Moyerite (synthetic) was a semi-solid propellant used by Federation ships for their ullage thruster devices and emergency jettison thrusters. The propellant had an extremely fast ignition rate. It also had a relatively low specific impulse (450 isp) and a shelf life in excess of ten standard years without a significant deterioration of performance. In 2367, this propellant was stored on aboard the Federation starship USS Enterprise-D.
In that year, moyerite (synthetic) was on a list of explosives that Lieutenant Commander Data and Counselor Deanna Troi searched through in an attempt to find one that could produce enough energy to release the USS Enterprise-D and an alien ship from the Tyken's Rift. (TNG: "Night Terrors")