BS ISO 20463:2018 pdf free.Rubber and rubber products一Determination of combustion energy and carbon dioxide emission from biobased and non-biobased materials.
Note I to entry: The biobased carbon dioxide emission is expressed in g/g, or emitted carbon dioxide amount (g) per sample mass (g).
gross calorific value absolute value of the specific energy of combustion, for unit mass of rubber or rubber-product sample burned in oxygen in a calorimetric bomb under specified conditions.
Note 1 to entry: The products of combustion are assumed to consist of gaseous oxygen, nitrogen, carbon dioxide and sulfur dioxide, of liquid water (in equilibrium with its vapour) saturated with carbon dioxide under the conditions of the bomb reaction, and of solid ash, all at the reference temperature.
Note 2 to entry: The gross caloriflc value is expressed in 11g.
net calorific value absolute value of the specific energy of combustion, for unit mass of rubber or rubber-product sample burned in oxygen in a calorimetric bomb under such conditions that all the water of the reaction products remains as water vapour, the other products being as for the gross calorific value (j), all at the reference temperature.
Note I to entry: The net calorific value is expressed in J/g.
A sample from rubber or a rubber product is completely combusted in a pressure-proot sealed vessel (bomb) with high pressure oxygen gas settled in an insulated area. The combustion energy of the sample is calculated from the increased heat in the insulated area. The carbon dioxide emission amount is determined by measuring both the combustion gas volume collected from the used bomb and its carbon dioxide concentration.
The biobased combustion energy and the biobased carbon dioxide emission can be calculated in proportion by multiplying the obtained values by the biobased carbon content.
NOTE There are two kinds of combustion energies, i.e. gross calorific value and net caloriflc value (see Annex A for information). This document specifies the determination of gross calorific value of rubber and rubber products.
For raw rubber, carry out sampling in accordance with ISO 1795. For vulcanized rubber, carry out sampling in accordance with ISO 4661-2.
Determination of the combustion energy of biobased and nonbiobased materials
This method specifies how to determine the combustion energy of rubber or a rubber product using a bomb calorimeter. A high-pressure proof sealed bomb is used as a measuring vessel. A test sample is placed in the bomb filled with high-pressure oxygen with an ignition wire contacting the sample. The bomb is then placed in a water vessel the temperature of which is accurately controlled and measured. The test sample is combusted by igniting the wire and the caloriuic value is determined by the temperature increase, the volume of water in the water vessel (or the heat capacity of calorimeter) and the heat capacity of the bomb.
The combustion system is calibrated by combusting the calorimetric standard, i.e. certified benzoic acid. lithe carbon dioxide emission amount is to be measured in the later process, the combustion gas in the bomb shall be collected and used for the determination.
Reagents and materials Oxygen, at a pressure high enough to fill the bomb to 3 MPa, pure, with an assay of at least 99,5% volume fraction, and free from combustible matter.
NOTE Oxygen made by the electrolytic process can contain up to 4% volume fraction of hydrogen.
Benzoic acid, of calorimetric-standard quality, certified by (or traceable to) a recognized standardizing authority.BS ISO 20463 pdf download.
Tags: Rubber and rubber products
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