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Bright Stock
Viscosity: Highly viscous; check with individual manufacturers for specific viscosity
Remarks: Bright stock is a lubricating oil of high viscosity, obtained from residues of petroleum distillation. Used for blending with neutral oils in preparing automotive engine lubricating oils.
Pump Notes: Cast iron construction is satisfactory. Buna n is usually suitable for elastomers. Packing must be used due to viscosity.