Pyroflux 385
Sodium-Free Drossing Flux for Magnesium and All Other Aluminium Alloys
Pyroflux 385 a flux designed for those alloys where sodium may be detrimental to either the physical characteristics or the chemistry of the alloy and its primary use as a drossing flux. Some operators have been successful using Pyroflux 385 as a cleaning flux. However, working the flux through the bath and allowing it to resurface, adding an additional amount before drossing off is recommended. Sufficient time must be given for all flux to surface when using as a cleaning flux to avoid possible inclusions in the castings.
Temperature Range
Flux Application Notes
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A general guideline for quantity is to broadcast ¼ inch (6 mm) over the entire surface of the particular furnace.
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To avoid excessive smoking caused by separation of ingredient "fines" attaching to the roof and walls of the furnace, broadcast the flux by "laying" it out evenly over the surface of the dross.
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The most important thing about working dross is to not "rewet" the clean metal-free dross by splashing metal back into the dross through sloppy furnace tool handling. This causes freshly fluxed dross to become inundated with free metallics and will also cost the operator valuable time.
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In all instances, careful skimming is essential for efficient metal recovery.
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This flux is relatively "hot" and works well with colder heats where conventional sodium-free fluxes typically fail to give the operator the desired results.
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Pyroflux 385 is not designed for flux injection machines. It can be injected for cleaning, but it is not a suitable degassing flux. One may opt to use Pyroflux 340 for flux injection with degassing capabilities.
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When used in temperatures in excess of 1400ºF (760ºC), care should be taken that "thermiting" does not take place. Once dross reaches the point of "glowing" white hot, valuable metal is being consumed and the operator may opt for a colder reacting, sodium–free flux such as Pyroflux 305 or Pyroflux 355.
- Not designed for injection with a commercial injection system.
Physical Properties and Product Blend
- Pyroflux 385 is a cream-white flux containing potassium sulfate, potassium chloride and potassium silicofluoride.
- Pyroflux 385 has the addition of potassium sulfate to support higher temperature applications. It allows the flux to fire in alloys pouring at higher temperatures.
Quality castings begin with proper fluxing practices. Contact your Pyrotek Sales Engineer to determine the appropriate flux for your operation. 866-Pyrotek (866-797-6835)
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