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Settala pure hydrocarbons - Reasons why

settala gas

Hydrocarbons are organic compounds in which carbon atoms are joined to hydrogen atoms by covalent bonds. Hydrocarbons are part of the organic compounds without functional group and are characterised only by hydrogen and carbon. As the number of carbon atoms in the molecular structure increases, different formulas of hydrocarbon compounds are obtained.

Gas purity - Definition

The gas purity is an indication of the degree of concentration of the substance itself and consequently of the amount of other foreign substances considered as impurities. The higher the purity, the lower the concentration of other pollutants. A pure gas is considered to be of better quality than one containing a certain degree of impurities and is therefore more expensive. The degree of gas purity is expressed as a percentage of the number of moles of gas in relation to the total number of moles and is commercially referred to as the "gas title". It is a value expressed as a percentage. This value is also a way of classifying gases and according to purity, a distinction is made between:

  • Technical gases with a purity between 95% and 99%;
  • Pure gases with a purity between 99% and 99.99%;
  • Ultra-pure gases with purity higher than 99.99%.

Gas impurity – Definition

Every gas, however pure it may be, contains impurities within it, substances that may be present in the raw materials from which they are produced or from external contamination that occurs during the production or purification process of the gases themselves.

Some of the most common impurities are traces of moisture, oxygen, nitrogen, carbon monoxide and carbon dioxide.

Depending on the order of magnitude and quantity present, different units of measurement in terms of mass, volume or mole indicate impurities. The units usually used are parts per million and parts per billion.

In accordance with the above, in order to optimise a specific application of great importance, it is essential to choose the most suitable gas (its degree of purity) and to be aware of any impurities that could, in turn, affect the performance of the gas itself.

Settala Gas pure hydrocarbons – Reasons why

For over 40 years, Settala Gas has specialised in the production of pure hydrocarbons with a minimum purity of 99.5%, such as the refrigerant gases in the PURI|FRIGOR range.

The range of pure hydrocarbon gases offered by our company goes from 99.5% to 99.999% purity.

Some examples of pure hydrocarbon gases used for refrigeration are:


Propane with a minimum purity of 99.5%. It is used for medium and low temperature refrigeration systems.


This is a very efficient natural refrigerant, used in very modern and light industrial and domestic refrigeration systems. R600a is called isobutane, with a minimum purity of 99.5%.


R1270 refers to as 99.5% pure propylene/propene (C3H6). It is usually used in low-temperature refrigeration systems as a substitute for R22 and R502.

Today, hydrocarbons form the basis of industrial organic chemistry processes and in particular, petrochemistry, which provides indispensable products for many sectors (plastics, pharmaceuticals and agricultural products). Using the pure hydrocarbon gases offered by Settala Gas means being able to count on a quality product, specifically designed to meet the specific needs of the customer.