<p>There is provided a pack comprising a polymeric material having a melt viscosity (MV) in the range 0.05 to 0.12 kNsm -2 wherein said polymeric material is of a type which includes:
(a) phenyl moieties;
(b) carbonyl moieties; and
(c) ether moieties. Preferably the polymeric material is selected from polyetheretherketone and polyetherketone. Such low Mv materials may be injection moulded or extruded to produce thin walled components; or used as components of highly filled compositions.</p>