Polydicyclopentadiene (PDCPD) is a polymer material which is formed through ring-opening metathesis polymerization[2](ROMP) of dicyclopentadiene (DCPD).

PDCPD is frequently used in the automotive industry to make body panels, bumpers, and other components for trucks, buses, tractors, and construction equipment.

PDCPD is being investigated for the creation of porous materials for tissue engineering or gas storage applications, as well as for self-healing polymers.

[3] Polymerization can be achieved through the use of different transition metal catalysts as ruthenium, molybdenum, tungsten, and titanium, as well as under metal-free conditions through photoredox catalysis.

While the crosslinked polymer may arise from the metathesis of both alkenes in the parent monomer, it has been suggested that much polymerization conditions result in only the strained norbornene ring in the monomer undergoing olefin metathesis while subsequent crosslinking steps result from thermal condensation of the remaining olefins in the linear polymer.

The 1:1 volume ratio for DCPD molding is not critical since this is not a combination of two different chemical elements to form a specific matrix.

DCPD resins are transformed using high pressure RIM equipment as used in the polyurethane industry, with some small changes to be considered.

Because the resins shrink approximately 6% in volume during reaction, these presses (also called clamping units) do not have to handle high pressures, such as for sheet molding compound (SMC) or expanding polyurethane.