Prozinco performs periodic inspection, including refurbishment and requalification according to EN 1440 of LPG bottles, like G4, G6, G13, G26, I350, G84 e G110, among others, for all Companies present on the Portuguese market as well as for Spain (Galp and Repsol Butano I350's).

The requalification of these bottles according to EN 1440 allows them to remain in the market for another 10 or 15 years, and its enforced by Law.