Acetal Plastic Machining

Exhibiting high strength, low friction, and good wear properties in wet and dry environments, acetal one of the most versatile engineering plastics available. Acetal plastic is relatively easy to machine, making it ideal for applications that require complex and/or tight tolerance parts. Upland Fab’s extensive experience in working with acetal and diverse CNC machining capabilities enable us to produce high precision parts from acetal plastics in various grades.


Acetal Homopolymer vs. Acetal Copolymer


Acetal plastic is available as a homopolymer and as a copolymer, both of which provide specific characteristics that may make them better suited to your application. Acetal homopolymer and acetal copolymer are available in a variety of grades, including FDA compliant grades for food-contact applications. Contact us to discuss the material requirements of your project.


  • Acetal homopolymer is better known as Delrin. Delrin provides greater strength at room temperature than acetal copolymer, as well as greater stiffness and toughness.


  • Acetal copolymer provides superior performance in continuous high heat or hot water conditions; it also exhibits lower porosity than acetal homopolymer.


The Experts in Acetal Machining


Upland Fab utilizes multi-axis CNC machining when working with acetal plastics. Our state-of-the-art fabrication technology ensures that your parts are machined correctly the first time, with minimal handling, fixturing, and material waste. Thanks to our advanced CNC capabilities, even the most complex parts can often be completed in a single operation, leading to faster turnaround times.


Using DPD/MBD processes (Digital Product Definition/Model-Based Definition), we are able to machine parts directly from your CAD models. This significantly reduces the possibility of error, improves accuracy, and lowers costs.


Top-Flight Communication Keeps You Up to Date on Your Project


Upland Fab makes customer communication a top priority. We provide consistent, reliable communication throughout every step of your project. You’ll have a single point of contact from start to finish, providing you with regular updates and, more importantly, the peace of mind that comes from knowing that your project is progressing on schedule.


Contact Us Today to Discover the Upland Edge


Upland Fab is your #1 source for precision machined acetal plastic parts and components. Request a quote to get started, or contact us to discuss your next project.


Properties of Acetal Plastic Material

ASTM or UL test Property Acetal
Delrin ®
Delrin ® AF
D792 Density (lb/in³)
D570 Water Absorption, 24 hrs (%) 0.2 0.2 0.2
D638 Tensile Strength (psi) 9,500 11,000 8,000
D638 Tensile Modulus (psi) 400,000 450,000 435,000
D638 Tensile Elongation at Break (%) 30 30


D790 Flexural Strength (psi) 12,000 13,000 12,000
D790 Flexural Modulus (psi) 400,000 450,00 435,000
D695 Compressive Strength (psi) 15,000 16,000 16,000
D695 Compressive Modulus (psi) 400,000 450,000 350,000
D785 Hardness, Rockwell M88/R120 M89/R122 M85/R115
D256 IZOD Impact Notched (ft-lb/in) 1.0 1.0 0.7
D696 Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)
5.40 4.70 5.00
D648 Heat Deflection Temp (°F / °C)
at 264 psi
220 / 104 250 / 121 244 / 118
D3418 Melting Point Temp (°F / °C) 335 / 168 347 / 175 347 / 175
- Max Operating Temp (°F / °C) 180 / 82 180 / 82 180 / 82
C177 Thermal Conductivity
(x 10-4 cal/cm-sec-°C)
UL94 Flammability Rating HB HB HB
D149 Dielectric Strength (V/mil) short time, 1/8" thick 420 450 400
D150 Dielectric Constant at 1 MHz 3.8 3.7 3.1
D150 Dissipation Factor at 1 MHz 0.005 0.005 0.010
D257 Volume Resistivity (ohm-cm) at 50% RH 1015 1015 3.0 x 1016

[Acetal material chart]


Contact Upland Fab to Learn More About Acetal Plastic Machining


Upland Fab has been providing top-flight plastic and composite machining in Southern California since 1970. Contact us or request a quote to get started on your project.

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