(1) acidic flux: AF-330,
(2) neutral flux: AF-550
(3) basic flux:AF-990.
AF-330: Its excellent slag removal making it the most common choice for a variety of applications. Designed for welding on rusty or scaly sheet steel and single arc high speed welding.
AF-550: General purpose flux designed to weld butt joints and both single and multiple pass fillets.
AF-990: It has good operating characteristics and produces excellent impact properties when using ASA series wires and is the ideal flux for most double ending applications.