Volatile condensate material

Vacuum Outgassing and Permeability. Under vacuum, modified ethylene—tetrafluoroethylene copolymers give off Htde gas at elevated temperatures. The loss rate is about one-tenth of the acceptable maximum rates for spacecraft uses. Exposing 750-pm specimens for 24 h at 149°C to a high vacuum results ia a maximum weight loss of 0.12% volatile condensible material is less than 0.02%. 

ASTM E 595-90 Standard Test Method for Total Mass Loss and Collected Volatile Condensable Materials from Outgassing in a Vacuum Environment, 8 pp (DOD Adopted) (FSC 9330) (MR) (Comm E-21)... 

The apparatus shown in Fig. 1 is constructed from Pyrex glass and attached to a standard vacuum system equipped with a mechanical oil pump and mercury vapor diffusion pump. A detachable trap cooled in liquid nitrogen is inserted between the apparatus and the vacuum system so that any volatile condensible material escaping from the reactors during the experiment can be collected and weighed. 

Total mass loss, water vapor recovery, and volatile condensible materials (ASTM E595)... 

Light transmittance (ASTM D1003-00) Current carrying ability interconnect resistance (N/A) Hydrolytic stability (IPC-TM-650, TM 2.3.10) Voids, delamination (acoustic microscopy) (MIL-STD-883, Method 2030) Total mass loss, water vapor recovery, and volatile condensable materials (ASTM E595)... 

Another variation on outgassing is total-mass loss of cured-adhesive materials. Outgassing and subsequent condensation of volatiles is a concern, for example, in optical and space applications. A standard test method is ASTM E595, Total Mass Loss and Collected Volatile Condensible Materials from Outgassing in a Vacuum Environment Three measurements are made in this test total mass loss (TML), collected-volatile condensible materials (CVCM), and water-vapor regained (WVR). Historically, maxi-... 

Source Outgassing Data for Selecting Spacecraft Materials, NASA Publication 1124. CVCM collected volatile condensable materials TML total mass loss WVR weight volatile residue. 

Regarding the morphological stability along the time life of the space materials, NASA and ESA specified standardized degassing tests with the same acceptance limits (see ESA ECSS Q70 02A). The adhesive on space qualification does have an amount of a recovery mass loss (RML) and total mass loss (TML) less than 1% and of a collected volatile condensable material (GVGM) less than 0.1%. These acceptance limits are submitted for derogation depending on the absolute quantity of adhesive implemented. 

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