Steel chains must be "oil coated" to ensure lasting strength and rust-free delivery. Until about two yearsago the chains were immersed in a steam heated tank containing a light oil at about 90°F. The initial results were good, but this low viscosity oil tended to drain away from the journals during warehousing. Corrosion became an increasing problem as storage time lengthened. Also, the oil's value as an initial lubrication decreased. A more viscous oil was the answer because it would not drain off. However, for proper application and good penetration it had to be heated to about 200°F. This higher temperature could not be obtained with steam in the existing tank.

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