Machinery Lubrication magazine published by Noria Corporation
Issue link: https://www.e-digitaleditions.com/i/756816
MAXIMUM OPERATING TEMPERATURE 200 ° F 93 °C 250 ° F 121 °C MAXIMUM OPERATING TEMPERATURE GROUP I POOR MODERATE BEST OXIDATION AND THERMAL STABILITY LOW VOLATILITY HYDROLYTIC STABILITY ADDITIVE SOLUBILITY BIODEGRADABILITY LOW-TEMPERATURE BEHAVIOR HIGH VISCOSITY INDEX SEAL COMPATIBILITY LOW COST GROUP II & GROUP III POOR MODERATE BEST POOR MODERATE BEST OXIDATION AND THERMAL STABILITY LOW VOLATILITY HYDROLYTIC STABILITY ADDITIVE SOLUBILITY BIODEGRADABILITY LOW-TEMPERATURE BEHAVIOR HIGH VISCOSITY INDEX SEAL COMPATIBILITY LOW COST POLYALPHAOLEFIN (SYNTHETIC) MAXIMUM OPERATING TEMPERATURE (CONTINUOUS) 270 ° F 132 °C POOR MODERATE BEST OXIDATION AND THERMAL STABILITY LOW VOLATILITY HYDROLYTIC STABILITY ADDITIVE SOLUBILITY BIODEGRADABILITY LOW-TEMPERATURE BEHAVIOR HIGH VISCOSITY INDEX SEAL COMPATIBILITY LOW COST SILICONES (SYNTHETIC) MAXIMUM OPERATING TEMPERATURE 450 ° F 232 °C produced in and around the machine. Heat may also be generated as a result of normal or abnormal conditions. Normal or expected condi- tions would include the machine's environment (production process and climate conditions), mechanical work realized by the machine, the combustion action in internal combustion machines and the internal fluid friction of the lubricant. Abnormal conditions would consist of an unusual mechanical issue, excessive loads or speeds, lubricant viscosity that is too low or high, and a deficient insulating material. Reasons for Choosing a High-temperature Lubricant Before beginning the lubricant selection process, it is important to consider the reason a high-temperature lubricant is desired or required. For instance, it may be a require- ment of the original equipment manufacturer (OEM). This means a particular brand or lubricant type has been tested by the OEM with approved results. In many cases, this is a condition for warranty, so it is advisable to use the recommended lubricant type. Also, always verify the operating conditions to ensure they are consistent with what is expected by the OEM. Another reason a high-temperature lubri- cant might be chosen is because of an abnormal machine condition. However, while a better performing lubricant may help miti- gate the problem, it is more imperative to correct the root cause of the issue. New operating conditions or the use of a new technology may also be motivation for Comparisons of Operating Temperature Ranges for Different Lubricant Base Stocks