3.A.3.Rocket motor cases, insulation components and nozzles for solid propellant or hybrid rocket motors usable in the subsystems specified in 2.A.1.c.1. or 20.A.1.b.1.

N.B. For insulation material in bulk or sheet form, see Item 3.C.2.
Note:
In Item 3.A.3., insulation intended to be applied to the components of a rocket motor, i.e. the case, nozzle inlets, case closures, includes cured or semi-cured compounded rubber components comprising sheet stock containing an insulating or refractory material. It may also be incorporated as stress relief boots or flaps.