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The stage of curing of a polymer resin where the polymer is still of relatively low molecular weight and thus both readily soluble and fusible.
An early stage of polymerization of thermosetting resins in which the material is still soluble in certain liquids and fusible. (See also B-stage, C-stage.)
This is a very early stage in the reaction of certain thermosetting resins where the molecular weight is low and the resin is still soluble in some liquids and still fusible.