Colorado Plastics Blog

Next Half-Price Plastic Remnant Sale 1/22/15

Posted by Drew Schwartz on Wed, Nov 04, 2015 @ 11:11 AM


Louisville Plastic Sale Delrin Acrylic

We sell remnants to the public by the pound every day, but one day a month they go on sale for half the every day price.

So, we've got the remnant bins ready again, because Friday, January 22, 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..
  • Note: Sheet and Plate Remnants are not usually more than 17" wide

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):

Colorado Tech Center 4th Friday Plastic Sale

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

Topics: Teflon, nylon, polycarbonate, acrylic, hdpe, Delrin, Monthly Half-Price Remnant Sale, Plastic Remnants, performance plastics

How Much Does That Piece of Plastic Weigh? (So I Can Calculate Its Remant Price)

Posted by Drew Schwartz on Fri, Jun 19, 2015 @ 10:06 AM

Plastic Weight Scale

In my last blog post, I published a list of our remnant prices for many of the different plastic materials that we sell.  The list shows $/lb.  But in order to know the remnant price for a particular size and thickness of a particular type of plastic you need to know the weight per square foot.

Here's a table of the different types of plastic sheet or plate that we most commonly sell:


Each column shows the weight, in pounds, for a square foot of the particular plastic listed in each row.

And even though we don't sell rod remnants by the pound, it is sometimes useful to know how much plastic rods weigh, by the running foot, for freight and shipping purposes.

So here's also a list of the different types of plastic rod that most commonly sell:


Each column on this table shows the weight, in pounds, for a running foot of the plastic listed in each row.

Topics: polypropylene, polystryrene, nylon, polycarbonate, acrylic, hdpe, Delrin, Plastic Remnants

We Sell Plastic Remnants Every Day (or Remnant Prices at Colorado Plastics)

Posted by Drew Schwartz on Thu, Jun 18, 2015 @ 13:06 PM

I Heart Scrap Recycle

We don't just sell plastic remnants on 4th Fridays here at Colorado Plastics.  

We are open to the public to sell remants (also called scrap by some of our customers) every day.

The price that we charge for remnants is based on weight in pounds (lbs).

To calculate the weight of a given size piece, of a particular type of plastic remnant, check out the table on this Colorado Plastics blog post, which shows weights per square foot by thickness.

Different types of plastics sell for diffent prices.  And sometimes the same plastic will sell for different prices, depending on color and thickness.  And of course, plastics with stiffening or lubricating additives, like glass-filled nylon or Teflon-filled Delrin, sell for different prices than their unfilled versions.

Here is a table of the everyday remnant price vs 4th Friday remnant prices (in dollars per pound):Remnant Price Sheet

Topics: polypropylene, polystryrene, Teflon, nylon, polycarbonate, acrylic, hdpe, Delrin, Monthly Half-Price Remnant Sale, Plastic Remnants

Adhesives for Mechanical Plastics.....Or What Kind of Glues Work on Delrin?

Posted by Drew Schwartz on Tue, Jun 09, 2015 @ 18:06 PM

Plastic Glue AdhesiveThe most commonly used, and the most commonly specified, machineable plastics are difficult or impossible to fasten to themselves with one-part adhesives.
Delrin in particular cannot be glued to itself with any sort of significant bond strength with a one-part.  By saying Delrin I am referring to both acetal homopolymer and acetal copolymer.
The reason for thisis that one-part solvent based adhesives do not dissolve the surface of Delrin plastic shapes properly. Solvent based adhesives work by making the two surfaces a material to be bonded "sticky". Once the two sticky pieces are clamped together and allowed to dry (i.e. the solvent evaporates) they become one bonded piece.
There are some uncommon pretreatment steps, like low-pressure plasma treatment that have been reported to improve the strength of Delrin to Delrin solvent bonds.
3M also sells several two-part adhesives like their formulas DP8010 and DP8010NS that can be used to bond polyolefins like polypropylene and polyethylene to themselves.
If you have any questions about bonding machineable plastics to themselves, please get in touch with us here at Colorado Plastics. 

Topics: polypropylene, Delrin, performance plastics

Acetal Copolymer vs Delrin......What's the Data Show?

Posted by Drew Schwartz on Wed, Mar 18, 2015 @ 16:03 PM

Mechanical Thermoplastic Acetal Delrin

Acetal copolymer is a mechanical thermoplastic. But what sets it aside from other closely related mechanical thermoplastics, such as acetal  homopolymer? In this post we will take a look at some of the technical data differences between these two industrial plastics.

