NEMA grades C, and CE Canvas Cotton-Cloth Reinforced Phenolic -- natural color is typically light tan to brown. C and CE grades are composed of a continuous cotton woven cloth impregnated with a phenolic resin binder. These grades contain a medium weave canvas and are known primarily for their mechanical properties. These grades are not recommended for primary electrical insulation.

NEMA grades L and LE Linen Cotton-Cloth Reinforced Phenolic -- natural color is typically light tan to brown. This grade is composed of a continuous cotton woven cloth impregnated with a phenolic resin binder. This grade contains a fine weave linen and, like the canvas phenolic, is known for its mechanical properties.