Poly(hydridocarbyne) (PHC) is one of a class of carbon-based random network polymers primarily composed of tetrahedrally hybridized carbon atoms, each having one hydride substituent, exhibiting the generic formula [HC]n. PHC is made from bromoform, a liquid halocarbon that is commercially manufactured from methane.

), forming a colloidal suspension that is clear and non-viscous, which may then be deposited as a film or coating on various substrates.

Upon thermolysis in argon at atmospheric pressure and temperatures of 110 °C to 1000 °C, decomposition of poly(hydridocarbyne) results in hexagonal diamond (lonsdaleite).

More recently poly(hydridocarbyne) has been synthesized by a much simpler method using electrolysis of chloroform (May 2008)[1] and hexachloroethane (June 2009).

[2] The novelty of PHC (and its related polymer poly(methylsilyne)) is that the polymer may be readily fabricated into various forms (e.g. films, fibers, plates) and then thermolyzed into a final hexagonal diamond ceramic.