| 摘要 |
Lubricating compositions comprising a colour temperature indicator are disclosed. The compositions irreversibly change their colour when exposed to temperatures exceeding a predetermined limit temperature. The compositions comprise, as an essential component, from 0.2 to 4% by weight of metal dithiocarbamates or dialkyldithiocarbamates, preferably of antimony and/or lead in combination with a dye, preferably a blue dye, in an amount of from 50 to 2000 ppm. Other components, such as epoxy resins, may be also present, to increase and/or extend the range of temperatures in which the changes of colour are observed. The compositions are useful as indicators of overheating of lubricated elements under severe operating conditions.
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