Subscribe by Email

Your email:

Follow Me

Colorado Plastics Blog

Current Articles | RSS Feed RSS Feed

Next Half-Price Fourth-Friday per Month Plastic Remnant Sale 2/27/15


Lafayette Louisville 20120120 00240 resized 600

We've got the remnant bins ready again, because Friday, February 27, 2015, from 8am to 5pm, is our next one day a month,  Fourth-Friday, Half-Price Remnants Sale!  

Please Join us at our One and Only Louisville location as we Once Again offer you, our Customers, an Opportunity to Obtain Enormous Value on Engineering, Machinable and See-Through Plastic Remnants of sheet, rod and tube..


  • We will be open our normal hours of 8am to 5pm.
  • No Minimum Purchase Amount is Required for this Sale.
  • Fax and e-mail requests will not be accepted this month. 
Please join us at our one and only Louisville location as we Once Again offer You our Customers, an Opportunity to Obtain Enormous Value on Engineering, Machinable and See-Through Plastic Remnants of sheet, rod and tube..
  • Remnants are not usually more than 17" wide
  • We will be open our normal hours of 8am to 5pm.
  • No Minimum Purchase Amount is Required for this Sale.
  • Fax and e-mail requests accepted.  We can also ship your puchase.

Colorado Plastic Products is located at 500 S. Arthur Ave, Louisville, CO 80027 (see map below or click here to open it in a new window):

New Location resized 600

Our regular business hours are M-F, 8am -5pm.

What is the Difference Between Delrin and Acetal?




Acetal resized 600

People sometimes ask us, "What is the difference between Delrin and acetal"?

Both names refer to a class of polymers known as polyoxymethylene or (POM),  POM is also known as acetal, polyacetal and polyformaldehyde which are forms of an engineering thermoplastic used in precision parts that require high stiffness, low friction and excellent dimensional stability.  Examples of parts that are frequently machined from the acetal plastics, incuding Delrin, are  wear strips, rollers, and bushings and other applications requiring a combination of strength, low moisture absorbtion, dimensional stability and chemical resistance. 

Delrin is DuPont’s trade name for acetal homopolymer.  Acetal is the name generally used in the plastics industry to refer to acetal copolymer.

Homopolymers are polymers that contain only a single type of subunit in their chain and copolymers are polymers containing a mixture of more than one type of subunit in their chain.

They each have their advantages and disadvantages.

At Colorado Plastics we generally recommend acetal (acetal copolymer) for plate shape applications and Delrin (acetal homopolymer) for rod shape applications.


Advantages of Delrin:

  • Higher Crystallinity = somewhat better mechanical properties includind tensile strength, resistance to creep and impact strength




Advantages of Acetal:

  • No centerline porosity
  • Better property retention at elevated temperatures
  • Frequently has lower resin and stock shape price
  • Available as FDA compliant n both black and natural = white colors
  • Better chemical resistance to fuels and solvents


Disadvantages of Delrin:

  • Smaller number of resin producers can lead to higher prices, although at Colorado Plastics we can typically offer both Delrin and acetal at the same price
  • Centerline porosity = midline cavitation at centerline of plate depth or crystalline dot at center of rod diameter

Disadvantages of Acetal:

  • Lower crystallinity = somewhat lesser mechanical properties (although some data shows this difference goes away over 12 - 24 months of age of plastic parts)




For datasheets on Ensinger brand Delrin and acetal sheet, plate and solid round mechanical plastic rod:


Delrin and Acetal in Instructables Materials Lists


Instructables is a website that allows users to post, and comment on, Do-It-Yourself (DIY) projects.  It's been around since 2005 and has a number of projects that credit Colorado Plastics as a source for the materials, like this one for a mini-milling machine which uses some Delrin (acetal homopolymer) or acetal sheet

Instructables MiniMill resized 600

and this one for an Iron Man Arc Reactor:


Iron Man Arc Reactor  resized 600

which uses some Delrin (or acetal copolymer) and some acrylic sheet.


But in this age of additive manufacturing, including 3-D printers, one of the most interesting projects that I've seen on Instructables is a DIY 360 degree scanner.  

360 Degree DIY Scanner on Instructables resized 600

This scanner is composed of 40 Raspberry Pies and 40 PI cameras, 40 8Gb SD cards, 1 single 60A 5v power supply to power all the raspberry Pies and LED Strips and their 12v power supply.  The author says he came up with this device to scan his two-year old son (I'm guessing to 3-D print a miniature model of the kid). The designer/fabricator observes that it "would be easier for me to invent a spaceship that can fly to mars then inventing a solution for my 2-year old son to sit still", meaning that commercially available single-shot scanners weren't up to the job.

Colorado Plastics, as a wholesale plastic vendor, is happy to provide engineering plastics, or just acrylic or sheet polycarbonate, for any of your DIY, prototype, OEM, production, or machine shop jobs.  We salute the spirit of product innovation in all its many forms.

Colorado Plastics Intro Video


Hope you enjoy this video.  It introduces you to our capabilities and facilities.  It's narrated by Drew Schwartz and features shop scenes of our master fabricator John Butler. It also includes a cameo from Hunter the poodle.

The video talks about our Made in Colorado products, our custom plastic fabrication, and our stock of wholesale plastics, like acetal copolymer and  delrin sheet.  We are known as Colorado's independent plastic distributor, and a wholesale plastic vendor.

All Posts