Lincoln 3350 PAPR APF 25 Short Headcovering KP3940 1 stainless rod pulsed spray Welding Positions All 702050296C pulsed spray Welding Positions All positions Tensile Strength (typical) 530–600 MPa (77–87 ksi) as welded with C25 Yield Strength (typical) 430–490 MPa (62–71 ksi) Elongation 23–25% Charpy V Notch ≥27 J (20 ft·lbf) at −29°C (−20°F) Conformances AWS A5 Low sensitivity to weld cracking with the 6XXX series base alloys APF 25 Short Headcovering for VIKING™ 3350 PAPR welding helmets Assigned Protection Factor 25 The short head covering delivers APF=25 protection on the VIKING™ 3350 PAPR system when the employer implements a continuing respirator program in compliance with the Respiratory Protection Standard (29 CFR 1910