Outgassing characteristics of ceramic, metallic, and polymeric filters for H2O, O2, CO2, and CH4 were explored using APIMS. The outgassing data have been normalized with respect to the parameters that varied from one filter to the other. Hydrocarbon outgassing is also explored both at room temperature from freshly installed filters and at elevated temperatures. Polymeric filters appeared to be more transparent but did show hydrocarbon outgassing when heated to 50°C.

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