This has the same dimensions (57 x 44 x 3 mm) as the paper F_23, but is better suited for newer equipment, less than ~five years old. The flange surface must be completely smooth, undamaged and warp free.
Attention CA Residents: Prop 65 Warning
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.