sulametalli vakumeerimine annuste kaupa (umbes 10 kuni 15% metalli kogumahust) valukopast vaakumkambrisse imemise, seal hoidmise ja koppa tagasi laskmise teel (vt vaakumdegasatsioon), vacuum degassing while a small amount 10-15% of the total mass of metal is degassed at a time while the process is repeated until required level of degassing is achieved (see: vacuum degassing)