While structurally different, copolymers and homopolymers both use formaldehyde as a major raw material in their production. To really explain how they are different, we must first break down their makeup. These synthetic high polymers have a chemical structure consisting of repeated monomer units connected to each other with chemical bonds. A mer is the term for one of these units needed to form a high polymer. If a polymer only consists of one type of mer, it is known as a homopolymer. A polymer consisting of more than one type of monomer is known as a copolymer. This difference is subtle, but important to the function of the resulting plastic. Both plastics will have varying properties as a result.



Here is a data table showing the small differences between acetal copolymer and Delrin mechanical, thermal, electrical and flammability properties.Properties of Acetal Copolymer vs Delrin

Material Stability Differences

Thanks to its lower levels of crystallinity, acetal copolymers have excellent dimensional stability. Additionally, they feature advanced resistance to wear, impact, and friction.

On the other hand, homopolymers have higher mechanical properties, at the cost of a lower density center. However, they boast higher impact strength, greater stiffness, and are slightly harder.

In actuality, the materials aren't greatly different.

If you would like to know more about these polymers, we welcome you to visit our website. Additionally, you may contact us with any questions or comments.

Topics: Delrin

Delrin Industrial Plastic

Posted by Drew Schwartz on Thu, Feb 26, 2015 @ 13:02 PM

Delrin (Industrial Mechanical Engineering) Plastic

Delrin plastic is the DuPont trade name of a form of acetal homopolymer thermoplastic (acetals are generally abbreviated as POM for polyoxmethylene). DuPont patented the first practical form of the resin in 1956, synthesizing a thermally unstable form that was invented by a German chemist in the 1920s. Delrin has been in production by DuPont since 1960.

POM has a number of special properties that make it very useful industrially.



Delrin can be purchased in granular form that can be melted and formed into desired shapes by applying heat and pressure. It is sold in a range of viscosities, which make it amenable to a wide range of fabrication processes. It can be heat molded and extruded with standard equipment into rods, slabs, sheeting, or small diameter tubing. It is an ideal candidate for injection molding, rotational molding, or blow molding.  It can be machined using traditional milling machines. It can be drilled or cut with infra-red laser cutters.

Although POM is difficult to bond, special processes of surface etching, flame treatments and mechanical abrasion are available to improve the effectiveness of epoxies and other adhesives. Once treated, POM will bond with metals, leather, rubber and other plastics. Thermal welding has been used successfully as well. POM has excellent solvent resistant properties which have the downside of making solvent welding largely unsuccessful.

It is a comparatively dense crystalline plastic (more dense than about 72% of similar plastic materials). The material is almost self-lubricating, with a low friction coefficient and high abrasion tolerance. Special grades of Delrin are classified as static dissipative. It does not hold static electric charges but conducts the electrical charges internally as well as on the surface. With volume resistivity close to the insulator range, it will not hold static charges and can be used in an insulation function.

Delrin has been used in mechanical gears, sliding and guiding elements, housings, springs, chains, screws, nuts, fan wheels, pump parts, and valve bodies. It has been used in electrical parts manufacturing including insulators, bobbins, connectors. Delrin has been widely used in vehicle manufacture because of its electrical and mechanical properties. The Food and Drug Administration has approved acetals for use in food packaging.

For more info about the differences between Delrin and acetal copolymer check out this previous Colorado Plastics blog post.

Colorado Plastics is a full service wholesale distributor of Delrin plate and rod. We also provide custom manufacturing and contract manufacturing services. Contact us to discuss your needs.


Topics: plastic distributor, Delrin, performance plastics

What is the Difference Between Delrin and Acetal?

Posted by Drew Schwartz on Mon, Jan 12, 2015 @ 15:01 PM



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:


Topics: Delrin, performance plastics

Delrin and Acetal in Instructables Materials Lists

Posted by Drew Schwartz on Sun, Jan 19, 2014 @ 12:01 PM

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.

Topics: polycarbonate, acrylic, plastic distributor, prototype, Maker Movement, Delrin, performance plastics

Colorado Plastics Intro Video

Posted by Drew Schwartz on Tue, Nov 05, 2013 @ 17:11 PM

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.

Topics: polycarbonate, acrylic, CNC Router, custom fabrication, plastic sheets, plastic welding, plastic distributor, Delrin, performance plastics