Acetal Copolymer or TJC LP Delrin® (formerly Dupont Delrin®) are both Acetal Materials
Acetal Copolymer and TJC LP Delrin® (formerly Dupont Delrin®)
Which Acetal material should you use?
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Both Acetal Copolymer and TJC LP Delrin® (formerly Dupont Delrin®) 150SA Homopolymer are FDA Compliant
- Both Acetal Copolymer and TJC LP Delrin® are very stiff and have excellent dimensional stability
- Both Acetal Copolymer and TJC LP Delrin® are Self Lubricating, Abrasion Resistance, and have Excellent Wear properties
- Available in Natural, Black and Blue. Custom colors also available.
- Both Acetal Copolymer and TJC LP Delrin® cut extremely well with standard cutting tools
- TJC LP Delrin® (formerly Dupont Delrin®) AF (PTFE Filled), Glass Filled, and Specialty Grades Available
- TJC LP Delrin® (formerly Dupont Delrin®) 150SA Homopolymer have similar properties and frequently replace: Noryl®, Nylon®, and PET or PBT materials
- Acetal and TJC LP Delrin® (formerly Dupont Delrin®) are High Tech Performance Plastics
Acetal (POM) is one of the most widely used engineering plastics in precision machining — and for good reason. Whether you need Acetal Copolymer or TJC LP Delrin® (formerly Dupont Delrin®) Homopolymer, both grades deliver the stiffness, dimensional stability, and low-friction performance that machinists and design engineers depend on across a wide range of demanding applications.
Industrial Plastic Supply has stocked both Acetal Copolymer sheet and rod and TJC LP Delrin® sheet and rod for over 50 years, giving customers the flexibility to specify exactly the grade they need — or get expert guidance on which is the right fit for their application. Both materials are FDA, USDA, NSF, ITAR, and RoHS compliant, machine like a soft brass, and perform consistently in wet, wear, and high-cycle environments.
The choice between the two often comes down to one key factor: the possible centerline porosity found in the Homopolymer grade. For parts where that matters — fluid handling, tight-tolerance bores, or thin cross-sections — Acetal Copolymer is typically the preferred option. For everything else, both grades are excellent performers.
Some reasons to choose Acetal Homopolymer vs. Acetal Copolymer
Both Acetal (POM) grades have very similar properties. Our clients seem to prefer the TJC LP Delrin® brand Homopolymer materials because of the superior physical properties. The issues that lead clients to the Acetal Copolymer is a slightly lower cost, and the minor inherent center-line porosity in the TJC LP Delrin® (formerly Dupont Delrin®) 150SA Homopolymer grade.
TJC LP Delrin® (formerly Dupont Delrin®) is the popular acetal homopolymer brand name and the most commonly used acetal homopolymer.
The TJC LP Delrin® (formerly Dupont Delrin®) 150SA is a brand name, and it is often referred to as POM-H or Acetal Homopolymer. Common brand or trade names for extruded Acetal Copolymer sheet and Acetal Copolymer rod materials include: Tecaform® AH, SUSTARIN® C, ZL® 900-C, Pomalux®, Unital®, Mechatec Acetal®, Acetron® and many more. This excellent mechanical plastic material is also referred to as: Acetal Copolymer rod, Acetal Copolymer rod, Acetal Copolymer Plastic Rod, Acetal Plastic, Polyacetal Delrin, Acetal Copolymer vs Acetal Homopolymer, Homopolymer Acetal rod, Acetal Homopolymer rod, and many others.
Industrial Plastic Supply, local plastic distributors have Specialized in Wholesale Acetal Copolymer and TJC LP Delrin® (formerly Dupont Delrin®) Engineering Plastics, Mechanical Plastics and High Performance Plastics for 50 years! We actively stock both Acetal Copolymer and the Delrin Homopolymer materials in both sheets and rods.
