Explanatory notes
… polyesters : 3907.91 ‑ ‑ Unsaturated 3907.99 ‑ ‑ Other This heading covers : (1) Polyacetals . Polymers obtained from … is regarded as engineering plastics, being used for ring bearings, cams, automobile instrument housings, doorknobs, … predominantly of hexoses or compounds which can be easily split into hexoses, e.g., sugars, molasses, sugar …