十堰郧阳区丹江口壳牌液压油-导热油直营高使用温度是指某产品经热稳定性试验测得变质率不大于10%所对应的温度，即加热器出口处测得的主流体最高平均温度。在实际使用中，加热器出口处测得的主流体平均温度应较其最高使用温度至少低20℃。经评定,L-QB热传导液最高使用温度为300℃,L-QC热传导液最高使用温度为320℃,L-QD热传导液最高使用温度为350℃High operating temperature refers to the temperature corresponding to a product with a deterioration rate of no more than 10% measured through thermal stability testing, which is the highest average temperature of the main fluid measured at the outlet of the heater. In practical use, the average temperature of the main fluid measured at the outlet of the heater should be at least 20 ℃ lower than its maximum operating temperature. After evaluation, the maximum operating temperature of L-QB heat transfer fluid is 300 ℃, the maximum operating temperature of L-QC heat transfer fluid is 320 ℃, and the maximum operating temperature of L-QD heat transfer fluid is 350 ℃