HEADING 39.02 - POLYMERS OF PROPYLENE OR OF OTHER OLEFINS IN PRIMARY FORMS.

21 COMMODITIES

3902.10 - Polypropylene

3902.20 - Polyisobutylene

3902.30 - Propylene copolymers

3902.90 - Other

This heading covers polymers of all olefins (i.e. acyclic hydrocarbons having one or more double bonds) except ethylene. The important polymers of this heading are polypropylene polyisobutylene and propylene copolymers. For the classification of polymers (including copolymers) chemically modified polymers and polymer blends see the General Explanatory Note to this Chapter.

The general physical properties of polypropylene are similar to those of high-density polyethylene. Polypropylene and propylene copolymers also have a very wide range of applications for example packaging film moulded parts for automobiles appliances housewares etc. wire and cable coating food container closures coated and laminated products bottles trays and containers for storing precision equipment ducting tank linings piping for chemical plant tufted carpet backing.

Polyisobutylene when sufficiently polymerised resembles rubber but is not classified in CHAPTER40 as it does not conform to the definition of synthetic rubber. It is used for waterproof coatings and for modifying other plastics.

Polyisobutylene slightly polymerised and meeting the requirements of Note 3 (a) to this Chapter is also included in this heading. It is a viscous liquid used to modify the properties of lubricating oils.

The heading however does not cover liquid synthetic polyisobutylene or other liquid synthetic polyolefins not meeting the requirements of Note 3 (a) to this Chapter (heading 27.10).