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Evolved Gas Analysis (EGA)

MANUFACTURER None
ACRONYM EGA
AVAILABILITY Official workshop hours are: 9:30 to 12.30 and 13.30 to 16:30 (in practice technicians are often available outside of these times)
RESTRICTIONS Use of this equipment requires evidence of advanced scientific standing & expertise, allied to proof of competency both in management of the health & safety environment & adherence to fundamental ethical principles relating to research & consultancy.
CONTACT 1 External enquiries: Martine Townsend - Grants & Funding Unit
CONTACT 2 Internal enquiries: Dr. Anna A. Stec
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SITE Harris Site

Description

Evolved Gas Analysis (EGA)

Thermogravimetric Analysis (TGA) provides the crucial material property data with which to interpret the complexities of burning behaviour. For example, ignition can only occur when there is sufficient fuel present in the gas phase. The temperature at which the first sharp mass loss occurs normally corresponds to the critical surface temperature for ignition, and if the addition of fire retardants delays this onset, they may also delay ignition.

TGA can be refined through knowledge of the gases evolved. Hydrated fillers release water vapour as they decompose; surface oxidation can result in carbon dioxide (CO2) formation, which tends to delay ignition; evolution of hydrocarbons is indicative of the fuel release step leading to ignition.

Attachment of a non-dispersive infrared analyser (NDIR) on the TGA exhaust provides a time resolved profile of CO2, CO, hydrocarbons and oxygen concentrations as a function of time, during the TGA run.

This technique allows the major decomposition products to be distinguished during thermal decomposition, particularly in relation to fuel gases and inert gases. The evolution of CO2 formed on the surface of the decomposing polymer is indicative of the consumption of oxygen and fuel, but accompanied by self-heating. CO2 is not formed in the gas phase below 500°C.

Item ID #776.

Last Updated: 9th August, 2017