Good and bad materials
| Goodmaterials
|
Stainless steel 1.4021, Aluminum AlMg4.5Mn (electro polished), 6061 Al ( essentially pure aluminium ) / 2024 Al ( harder alloy ), Alumina ( careful with glazed ceramics ), Molybdenum, Tungsten, "Mu-metal" magnetic shielding ( Co, Ni, Fe ), Copper CuB gold plated (oxygen free), OFHC copper / pure copper, Be-Cu alloy / phosphor bronze, Sn-Ag solder, Master Bond glues, Heating resistors, Fiberglass, MACOR ( machinable glass composite ), 304 SS ( non magnetic ) / 310 series SS / 340 SS ( magnetic ), Kapton, Torlon, Teflon ( gassy, compressible ), VITON(R), Polyimide ( Vespel ), Quartz / pyrex ( gassy ), Zeolite ( regenerated higher than 200 °C ), Charcoal, Military grade hermetic connectors, Glass-platinium temperature sensor, Ultra high vacuum grease (10-12 mBar) |
| Badmaterials
|
Heat shrinks, Plastic clamps, Plasticizer : Dioctylphthalate ( C24 H38 O4), Silicon vacuum grease, Anodized aluminium, Zn / Cd ( especially be careful with fasteners, bolts ), Brass, Some solders ( eutectics have high vapor pressures ), Adhaesive foils (all kinds), Unknown black paint, Unknown copper alloys with oxygen, Unknown plastic materials, Super glue and uncertified glues, "Honey Glue" GE 7031 - insulating varnish and adhaesive, Coax video cables, Fuses |
Outgassing rates for common materials
| Fresh aluminium | 9 x 10-9( millibar-liter / sec-cm2 ) | |
| Aluminium baked for 20 h at 100 °C | 5 x 10-14 ( millibar-liter / sec-cm2 ) | |
| 304 SS | 2 x 10-8 ( millibar-liter / sec-cm2 ) | |
| 304 SS ( electropolished ) | 6 x 10-9 ( millibar-liter / sec-cm2 ) | |
| Teflon | 8 x 10-8 ( millibar-liter / sec-cm2 ) | |
| VITON(R) ( fresh ) | 2 x 10-6 ( millibar-liter / sec-cm2 ) |
List of used materials
| Curing in vacuum | Maximum service temperature | ||
| Alcohol | Ethanol | - | - |
| iso-Propanol | - | - | |
| Coax video cables | (Have to be replaced in future.) | - | - |
| Fiberglass | HGW 2372, Ferrozell | - | 130 oC |
| Glue | Master Bond EP21TCHT-1 |
1-2 h / 93 oC | -269 oC to + 204 oC |
| Supreme 10 HT (not yet used) | 1 h / 121 oC | -269 oC to + 204 oC | |
| Heating resistors | Caddock, MP821, TO-220 Power Package, 20 W | - | 175 oC |
| Internal connectors | Harwin connectors, glass-filled polyester UL94V-0 |
- | 85 oC |
| O-Ring | Busak Shamban material: VITON(R) 70A / 80A ("Flow Kautschuk") |
- | 200 oC |
| PCBs | Printed Circuit Boards material: Polyimide resin with copper |
4 h / 120 oC | 130 oC (250 oC) |
| Ultra high vacuum grease | Fluorinated Fomblin grease, FM 090, Balzers |
- | 100 oC |
| Vacuum connectors | High-density hermetic connectors, Filcon | - | 95 oC |
| Sorption pumps | Zeolite | 18 h / 200 oC | 350 oC |
| Active charcoal | 18 h / 20 oC | 100 oC ( ? ) |