Thank you for visiting our booth at PTXPO!

We enjoyed meeting with you at the booth and presenting our approach to venting molds.  This was a busy show!  If we missed connecting with you, please contact us to learn more about preventing defects.


At Molder’s World, our goal is to provide the technical expertise and materials to help p you produce better plastic products at less cost.

Vortex® self-venting mold steel and inserts eliminate trapped gas which results in the production of higher quality parts.

Let us know how we can assist you with reducing defects that come from trapped gas, short shots, and flashing while lowering gloss levels.

Visit Molder’s World at PTXPO March 28-30, 2023
Booth #1534

Introducing Larger Pore Sized Vortex – for Vacuum/Thermoforming!

Vortex® Self-Venting Mold Steel — eliminates gas buildup, lowers cycle time, and reduces scrap & reject rates

Vortex is now available in large and small pore sizes!

• Vortex for Vacuum/Thermoforming – sintered, porous metal with porosity of 25% air by volume and comes in 30, 60 and 80 microns.
• Vortex for Injection Molding – sintered, porous metal that is heat treated to 43 HRc with porosity of 25% air by volume with an average diameter of 7 (.0003″) microns.

Vortex is available:
• Mold Steel
• Pins & Core Pins
• Custom Inserts & Core and Press In Pins


Venting Tip #1: ‘One Piece Flow’

“With deep ribs, or small details, it is imperative that the gases produced during processing have somewhere to go, in order to allow the molten plastic to completely fill out the cavity. If there is not a parting line or ejector pin at a location that requires venting, sometimes it is necessary to use porous vent stock in the mold. Proper venting is the only way to assure that good parts can be produced, and processing can be optimized. For venting, we only use Vortex.”
Valent Meluch
Colonial Patterns Inc.

It’s more than just a key Lean manufacturing concept.
Molds that are designed to fill completely make the highest quality parts. Identifying ‘difficult to fill’ areas during the design is critical as molds that don’t completely fill, make defective parts and have to be sent back for more machining—creating waste. Think ‘One Piece Flow’—and you will have designed a mold from the beginning, that will reduce scrap and downtime while increasing production time.

Learn More:

Vortex® self-venting steel eliminates gas in your mold—resulting in higher quality
plastic parts—at less cost

Vortex® is a sintered, porous metal that is heat treated to 43 HRc with
porosity of 25% air by volume. It is typical of 400 series stainless steel in its
machinability and thermal connectivity. See how Vortex eliminates gas in
this VIDEO.


  • Eliminates gas buildup, short shots,
    and flashing
  • Reduces injection pressure
  • Lowers cycle times and gloss levels
  • Substantially reduces scrap and
    reject rates
  • Saves molders time and money

Vortex Steel Demo Video (11 sec.)