contaminant

This term is defined in ECSS-E-ST-10-04C as
molecular and particulate matter that can affect or degrade the performance of any component when being in line of sight with that component or when residing onto that component

This term is defined in ECSS-E-ST-35C Rev. 1 as
undesired material present in the propulsion system at any time of its life

This term is defined in ECSS-Q-ST-60-14C as
unwanted molecular or particulate matter (including microbiological matter) on the surface or in the environment of interest that can affect or degrade the relevant performance or life time

This term is defined in ECSS-Q-ST-70-01C as
any unwanted molecular or particulate matter (including microbiological matter) on the surface or in the environment of interest, that can affect or degrade the relevant performance or life time

This term is defined in ECSS-Q-ST-70-06C as
unwanted molecular or particulate matter (including microbiological matter) on the surface or in the environment of interest, that can affect or degrade the relevant performance or life time

This term is defined in ECSS-S-ST-00-01C as
undesirable molecular or particulate matter