Vacuum Exposed Materials List - spacecraft-design-lab-2019/documentation GitHub Wiki
See the NASA GSFC materials database for outgassing data. Source Document for Offgassing Database
NASA Parts Selection List: Wire and Cable
- NASA recommends FEP, PTFE, or ETFE insulation with copper wire
Standard: "PQ-Gen-04: The PocketQube shall meet the out-gassing requirement in order to prevent contamination of any other spacecraft during integration, testing and launch:
- TML ≤1.0%
- CVCM ≤0.1% Rationale: This is a general requirement for space systems outgassing criteria as per ECSS-Q-70-02C [4]. " From PocketQube standard.
Material | Component/Location Description | Outgassing Data |
---|---|---|
Loctite 222 | Threadlocker for all screws | GSFC7742 |
Windform XT 2.0 | Chassis Material | Windform Additional Test Results |
Brass | Heat-set Inserts for screws | - (zinc-alloy brass can be dangerous) |
Material | Description | %TML | %CVCM | Cure time | Cure at Temp | AT-MOS | % WVR | DATA REF | APPLICATION | MFR Code |
---|---|---|---|---|---|---|---|---|---|---|
LOCTITE 222 | MILD STRENGTH ADH PURPLE | 17.71 | 7.65 | 24H | 25 PSI | 0.43 | GSFC7742 | THREAD SEAL | LTC | |
LOCTITE 222 | MILD STRENGTH ADH PURPLE FROM BOLTS | 26.84 | 13.78 | 48H | 25 PSI | 0.00 | GSFC9668 | ADHESIVE | LTC | |
WINDFORM SP | 0.50 | 0.06 | 0.15 | GSC33736 | STRUCTURAL PLASTIC | CRP | ||||
WINDFORM XT 2.0 | 0.53 | 0.00 | 0.22 | GSC33739 | STRUCTURAL PLASTIC | CRP |
Note: Loctite is far in excess of the general standard, but it should be fine on the basis of small amounts not being exposed, as per ECSS-Q-ST-70-02C http://esmat.esa.int/ecss-q-st-70-02c.pdf
"5.5.3.2 Corrective actions for high outgassing materials a. In case the material outgassing is higher than the general requirements in 5.5.3.1, corrective actions shall be taken. NOTE Corrective actions can be relaxed for the following conditions: • if very small mass is used; • if the location of the material is far away from the sensitive items; • if the high outgassing material is shielded; • if the outgassing species (e.g. water) are not seen as a critical containment."
TODO: figure out who needs to sign off on this corrective action. Consider other exposed materials.