Vika oxygen generator
Vika or TGK is a oxygen generating system for spaceflight.[1] It is a SFOG, or solid-fuel oxygen generator, a kind of chemical oxygen generator.[1] It is has been used on the retired Mir space station and the International Space Station.[1] It was originally developed by Roscosmos to supplement the Elektron oxygen system on Mir.[1] A Vika module, also known as a "candle", contains about one liter of lithium perchlorate and can provide oxygen for one person for 24 hours.[1]
The NASA name for the system is SFOG, but it also uses the Russian acronym TGK.[1]