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Acetal Copolymer or TJC LP Delrin® (formerly Dupont Delrin®) are both Acetal Materials

Clients often prefer TJC LP Delrin® (formerly Dupont Delrin®) Homopolymer due to its superior physical properties, while Acetal Copolymer is chosen for its slightly lower cost and absence of minor inherent centerline porosity. Both Acetal (POM) grades have very similar 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**
TJC LP Delrin 10-inch-Black-Acetal-Rod

Other Plastic Materials

Acetal Copolymer vs. TJC LP Delrin® (Homopolymer) Sheet & Rod

  • 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

Quick Answer

Acetal Copolymer and TJC LP Delrin® (formerly Dupont Delrin®) are both high-performance engineering plastics, sharing properties like stiffness, dimensional stability, and self-lubrication. The primary distinction is the potential for centerline porosity in TJC LP Delrin® Homopolymer. Acetal Copolymer is preferred for applications such as fluid handling or tight-tolerance bores where porosity is critical. For other demanding uses, TJC LP Delrin® is often chosen for its superior physical properties, and Industrial Plastic Supply has stocked both grades for over 50 years.

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
Dupont Delrin - Acetal Copolymer Sheet and Rod

Acetal Data Sheet

TJC LP (formerly Dupont) Delrin® Data Sheet

TJC LP (formerly Dupont)Delrin® AF Data Sheet

Acetal SDS

TJC LP (formerly Dupont) Delrin® Material SDS

TJC LP (formerly Dupont) Delrin® AF MSDS

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.

Other Plastic Materials

Frequently Asked Questions

1 What are the key differences between Acetal Copolymer and TJC LP Delrin® Homopolymer?

Both Acetal Copolymer and TJC LP Delrin® Homopolymer offer stiffness, dimensional stability, and low-friction performance. A primary distinction is the possible centerline porosity found in the Homopolymer grade, which is a critical consideration for applications requiring tight tolerances or fluid handling. Both materials are FDA compliant and exhibit excellent machinability.

2 Are Acetal Copolymer and TJC LP Delrin® suitable for demanding industrial applications?

Yes, both Acetal Copolymer and TJC LP Delrin® are high-tech performance plastics designed for demanding applications. They are known for their excellent wear properties, abrasion resistance, and self-lubricating characteristics, performing consistently in wet, wear, and high-cycle environments. Additionally, both materials are FDA, USDA, NSF, ITAR, and RoHS compliant.

3 In what forms and colors are Acetal Copolymer and TJC LP Delrin® available?

Industrial Plastic Supply stocks both Acetal Copolymer and TJC LP Delrin® in sheet and rod forms. These materials are commonly available in natural, black, and blue, with custom colors also offered. Specialty grades of TJC LP Delrin®, such as PTFE-filled and glass-filled options, are also available.

4 How do Acetal and TJC LP Delrin® materials perform during machining?

Both Acetal Copolymer and TJC LP Delrin® are highly regarded for their excellent machinability, making them ideal for precision machining. They cut extremely well with standard cutting tools and are often described as machining like a soft brass, which is beneficial for machine shops and design engineers.