Mold Polishing

Optimize your mold performance with precision polishing services backed by 40 years of experience.


Accurate mold polishing creates a uniform surface finish that will optimize part performance. Partner with Bales for polishing that matches your precise specifications. We’ll help you select the best finish for common and complex manufacturing issues:

  • PART STICKING - Create easier release from the mold.
  • PART RETENTION - Retain parts using blast finishes instead of undercuts and mechanical detents.
  • IMPERFECTIONS AND INCONSISTENCIES - Remove tool and machining marks and hide imperfections.

Available Finishing Solutions

Diamond Finishes - Hard

Diamond polishing creates the finest finish for highly visible or lens-quality parts. The SPI* A-2 is the most widely used diamond finish, with excellent release and appearance. The SPI A-3 is ideal for release where a high-gloss appearance isn't required. All diamond finishes work well with chrome and nickel coatings.

*SPI® is a registered trademark of Plastics Industry Association (PLASTICS)

Paper Finishes - Semi

Paper finishes are the second most-refined option after diamond polishing. They produce a slightly reflective or glossy shine and a very good release. Choose paper finishes for products that don’t require a decorative or visual effect.

Stone Finishes - Low

Stone finishes are the most economical polishing option. They’re a good choice for strictly functional molded parts where aesthetics don’t matter. Stone finishes provide a good release and deliver very little gloss to the plastic part. They’re also the first step in the process of diamond and paper polishing.

Why Bales Is Your Go-To for Polishing

Looking to maintain the details and sharp edges of your parts? Partner with the precision polishing experts at Bales. Looking for a reliable finishing resource that you can use every day? Get our Mold Finishing Guide!


If It’s Metal, We Cover It

Achieve the best surface treatment, no matter your industrial application.
Our metal finishing capabilities are as diverse as the industries we serve: