WCO Explanatory Notes reproduced for reference. © World Customs Organization. Verify against official WCO publication.
38.12 - Prepared rubber accelerators; compound plasticisers for rubber or plastics, not elsewhere specified or included; anti-oxidismg preparations and other compound stabilisers for rubber or pIastics. 3 8 12.10 - Prepared rubber accelerators 38 12.20 - Compound plasticisers for rubber or plastics 3812.30 - Anti-oxidising preparations and other compound stabilisers for rubber or plastics For the purpose of this heading, the terms " compound ", " prepared " and " preparation include : " (i) deliberate mixtures and blends; and (ii) reaction mixtures including roducts produced from a homologous series such as fatty acids or fatty alcohols of hea ing 38.23. 'I' (A) Prepared rubber accelerators. This category covers products which are added to rubber rior to vulcanisation to give the vulcanised articles better physical properties and reduce tl!te time and tempnature required for the iulcanising process. They sometimes also serve as plasticisers. This heading covers only such products which are mixtures. These preparations are general1 based on organic products (diphenylgwmidine, dithiocarbamates, thiurarn sulphi$es, hexamethylenetetramine, mercaptobenzothiazole, often combined with inorganic activators (zinc oxide, magnesium oxide, Iead oxide, (B) Compound plasticisers for rubber or plastics, not elsewhere specified or included. This category covers compound plasticisers which are used to provide a desired de ee of flexibility to plastics or to increase the plastici of the rubber mix. Examples o these types of products include deliberate mixtures o two or more hthalate esters as well as m~xeddialkyl phthalates produced from mixed fatty alcohols of eading 38.23. Plasticisers are used extensively with poly(viny1 chloride) and with cellulose esters. F YI The heading does not cover products y e d as or sometimes called plasticisers, which are more s eclfically covered by some other headtng of the NomencIature (see the exclusions at the end of s Explanatory Note). & (C) Anti-oxidising preparations and other compound stabilisers for rubber or plastics. This category covers anti-oxidising preparations for rubber or plastics (used, for example, in rubber manufacture to prevent hardening or ageing), such as mixed alkylated diphenylamines and preparations based on N-naphthylaniline. This category also covers other compound stabilisers for rubber or plastics. Examples of this type of product include deliberate mixtures of two or more stabilisers as well as reaction mixtures such as mixed organotin compounds obtained from mixed fatty alcohols of headin 38.23. The main use of compound stabilisers for plastics is to inhibit the dehydroch orination of certain polymers such as poly(viny1 chloride). They may also be used as heat stabilisers for polyamides. f The heading excludes : (a) Petroleum oils, petroleumjelly, paraffin waxes and asphalts of Chapter 27. (b) Separate chemically defined compounds of Chapter 28 or 29, e.g., dioctyl phthalate. (c) Anti-oxidants pre ared as additives for mineral oils or for other liquids used for the same purposes as mineral oils (hen&na 38.11). (d) Peptisers for rubber processing, though known as chemical plasticisers (generally heading 38.24). (e) Polymers of Chapter 39.
1.- This Chapter does not cover : (a) Separate chemically defined elements or compounds with the exception of the following : (1) Artificial graphite (heading 38.01); (2) Insecticides, rodenticides, fungicides, herbicides, anti-sprouting products and plant-growth regulators, disinfectants and similar products, put up as described in heading 38.08; (3) Products put up as charges for fire-extinguishers or put up in fire-extinguishing grenades (heading 38.13); (4) Certified reference materials specified in Note 2 below; (5) Products specified in Note 3 (a) or 3 (c) below; (b) Mixtures of chemicals with foodstuffs or other substances with nutritive value, of a kind used in the preparation of human foodstuffs (generally heading 21.06); (c) Products of heading 24.04; (d) Slag, ash and residues (including sludges, other than sewage sludge), containing metals, arsenic or their mixtures and meeting the requirements of Note 3 (a) or 3 (b) to Chapter 26 (heading 26.20); (e) Medicaments (heading 30.03 or 30.04); or (f) Spent catalysts of a kind used for the extraction of base metals or for the manufacture of chemical compounds of base metals (heading 26.20), spent catalysts of a kind used principally for the recovery of precious metal (heading 71.12) or catalysts consisting of metals or metal alloys in the form of, for example, finely divided powder or woven gauze (Section XIV or XV). 2.- (A) For the purpose of heading 38.22, the expression “certified reference materials” means reference materials which are accompanied by a certificate which indicates the values of the certified properties, the methods used to determine these values and the degree of certainty associated with each value and which are suitable for analytical, calibrating or referencing purposes. (B) With the exception of the products of Chapter 28 or 29, for the classification of certified reference materials, heading 38.22 shall take precedence over any other heading in the Nomenclature. 3.- Heading 38.24 includes the following goods which are not to be classified in any other heading of the Nomenclature : (a) Cultured crystals (other than optical elements) weighing not less than 2.5 g each, of magnesium oxide or of the halides of the alkali or alkaline-earth metals; (b) Fusel oil; Dippel's oil; (c) Ink removers put up in packings for retail sale; (d) Stencil correctors, other correcting fluids and correction tapes (other than those of heading 96.12), put up in packings for retail sale; and (e) Ceramic firing testers, fusible (for example, Seger cones). 4.- Throughout the Nomenclature, “municipal waste” means waste of a kind collected from households, hotels, restaurants, hospitals, shops, offices, etc., road and pavement sweepings, as well as construction and demolition waste. Municipal waste generally contains a large variety of materials such as plastics, rubber, wood, paper, textiles, glass, metals, food materials, broken furniture and other damaged or discarded articles. The term “municipal waste”, however, does not cover : (a) Individual materials or articles segregated from the waste, for example wastes of plastics, rubber, wood, paper, textiles, glass or metals, electrical and electronic waste and scrap (including spent batteries) which fall in their appropriate headings of the Nomenclature; (b) Industrial waste;