Snap Lines, also called snap marks or deflection lines, are lines that appear on the surface of an aluminum extrusion during the extrusion process. These thin lines appear perpendicular to the extrusion direction around the entire extrusion. 

Snap Lines occur when the die makes sudden, small movements while under pressure. These movements are caused when the die deflects through the backer from pressure and friction in the extrusion process. The strength of the steel die is compromised by the profile opening; the larger the profile, the more the die can deflect. Eventually, the die moves in the stack to relieve the pressure and this creates a snap line.

325 LX EJECTEZE helps to eliminate snap lines. Apply a thin coating to the mating surfaces of the die stack with a brush prior to preheating. 325 LX EJECTEZE is a high-temperature, high-pressure lubricant that dries to a thin film in the die oven. 

When the tooling is assembled in the stack and put in the press, this thin lubricant film allows the pieces of the tooling to move against each other more freely… even under pressure. As the die deflects under pressure the die and backer plate move so that stress is not built and released under pressure.

325 LX EJECTEZE also acts as anti-solder to aid breakthrough.

The end results are mark-free extrusions and reduced defects.