drives. The particular additive being used will always rely on the application for use. Factors to be considered for types of additives include specific equipment operating circumstances such as load, speed, surface condition and inherent design characteristics.
ROLL NECK GREASES
Roll neck greases are specialized lubricants used almost exclusively for lubricating plain bearings in rolling equipment. For instance, it’s fairly common to use a block of NLGI No. 6 grease, which has the consistency of a bar of soap, carved to mate with the shape required to accommodate the bearing of heavily loaded equipment.
SOAP THICKED MINERAL OILS
This is by far the most extensively used category of grease in industry today. This type of grease varies by the additive that creates the soap in the lubricants chemical makeup. Sodium-base greases are also general-purpose greases. Since they have a higher dropping level (approximately 300o to 350ºF), they are frequently used to lubricate machine components running near heat. Sodium greases produced with lighter oils are used for ball and roller bearing lubrications, as are combinations (mixed base) of calcium and sodium grease
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