Super Chill Vaccum Blocks


Super Chill Vacuum Blocks are highly durable inserts designed to connect a vacuum system to a die for active vacuum evacuation of air and gas from the cavity.

  • Replaceable inserts available in Copper or H-13
  • Use when greater thermal conductivity may be required
  • Technical assistance to evaluate parts for applicability of vacuum-assist
  • Technical assistance to design exit runners for optimal evacuation

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Stationary Side


Ejector Side


H-13 for durability

Super Chill Vacuum Block holders are manufactured from premium H-13 and heat treated to 44-46 HRC for long life.

Copper for greater thermal conductivity

Replaceable flow pattern inserts are available in berylliium-free copper for situations requiring greater thermal conductivity. Using a replaceable insert allows the end user to simply replace worn out inserts instead of complete copper blocks reducing use-life costs. Inserts are also available in H-13.

Let the experts build your custom vacuum blocks!

Let the Valve-Less Vacuum and Vent Block experts design and manufacture your custom chill vents. Our machinery and manufacturing is specifically set up to for efficient manufacturing of chill vents. Every tooth is inspected on our CMM to ensure that your die has the evacuation areas that you have planned for. Email your print or CAD model to or, if you require design assistance, please callus at (763) 428-4229.


  • Reduce porosity related scrap
  • Improve part cosmetics
  • Reduce press time to fill quotas
  • Improve part fill


Incorporating vacuum-assist when first quoting a part can help to maximize job profitability and minimize potential loss by ensuring proper air and gas evacuation from the start.


  • Higher casting yields
  • Faster job completion with less press time
  • More efficiency in casting process


  • High fallout rates due to porosity or poor fill
  • Downtime while troubleshooting
  • Resources spent troubleshooting


Vacuum-assist can be a highly effective remediation tool when a casting presents unacceptable or undesirable fallout rates due to poor fill or excessive air and gas porosity. Midland Technologies provides the service of reviewing specific casting porosity and fill issues to evaluate applicability of vacuum-assist.

  • Valve-Less Vacuum Blocks are installed into a pocket cut directly into the die set or mounted to the outside of the die using support blocks.
  • Locating pucks are utilized to ensure critical alignment between the stationary and moveable sides of the Valve-Less Vacuum Block.
  • Vacuum hose is connected to the Valve-Less Block nipple via a clamp or threaded barb. Please note that threaded barbs must be requested at time of block purchase or can be purchased separately at a later time.


  • A runner system is cut from the cavity insert to the Valve-Less Vacuum Block providing a highly efficient means for evacuation of air and gas from the cavity. Midland can design your exit runner scheme when you purchase purchase Midland Valve-Less Vacuum Blocks and provide a 2D layout of your die.


When utilizing Valve-Less Vacuum Blocks the vacuum system may be kept in the “on” or “open” condition throughout solidification. Note that Valve-Less Vacuum Blocks can also be utilized for passive venting by simply disconnecting them from the vacuum system.

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Correct installation is critical to proper function

Ensure parting line of blocks is flush with, or .001 – .002 proud to cavity inserts

Blocks inserted at least 4.50″ from the edge of the mold base

Inlet of blocks should be flush to the die cavity insert and mate evenly in closed condition

Correctly machine pockets to ensure no shift in locating key

Use vertical mounting holes when running with water

Manage velocity with properly designed exit runners

Excessive velocity in metal exiting the cavity can lead to several failure points when using vacuum-assist. To achieve the best possible results with Valve-Less Vacuum Blocks we recommend managing velocity of metal as it exits the cavity to help prevent solder, flash, spitting or runner washout.


Midland Technologies can supply you with a recommended exit runner design when Midland Valve-Less Blocks are purchased!