**Note: TJC LP Delrin® (formerly Dupont Delrin®) is a registered Trademark
(Occasionally referred to as: Delran, Delren, Delron, Delrun, Acetal Plastic, Polyacetal Delrin or many others)
If you want a deeper dive on the performance trade‑offs, see our detailed comparison of Acetal Copolymer vs TJC LP (formerly Dupont) Delrin® Homopolymer Acetal
**See also: Alignable Acetal – TJC LP (formerly Dupont) Delrin® Page
- Basics
- Acetal / TJC LP Delrin® (formerly Dupont Delrin®) Differences
- Applications
- Size and Tolerances
- Material Properties
Acetal Copolymer or TJC LP Delrin® (formerly Dupont Delrin®)
- Both the TJC LP Delrin® (formerly Dupont Delrin®) and Acetal Copolymer are FDA Compliant
- They are both very stiff and have excellent dimensional stability
- Are self-lubricating, abrasion-resistant, and have excellent wear properties
- Cuts extremely well with standard cutting tools
- TJC LP Delrin® (formerly Dupont) Delrin® AF (PTFE Filled), Glass Filled and Specialty Grades Available
- TJC LP Delrin® (formerly Dupont) Delrin® Rod and Plate have similar properties and frequently replace: Noryl®, Nylon and PET materials
Some reasons to choose Homopolymer vs. Copolymer
Both POM grades have very similar properties. Our clients seem to prefer the Acetal Copolymer over the Homopolymer materials due to the inherent center-line porosity in the TJC LP Delrin® (formerly Dupont Delrin®) Homo-polymer version. This means, that along the center of a rod, or the middle of a sheet, there is a band of area with tiny porous holes. This can weaken or cause problems with a finished part, and in extreme cases, you may see blow by or leakage at this center line. While TJC LP Delrin® (formerly Dupont Delrin®) is a brand name, it is a POM Homo-polymer.
The most requested and popular item we supply is the Acetal; the POM Copolymer resin made by one of the other big resin manufacturers – like BASF or Celanese/Tacona.
Both TJC LP Delrin® (formerly Dupont Delrin®) and Acetal are ITAR compliant, and TJC LP Delrin® (formerly Dupont Delrin®) and Acetal are RoHS compliant.
The most requested and popular item we supply is the Acetal; the POM Co-polymer resin made by one of the other big resin manufacturers – like BASF or Celanese/Tacona.
Both of these premium performance plastic resins are readily available. If you would prefer the TJC LP Delrin® (formerly Dupont Delrin®) brand Sheet or Rod, drop us a line, send us an email – we will be happy to ship the requested material for you. We don’t make judgments on the suitability of material for your application, we just supply what you, our clients ask for. Please, just let us know ahead of time if you have a preference. There are a few other names we hear when people are looking for TJC LP (formerly Dupont) Delrin®, like Delron, Delran, Delrun, Delren, and many more. Just let us know, and we will be happy to supply a high quality TJC LP (formerly Dupont) Delrin® brand or Copolymer Acetal product.
Want more information on the differences? Acetal Compared With TJC LP (formerly Dupont) Delrin® and Use The Best Wholesale Acetal Rod and Delrin® Rod Supplier. Natural Acetal Copolymer Rod Now Available up to 24″ in Diameter
Still not sure Delrin® or Acetal is the proper material for your application, consult our free Plastic Materials Selection Guide.
Industrial Plastic Supply proudly stocks both Acetal and TJC LP (formerly Dupont) Dupont Delrin 150SA from these premium manufacturers:
Ensinger® Plastics for TJC LP (formerly Dupont) Dupont Delrin 150SA and Tecaform AH Copolymer Acetal
Rochling® Plastics for TJC LP (formerly Dupont) Dupont Delrin 150SA and Sustarin C Copolymer Acetal
Z/L Plastics® for TJC LP (formerly Dupont) Dupont Delrin 150SA and ZL® 900 series Copolymer Acetal
And many more ‘American Made’ quality plastic manufacturers.
Both TJC LP (formerly Dupont) Delrin and Acetal are ITAR compliant, and Delrin and Acetal are RoHS compliant.
Acetal materials are excellent machining materials – a favorite of machinists. Works like a soft brass, and has exceptional dimensional stability. It comes as a stress relieved material, however if you plan to do extensive machining, you may need to stress relieve the parts prior to final pass. Rods are machined well in lathe and mill, sheets are machined or cut in most common machine tools.
- Excellent Machining
- Low co-efficient of Friction
- Very low moisture resistance
The work horse of the mechanical plastics family, it is one of the most popular grades of material we supply. Other brand or trade names: Pomalux®, Acetron®, Ensital®, Unital®, Tecaform®, Ultraform®, Celcon®, BASF®, Hostaform®, Ticona®, and TJC LP Delrin® (formerly Dupont Delrin®). Occasionally we are asked for the difference between Acetal and HDPE – here is an explanation.
