There are several Halon replacements currently in use in non aviation applications (Computer rooms ) etc
HFC 125 Pentafluoroethane
HFC-227 or
HFC-227ea The above two examples have a huge greenhouse gas penalty eg 3000 to 12000 more than CO2
Novec 1230, C6F12O, (3m Novec 1230) fluid is an environmentally friendly
Halon replacement for use as a gaseous fire suppression agent.
31 DECEMBER 2002 The last day that existing Halon systems may be recharged with recycled or reclaimed Halon. After this date, if a Halon suppression system discharges it is effectively useless.
31 DECEMBER 2003 By this date all existing Halon systems must have been decommissioned and the Halon itself must have been disposed of by an approved contractor. Halon portable extinguishers must also be taken out of service by this date. Halon therefore now has a negative value, requiring certified disposal.
The above two dates are for non aviation uses
IIRC In the EU the cut off date for any production is dec 31 2025 HTSH