Some of the more viscous crude oils obtained in the United States are employed as lubricants under the name of " natural oils," either without any treatment or after clarification by subsidence and filtration through animal charcoal.
Graphite is used for the manufacture of pencils, dry lubricants, grate polish, paints, crucibles and for foundry facings.
There is a great variety in the grades of oils produced in the state, ranging from the heavy asphaltic oils of the Popo Agie and Lander fields to the high-grade lubricants and superior light products obtained from the wells in the Douglas, Salt Creek and Uinta county fields.
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