Applications – Frequently used in:
- Wear and Slide machined parts from Rod and Plate
- FDA, NSF, 3-A, and USDA Compliant Machined Parts
- Easily machined parts for water / moisture environments
- Critical tolerance and dimensionally stable parts
- 185 degrees F Continuous Temperature Environments
- Rod and Rods, Sheet and Sheets for numerous applications
Acetal Sheet and Rod Specifications:
In stock we normally carry one of these resins: BASF Ultraform® H4320, Kepital® F10-02, or Hostaform® M25. Current Certifications and Specifications used for Acetal – TJC LP Delrin® (formerly Dupont Delrin®): FDA, USDA, NSF, ASTM D6778 Superseded or out dated Specifications for Acetal – TJC LP Delrin® (formerly Dupont Delrin®): L-P-392, ASTM D4181
Materials Available As
TJC LP Delrin® (formerly Dupont Delrin®) Sheet or Acetal Sheet – Acetal Plate: .062″ – 6.0″ up to 48″ X 120″ in Natural (White) and Black.
Acetal sheet and Acetal Plate thickness normally in stock: .125″, .187″, .250″, .312″, .375″, .500″, .625″, .750″, .875″, 1.0″, 1.250″, 1.500″, 1.750″, 2.0″, 2.250″, 2.500″, 2.750″, 3.0″, 3.250″, 3.50″, 3.750″, 4.0″, 4.50″, 5.0″ and larger
TJC LP Delrin® (formerly Dupont Delrin®) AF Sheet and Plate: .062″ – 3.0″ thick in 24″ X 48″, brown in color
TJC LP Delrin® (formerly Dupont Delrin®) AF Rod: .250″ – 10″ diameter rod in up to 120″ lengths, brown in color
Film: .005″ – .062″ up to 24″ wide in Natural (White) and Black (minimums may apply)
Acetal Rod and Rods: .125″ – 10″ diameter in Natural (White) and Black up to 120″ lengths For Colored Acetal – TJC LP Delrin® (formerly Dupont Delrin®) Rod Read Here.
Acetal Rod diameters normally in stock: .125″, .187″, .250″, .312″, .375″, .437″, .500″, .562″, .625″, .750″, .875″, 1.0″, 1.125″, 1.250″, 1.375″, 1.500″, 1.625″, 1.750″, 2.0″, 2.250″, 2.500″, 2.750″, 3.0″, 3.250″, 3.50″, 3.750″, 4.0″, 4.50″, 5.0″ and many more – up to 20.0″ diameter rod is available!
Special Formulations: Conductive, Static Dissipative, PTFE-TFE Filled, Glass Reinforced, Custom Sizes, Formulations, or Colors Occasionally we are asked for the difference between Acetal and HDPE – here is an explanation.
Typical Resin Properties:
| General Property | ASTM Test |
Typical Value Unfilled TJC LP Delrin® (formerly Dupont Delrin®) Homo-Polymer |
Typical Value Unfilled Co-Polymer | Typical Value Delrin® AF |
| Specific Gravity | D792 | 1.42 | 1.40 | 1.50 |
| Tensile Strength Yield | D638 | 9,600 – 11,000 | 9,000 – 10,200 | 7,600 |
| Tensile Modulus | D638 | 450,000 | 400,000 | 400,000 |
| Izod Impact – Notched | D256 | 1.2 | 1.0 | 0.9 |
| Hardness – Rockwell | D785 | M94 | M90 | M89 |
| Deflection Temp @ 264psi | D648 | 257 | 220 | 260 |
| Deflection Temp @ 66 psi | D648 | 347 | 335 | 347 |
| Water Absorption @ 24 hrs | % | 0.24 | 0.25 | 0.20 |
| Co. Thermal Expansion | D696 | 6.83X10-5 | 5.4X10-5 | 5.0X10-5 |
Properties are for evaluation purposes only. This information is not to be construed as a warranty, guarantee or assurance that you may achieve the same results. Materials made from different resin types, manufacturing techniques and manufacturers will react differently. The information should be used to compare against other materials only, and each user should make his own tests to determine suitability. No warranty as to this materials suitability are either expressed nor implied.