This is caused by a chemical reaction with elastomer to cause slight seal swell as specified by the manufacturer (OEM). Seal Swell Agents – Their express purpose is to swell elastomeric seals.These are also called boundary lubrication additives. Friction Modifiers – Minimises light surface contacts (sliding & rolling) that may occur in a given machine design.Thereby preventing metal to metal contact. Chemical reaction with metal surface forms a film with lower shear strength than the metal. Anti Wear & EP Agents – Designed to reduce friction & wear and prevent scoring & wear.Rust & Corrosion Inhibitors – Designed to prevent corrosion & rusting of metal parts in contact with the lubricant.Dispersants – One end of these additives are soluble in oil and the other attracts dirt, sludge & other contaminants & holds them in suspension in the oil.Detergents – Designed to keep surfaces free of deposits. ![]() The key additives of a lubricant/oil are: Or alternatively contact our technical team about scheduling a tailored training session for you and your team. There are a myriad of others, that if it is of interest to you, please sign up to our newsletter for more regular and detailed information. A fluid with high thermal stability will degrade less than a fluid with low thermal stability and will deliver a longer fluid life than a less stable fluid. As such, the maximum use temperature is the suggested maximum temperature to which the fluid can be heated before the fluid begins to break down or degrade at an appreciable rate. Thermal Stability – Thermal stability is defined as the ability of a fluid to resist breaking down under heat stress.The rate of oxidation doubles with every 10º C rise in temperature. Oxidation will lead to an increase in the oil’s viscosity and deposits of varnish and sludge. The rate of oxidation is accelerated by high temperatures, water, acids and catalysts such as copper. Oxidation Resistance – The ability of a lubricant to withstand the presence of oxygen.Because oil is hygroscopic, meaning that it absorbs water, this is a very important property of lubricating oils. Demulsibility – Demulsibility is the ability of a lubricant to release water and readily separate when mixed.Pour Point – The pour point of an oil is the lowest temperature at which it will pour when cooled under defined conditions. ![]() It is used to characterise viscosity changes with relation to temperature in lubricating oil. ![]() The lower the VI, the greater the change of viscosity of the oil with temperature and vice versa.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |