Plastic Materials Questions

I’m interested in your polishing capabilities for a project.  We are making domino tiles out of a hard phenolic thermoset that will require polishing.  Our previous supplier had a multi-step process that started with a vibrating tub and liquid slurry then moved to barrel tumbling.  We’re looking to make around 16k pieces which is more than our previous supplier can handle.  We’re open to other polishing methods that may achieve the same result.

Plastic polishing can be achieved in various methods. The methods we employ here at Connecticut Plastics are Mechanical polishing or buffing, vapor and flame polishing. We can help you choose the best method that will best suit your material of choice and your budget.


I have a question about your abilities to work with the material PEEK? I need a prototype of a part that is a 1/2 inch long cylinder terminated with a half-dome at each end. I need trenches to be milled into this part. The ideal trench size would be around 20-30 mils wide and 20-30 mils deep. Does this sound like something that you’d be able to machine? What is the smallest that you could reliably machine these trenches?

Our expertise lies in micro machining critical components. Many times these are very small and with very high tolerances. PEEK is a material well suited to these types of applications. We will be happy to provide you with a quote on this job.


Please quote the cost to fabricate 4″ diameter wheels with a 1″ U shaped groove around the entire perimeter. The width of each wheel should be 1 1/2″ and there should be a 3/4″ hole in the middle for an axle/bearing assembly. These are not load bearing, just guide wheels to roll along 1″ OD pipe. You can help with the choice of the best material for my application. I will need 8 of these wheels.

We can assist with material selection. Some of the factors we consider when selecting a material are: environmental conditions such as temperature and chemical contact, mechanical stress on the material and of course the cost of material.


I’m interested in a quote on 4 small mockup reactor vessels. I would appreciate your expertise on material selection. The reactor must have good optical clarity and be able to withstand temperature of 300 degrees Fahrenheit. Can your company help with this project?

Connecticut Plastics can help with your requirements. Based on your requirements of optical clarity and temperature we would recommend Ultem however we would further question what chemicals the component will be exposed to in your application.


Looking at protoyping this part in black polypropylene. Initial quantity in mind would be 3 and after that if prototyping goes well and all revisions are made, we’re thinking something along the line of 50 or 100.  Right now I’m shopping for a plastic fabricator to machine this part for us.

Precision finished polypropylene is a core competency of ours. We have some of the best finishes with no burrs and good dimensional stability. Please forward a drawing so we can provide you with a quote


We are looking to have this part made as a prototype.  We are looking for the parts to be weather resistant (sun and heat), black in color, with final finish quality close to ABS plastic.  We are looking for a working part, the strength should also be close to ABS plastic.

ABS plastic is available in black and sounds like a good choice for you application. We will be happy to quote this job for you.


I would like to get a quote for machining 2 pieces of polycarbonate tubes. Outer diameter = 1”, inner diameter=0.875” and the length=11″.  The tolerance for the inner diameter is +/- 0.001.  Is there any issue with moisture and liquid (water and glycerin) absorption causing deformation of the polycarbonate tubing?  Especially important to our project, is keeping the internal diameter of the machined component as permanent as possible, during exposure to water/glycerin, as well as keeping the smoothness of the internal surface. Any suggestions of suitable transparent, bio-compatible material are welcome.

ID tolerances of .001 over an 11” length is difficult. I am not concerned about the absorption but the clarity could be affected. Can you provide us with a CAD drawing?


I would like to obtain a quote on the attached part using PEEK or Nylon.  The part will eventually be over molded using Tecothane and we need to be sure the wall thickness will not result in the part being crushed.  Any suggestions that would result in ease of machine ability and therefore a reduction in part cost, would be appreciated. I am looking for a new supplier for the polishing of our optical enlightened acrylic.  I would like a quote from you but would also like to see a sample of your work.

Peek and Nylon and fairly different plastics. Peek is much more expensive but has a high ease of machining, excellent chemical resistance and good stability. Nylon is more difficult for burrs and absorbs a lot of moisture.


I am consulting on a PD project that requires the prototype part to have a chrome plated finish; material can be ABS or ABS/PC alloy. Do you have the capability to machine ABS where the finished surface will be acceptable for decorative plating process?

Yes we can, please specify your target finish.


When utilizing PMMA and Polycarbonate in an application, what is the minimum radius of an external corner after vapor polishing using the process for optical polishing?

Typically the vapor polish will leave the corner fairly sharp. I would expect a .0005 to .001” break.


I am looking for a plastics machining house to quote a part we need to have machined from black PEEK material.

Black Peek machining is a good choice in high performance applications, please submit a drawing and we will be happy to quote you on this project.


We are designing a test cell for soil testing instrument.  This cell will have a window in order to view what is going on inside, and it will be pressurized to up to 60 psi.  The soil testing in question is very sensitive to volume change, so we have designed a dual-paned window with the test cell and window void under the same pressure.  We are hoping you can give us some help on designing and making the window portion of the apparatus.  Please find a drawing attached with the major test cell parts.  We are civil engineers, and need your input on this design.

Consider acrylic as a material with good light transmittance.


We are working on a plastic part for a rotor blade.  We currently use extruded Ultem 2100 for these types of applications, but due to the complexity of this part it would need to be either injection-molded or machined.  Initially, this would be for a relatively low-volume order so I think that a machined piece of Ultem 2100 (or 2400 if possible) would be more cost-effective than a molding. Please see the attached step file to view the part.

Ultem 2400 is not available as an extrusion grade, try Ultem 2300.


I’m looking for only 1-2 pieces each of these two parts for prototype development. The material was originally envisioned to be “smoked plexiglass” but I’m told that machining acrylic may be too difficult. The fallback would be lexan, or perhaps another material that you suggest. I’m an electronics engineer – don’t know much about plastic machining.

Acrylic is very easy to machine and smoke color is readily available in a number of shades. Lexan is another good choice but more expensive and a less scratch resistant. Less availability of colors as well.


We are a marine ladder manufacturer and have developed a telescoping ladder for the Inflatable boat industry. I am looking for plastic flanged bushing to install in the lower ends of the stainless steel telescoping tubes. We will need three different sizes. We have not determined the best material but we are leaning towards black Delrin. Please recommend the best material and provide quote for precision machining.

Black Delrin is a good choice for marine applications. Please provide a print for plastic machining.


We are looking to have the ID/OD Threaded Plastic Nut quoted per the attached drawing.  It will serve as a drive nut in a telescoping actuation device, so although the engineer did not specify the material, we were hoping you could suggest one. We were thinking Delrin, Acetal or something similar.

Delrin is a good choice for plastic parts. It is low cost with reasonable performance and good chemical resistance. It is one of the most popular materials for plastic machining.


Please review the attached drawing. Although metal is specified, we were hoping to use a plastic polymer that could meet these specifications:

-Temperature range -18 deg C to 52 degrees C,

-Sunlight immunity 8.5kW-hrs/square meter/day

-Solar UV immunity 1000W/square meter/day

-Humidity 0% to 100%

We welcome your suggestions for the best possible material for our device.

Interesting plastic machining opportunity. Please call to discuss further.


I need a material recommendation for a piston we are using in a fuel pressure regulator. Then a price for plastic fabrication.

Please provide more information on the type of fuel that will be utilized, to help us in plastic material selection.


Please advise us, can the attached fluidic manifold be made out of nylatron?

Nylatron for a fluidic manifold is not very common. Please provide your operating characteristics and we can offer fluidic design assistance.


I am a junior mechanical engineering student looking to pursue a career in precision plastic manufacturing. I am currently in an internship and researching various materials to use in a fixturing project. I am looking for some samples of various plastic materials. Is there any way I could get a selection of materials offered?

We have lots of sample plastic parts. What type are you looking for specifically?


I am looking to find a plastic fabricator to source some pump parts for us that are clear, so people may see how our pumps work. I’ve attached a drawing of one part, the pump housing.  I am not particular about the material you recommend, so long as it does not change dimensions when compressed between the mating cap and stand, and can tolerate the potential for some interference with the pump gears.

Your best choice will be polycarbonate or acrylic, both vapor polish well for good transparency.