Kydex is made from thermoplastic acrylic-polyvinyl chloride materials. It is a kind of plastic that, when heated, becomes pliable and malleable. Kydex is also known as thermoform plastic. Kydex is one of the thermoplastic brands available in the market today. It is manufactured by a company called Sekisui SPI who also owns the Allen Thermoplastics brand. Kydex has a wide variety of uses and is used in a wide range of industries. Its most common applications are firearm holsters and knife sheaths. Thermoplastic combines the properties of acrylic and polyvinyl chloride. Acrylic provides rigidity and formability, while the polyvinyl component offers toughness, resistance to chemicals, and a good interior finish. The temperature needed to heat the thermoplastic into a pliable form depends on the thickness. Kydex usually comes in thicknesses ranging from 0.06 to 0.125 inches. It usually starts from 330 F and should not go beyond 400 F. When a Kydex sheet is heated to these temperatures, it can be formed around a mold or any hard object you want to encase. When it cools down, it will take the shape of the mold or the object.