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27.11 ‑ Petroleum gases and other gaseous hydrocarbons.
This heading covers crude gaseous hydrocarbons obtained as natural gases or from petroleum, or produced chemically. Methane and propane are, however, included even when pure.
These hydrocarbons are gaseous at a temperature of 15 °C and under a pressure of 1,013 millibars (101.3 kPa). They may be presented under pressure as liquids in metal containers and are often treated, as a safety measure, by the addition of small quantities of highly odoriferous substances to indicate leaks.
They include, in particular, the following gases, whether or not liquefied :(Ⅰ) Methane and propane, whether or not pure. (Ⅱ) Ethane and ethylene less than 95 % pure. (Ethane and ethylene not less than 95 % pure fall in heading 29.01.) (Ⅲ) Propene (propylene) less than 90 % pure. (Propene not less than 90 % pure falls in heading 29.01.) (Ⅳ) Butane containing less than 95 % of n‑butane and less than 95 % of isobutane. (Butane containing not less than 95 % of n‑butane or isobutane falls in heading 29.01.) (Ⅴ) Butenes (butylenes) and butadienes less than 90 % pure. (Butenes and butadienes not less than 90 % pure fall in heading 29.01.) (Ⅵ) Intermixtures of propane and butane.
The above percentages are calculated by reference to volume for gaseous products and to weight for liquefied products.
The heading does not cover :(a) Separate chemically defined hydrocarbons (other than methane and propane) in a pure or commercially pure state (heading 29.01). (As regards such hydrocarbons with added odoriferous substances, see the General Explanatory Note to Chapter 29, Part (A), fifth paragraph. For ethane, ethylene, propene, butane, butenes and butadienes, there are specific purity criteria as indicated in paragraphs II, III, IV and V above.) (b) Liquefied butane in containers of a kind used for filling or refilling cigarette or similar lighters and of a capacity not exceeding 300 cm3 (other than those constituting parts of cigarette or similar lighters) (heading 36.06). (c) Cigarette or other lighter parts containing liquefied butane (heading 96.13).
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