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Reduce Die Casting Sinks by Proper Application of Lubricants

Posted by Hill and Griffith Company on Aug 8, 2017 4:56:06 PM

NADCA EC-515 Die Casting Defects Course Review, Basics for controlling die casting defects - By Dr. Steve Midson

  • Die Casting Sinks (surface depressions) are a form of shrink porosity
  • A sink forms when the shrink porosity is close to the surface, and as it cools it pulls the thin skin on the die surface in towards itself
  • The shrink porosity is close to the surface because the surface of the casting is the hottest point in that area of the casting

 Die Casting Sinks 1 copy.jpg

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  • Eventually, the casting solidifies with the sink in the surface
  • The clue that the spot is getting hot and that a sink might form is when the surface of the casting starts to get rough (or frosty in appearance)
  • The operator should notice this condition, and start to spray and/or adjust cooling line flow
  • What is needed is a change in temperature balance between the hot and cold areas

(Thanks to All About Metallurgy for posting this PDF. We'll cover other aspects of die casting defect control by the proper use of die casting lubricants from the course in upcoming blog posts)

(If you liked this article you might also like this post on, "Die Casting Defects")


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We are pleased to provide samples in quantities large enough to allow you to "try before you buy." Die Casting and Squeeze Lubricants- Diluco®, Permanent Mold Coatings- Concote™, Plunger Lube™- Graphite and non-graphite oils and pastes with excellent anti-wear properties, Casting Operations Products: Start-up lubes, Ladle coatings, Anti-soldering pastes, Water glycol, Trim press lubricants, Surface protection for casting storage, Corrosion protection for die storage, Cleaners for machines and dies, Corrosion protection for machines, Heat treatment quenchants, and Heat-transfer fluids. Also, Industrial Lubricants Griflube®, Hydraulic fluids with fire-resistant and anti-wear properties, Bio-Syn natural ester-based hydraulic fluid, Way oil knuckle lubes and Metalworking Fluids- Grifcut™

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Tags: Die Casting, Metal Casting, diecast, diecasting, Aluminum Die Casting Process, die casting release agent, die casting defects

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