Kydex

Kydex is the brand name for a family of thermoplastic sheets used in thermoforming and fabrication. The material is an acrylic-based polymer blend, commonly including polyvinyl chloride (PVC) and acrylic components, produced in a range of thicknesses and finishes. Kydex sheets are valued for rigidity, dimensional stability, chemical resistance, and a non-porous surface that accepts paints and coatings.

The sheets are heated to become pliable and then formed around a mold or item, after which cooling hardens the shape. This heat-forming process enables precise retention, complex geometries, and repeatable results. Once formed, items can be reinforced with rivets, screws, snaps, or adhesives. The material can be reheated and reshaped to adjust retention or modify the design.

Common uses include firearm holsters, belt attachments, magazine pouches, knife and tool sheaths, and other tactical gear. It is also used for protective cases, instrument panels, and decorative or industrial parts due to its texture and color options.

Advantages include strong impact resistance, rigidity, chemical and moisture resistance, easy cleaning, and the ability to be cut, drilled, stitched, or machined. Limitations include cost relative to some other plastics, heavier weight, potential brittleness at very low temperatures, and the need for proper ventilation when heated.

A note on variants: Kydex sheets come in a variety of thicknesses, textures, and colors; they can be cut or edged and finished with heat treatments to adjust retention.