Oilproof

Oilproof is a descriptive term used to characterize materials or finishes that resist permeation, staining, or degradation by oils. It is not a single standardized specification, but rather a property applied across industries such as textiles, packaging, and coatings to indicate oil resistance in varying degrees depending on formulation and conditions.

In textiles, oilproof fabrics are treated with coatings, finishes, or impregnations that reduce oil absorption, helping fabrics resist staining and allow easier cleaning. In packaging and paper, oilproof materials such as treated papers or laminates resist grease from food products or lubricants, helping maintain integrity and appearance. In coatings and composites, oilproof barriers may consist of silicone, fluoropolymer, or epoxy-based layers that limit oil permeation while allowing mechanical performance.

Practically, oilproof performance depends on the type of oil, temperature, immersion time, and mechanical wear. Treatments can be waxes, silicones, fluorinated polymers, or multi-layer laminates. Oil resistance is typically tested by exposing the material to a reference oil and observing oil beading, absorption, or penetration, often summarized by a duration or contact angle metric. Some materials may be oilproof but not waterproof, and vice versa.

Oilproof is related to or overlaps with terms such as oil resistance, oleophobicity, and greaseproof, though each term has distinct emphasis. The exact meaning of oilproof can vary by industry, product standard, and application, so specifications should be consulted for performance guarantees.