Graphite-Epoxy Motor

A Graphite-Epoxy Motor (GEM) is a high-performance, solid rocket motor, used for supplemental thrust on several launch vehicles, including the Boeing Delta II and Delta IV. They are designed to allow launch vehicles to deliver larger payloads to orbit. The name "Graphite-Epoxy Motor" refers specifically to solid motors produced by Alliant Techsystems, although boosters of similar construction are used on other launch vehicles.

Read more about Graphite-Epoxy Motor:  Background, Variants, Reliability

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Graphite-Epoxy Motor - Reliability
... Graphite-Epoxy Motors have proven themselves to be reliable however they are not infallible. 1997, a Delta II (Delta 241) exploded 13 seconds after launch due to a rupture in a graphite-epoxy casing ... The investigation team found the damage to the motor case to be caused by the stress induced by the supports which held the GEM during storage and transportation ...

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