A new crystalline form of polyoxymethylene is described with an orthorhombic unit cell, space group P212121, and lattice constants a = 4.77 A., b = 7.65 A., c = 3.56 A. The chains are helicoidal with the axis of the helix parallel to c. The period of identity of 3.56 A. comprises two monomeric units and one turn of the helix. The lattice of orthorhombic polyoxymethylene is made up of isomorphous helicoidal chains.
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Carazzolo et al. (1963) studied this question.
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