Uncoated

Uncoated describes a surface that lacks any applied coating, film, or finish. It implies that the material’s inherent properties—such as texture, color, porosity, and surface energy—are visible and controlling. Uncoated surfaces can be desirable for certain tactile or functional reasons, but they also expose the material more directly to wear, moisture, or contamination.

In paper products, uncoated paper has no surface film and tends to be more porous, absorbing ink and appearing softer or more textured. It often provides a lower glare and a warmer feel, making it common for books, letterhead, notebooks, and some packaging. The tradeoffs include reduced water resistance, more show-through from printing on the reverse side, and generally less brightness or opacity than coated papers. Uncoated papers are typically easier to recycle and may be less expensive.

For metals and alloys, uncoated metal means the base material without protective layers such as paint, varnish, plating, or oxidation control treatments. Bare metal is more susceptible to corrosion or tarnish in many environments but can be preferred when coatings would interfere with electrical conductivity, heat dissipation, machining, or aesthetics. Finishes or sealants are often applied later to improve durability, corrosion resistance, or appearance.

Uncoated also applies to other materials, including wood, plastics, and textiles, to describe surfaces without protective films or finishes. Such surfaces can offer desirable feel, chemical compatibility, or cost advantages but may require sealing, polishing, or maintenance to protect against wear, staining, or environmental exposure.

Overall, choosing uncoated versus coated depends on performance needs, cost, and the intended environment.