Dielectrics

Sapphire is a gemstone variety of the mineral corundum, an aluminium oxide (α-Al2O3).

Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer of tetrafluoroethylene that has numerous applications.

Polyethylene (abbreviated PE) or polyethene (IUPAC name polyethene or poly(methylene)) is the most common plastic.

Poly(methyl methacrylate) (PMMA), also known as acrylic or acrylic glass as well as by the trade names Plexiglas, Acrylite, Lucite, and Perspex among several others (see below), is a transparent thermoplastic often used in sheet form as a lightweight or shatter-resistant alternative to glass.

Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications including packaging and labeling, textiles (e.g., ropes, thermal underwear and carpets), stationery, plastic parts and reusable containers of various types, laboratory equipment, loudspeakers, automotive components, and polymer banknotes.

Polyvinyl chloride, more correctly but unusually poly(vinyl chloride), commonly abbreviated PVC, is the world's third-most widely produced synthetic plastic polymer, after polyethylene and polypropylene.

Bakelite (/ˈbeɪkəlaɪt/ BAY-kə-lyt, sometimes spelled Baekelite), or polyoxybenzylmethylenglycolanhydride, is an early plastic.

A dielectric material (dielectric for short) is an electrical insulator that can be polarized by an applied electric field.

Nylon is a generic designation for a family of synthetic polymers, more specifically aliphatic or semi-aromatic polyamides.

Boron trioxide (or diboron trioxide) is one of the oxides of boron.

Electret (formed of elektr- from "electricity" and -et from "magnet") is a dielectric material that has a quasi-permanent electric charge or dipole polarisation.

Quartz is the second most abundant mineral in Earth's continental crust, after feldspar.

Formvar refers to any of several thermoplastic resins that are polyvinyl formals, which are polymers formed from polyvinyl alcohol and formaldehyde as copolymers with polyvinyl acetate.

Polymethylpentene (PMP), also known as Poly(4-methyl-1-pentene), is a thermoplastic polymer of 4-methyl-1-pentene.

Silicon dioxide, also known as silica (from the Latin silex), is a chemical compound that is an oxide of silicon with the chemical formula SiO2.

Yogo sapphires are a variety of corundum found only in Yogo Gulch, part of the Little Belt Mountains in Judith Basin County, Montana, United States, on land once inhabited by the Piegan Blackfeet people.