For decades, customers asked for “that brand-name acetal without the holes” or “imported acetal” since most international manufacturers processed POM-C shapes. Centerline porosity was a common issue that weakened parts, raised hygiene concerns, and caused costly scrap.

Mitsubishi Chemical Group (MCG) helped solve this challenge in 1993 with Acetron™ GP—an almost completely porosity-free copolymer that set a new industry standard.

Why Rely on Acetron™ GP?

Acetron™ GP keeps all the strengths of acetal while substantially eliminating its biggest flaw—centerline porosity.

Key advantages:

  • Essentially no centerline porosity—Any isolated pores are almost always under 25 microns for stronger, cleaner, more reliable parts.
  • High stability in hot water and steam—Resists hydrolysis and holds size well over time.
  • Reliable in sanitizing chemistries—Handles bleach and strong alkalis better than POM-H.
  • Easy to machine—Clean chips, tight tolerances, and a smooth finish.

The MCG Difference

MCG doesn’t just supply resin. We deliver confidence.

  • Every lot is tested for residual stress and centerline micro-porosity.
  • Proprietary in-process testing developed and refined over decades for Acetron™ GP.
  • Trusted for decades in food, pharma, fluid handling, and precision parts.

What Machinists Get:

  • Fully dense parts with a smooth, consistent finish.
  • Less scrap from warping or out-of-tolerance features.
  • Batch-to-batch consistency they can trust

What End Users Get:

  • Predictable performance in real-world conditions.
  • Longer part life through hot-water and steam cycles.
  • Cleaner parts for better hygiene and compliance.

Specialty Grades for Every Need

Acetron™ GP is just the start. MCG offers a wide range of specialty machinable plastics, each meeting specific application needs.

Grade

POM-H

POM-C

Key Characteristics
Acetron™ GP ● Essentially porosity-free, low-stress POM-C shapes made by MCG
Acetron™ POM-H ● High-viscosity, extrusion grade POM-H
Acetron™ VMX ● Metal and X-ray detectable blue color for visual detection

Ongoing Innovation

MCG continues to innovate with specialty acetals like Acetron™ VMX. It’s a metal and X-ray detectable, blue-colored grade, often selected by customers for food environments where safety and compliance can’t be compromised.

 

Let’s spec it together.

Have a problem part? We’ll help you choose stock, geometry, and grade.
Start a conversation with MCG—we’re here to support your success.   
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