What is Delrin?
Delrin is a brand name for an Acetal homopolymer made solely by DuPont™. Together with Acetal copolymers, Delrin is an engineering plastic known for being amongst the strongest and stiffest of all thermoplastics.
Delrin has excellent machinability and therefore there are few restrictions to consider when machining.
Sharp cutting tools are recommended to avoid chipping during machining.
You may also see Delrin referred to as:
- POM-H
- Grades. DuPont offer a good variety of grades including those with medium-high viscosity, low VOC emissions and food and healthcare grades.
- Delrin® 100P / 100PE / 100TE / 100STE / 100ST / 100
- Delrin® 300CP / 300PE / 300TE / 300CP NC010
- Delrin® 500P / 500PE / 500TE / 500T
- Delrin® 127UVE / 327UVE / 527UVE (UV resistant)
- Delrin® FG400MTD BLA079 (metal detectable)
- Delrin® FG400XRD NC010 (X-Ray detectable)
Main attributes
- Dimensional stability before, during and after machining
- Low moisture absorption
- Good chemical resistance to fuels and solvents
- Low friction and high wear resistance
- Wide operating temperature range (-40°C to 120°C)
- Good compressive strength
- Good shock resistance
- Easy to machine
Delrin in comparison to Acetal Copolymers
- Stiffer
- Higher flexural modulus at room temperature
- Higher impact strengths at room temperatures and low temperatures
- Tensile strength is approximately 10-15% higher than comparable copolymers
- Slightly higher continuous use temperature than copolymer (95°C vs. 90°C)
- Lower thermal expansion rate
- Better wear resistance
Common Applications
- Structural components
- Gears & driveshafts
- Safety restraints
- Bearings & bushings
- Handles
Note for designers
When machined, Delrin produces very few post machining burrs, meaning the process of de-burring can be avoided, saving precious time in manufacturing.
Delrin is slightly more expensive than Acetal Copolymers due to the technical benefits. DuPont claim that the use of Delrin allows for thinner and lighter part design and therefore potential for cost reductions.
UK Stock Sizes
Please note we do not supply stock material, the information provided is purely for design and research purposes.
Stock sizes have a +/+ tolerance as the extrusion process is not as accurate as precision machining.
Stock finishes are often scratched and dented, some sheet plastics come with a protective coating, however because of long suppy chains these can still be scratched underneath.
Example Delrin Stock Sizes
Stock sizes will vary depending on supplier. Please get in contact to discuss further.
Delrin Plate
Available in White and Black although some sizes only available in black or white (indicated * for white or ** for black)
| 6 x 500 | +0.20/+0.70 |
| 8 x 500* | +0.20/+1.10 |
| 10 x 500 | +0.20/+1.10 |
| 12 x 500 | +0.30/+1.50 |
| 16 x 500* | +0.30/+1.50 |
| 20 x 500 | +0.30/+1.50 |
| 25 x 500 | +0.30/+1.50 |
| 30 x 500 | +0.50/+5.00 |
| 40 x 500 | +0.50/+5.00 |
| 50 x 500 | +0.50/+5.00 |
| 60 x 500* | +0.50/+3.50 |
| 80 x 500** | +0.50/+5.00 |
| 100 x 500** | +0.50/+5.00 |
Delrin Round Bar
Available in White and Black although some sizes only available in white (indicated *)
| Ø10* | +0.10/+0.70 |
| Ø12* | +0.20/+0.80 |
| Ø16 | +0.20/+0.80 |
| Ø18* | +0.20/+0.80 |
| Ø20 | +0.20/+0.80 |
| Ø22* | +0.20/+1.00 |
| Ø25 | +0.20/+1.00 |
| Ø28* | +0.20/+1.00 |
| Ø30 | +0.20/+1.00 |
| Ø32 | +0.20/+1.20 |
| Ø36* | +0.20/+1.20 |
| Ø40 | +0.20/+1.20 |
| Ø45 | +0.30/+1.30 |
| Ø50 | +0.30/+1.30 |
| Ø56* | +0.30/+1.30 |
| Ø60 | +0.30/+1.60 |
| Ø65 | +0.30/+1.60 |
| Ø70 | +0.30/+1.60 |
| Ø75 | +0.40/+2.00 |
| Ø80 | +0.40/+2.00 |
| Ø90* | +0.50/+2.20 |
| Ø100 | +0.60/+2.50 |
| Ø110* | +0.70/+3.00 |
| Ø125 | +0.80/+3.50 |
| Ø135* | +0.90/+3.80 |
| Ø150* | +1.00/+4.20 |
| Ø160* | +1.10/+4.50 |
| Ø165* | +1.20/+5.00 |
| Ø200* | +1.30/+5.50 |
Plate stock lengths may vary between 2,000mm and 3,000mm
Technical properties
Mechanical properties
| Mechanical Properties | Value | Parameter | Norm | Comments |
| Modulus of Elasticity (Tensile Strength) (MPa) | 3400 | 1mm/min | DIN EN ISO
527-2 | For tensile test: specimen type 1b |
| Tensile Strength (MPa) | 79 | 50mm/min | DIN EN ISO 527-2 | |
| Tensile Strength at Yield (MPa) | 79 | 50mm/min | DIN EN ISO 527-2 | |
| Elongation at Yield (%) | 37 | 50mm/min | DIN EN ISO 527-2 | |
| Elongation at Break (%) | 45 | 50mm/min | DIN EN ISO 527-2 | |
| Flexural Strength (MPa) | 106 | 2mm/min | DIN EN ISO 178 | For flexural test:supoort span 64mm, norm specimen |
| Modulus of Elasticity (Flexural Test) | 3600 | - | DIN EN ISO 178 | |
| Compression Strength (MPa) | 19/33 | 1% / 2%, 5mm/min, 10N | EN ISO 604 | Specimen 10x10x10mm |
| Compression Modulus (MPa) | 2700 | 5mm/min, 10N | EN ISO 604 | Specimen 10x10x50mm, modulus range between 0.5 and 1% compression |
| Impact Strength (Charpy) (KJ/m^2) | n.b. | Max 7,5J | DIN EN ISO 179-1EU | For charpy test: support span 64mm, norm specimen. nb = not broken |
| Notched Impact Strength (Charpy) (KJ/m^2) | 15 | Max 7,5J | DIN EN ISO 179-1eA | |
| Ball Indentation Hardness (MPa) | 185 | - | ISO 2039-1 | |
Thermal properties
| Thermal Properties | Value | Parameter | Norm | Comments |
| Glass Transition Temperature (°C) | -60 | - | DIN 53765 | Found in public sources |
|
| Melting Temperature (°C) | 182 | - | DIN 53765 | |
|
| Service Temperature (Short Term) (°C) | 150 | - | - | Found in public sources. Individual testing regarding application conditions is mandatory |
|
| Service Temperature (Long Term) (°C) | 110 | - | - | |
|
| Thermal Expansion (CLTE) (10-5 K-1) | 12 | 23-60°C, long | DIN EN ISO 11359-1;2 | |
|
| Thermal Expansion (CLTE) (10-5 K-1) | 13 | 23-100°C, long | DIN EN ISO 11359-1;2 | |
|
| Specific Heat (J/g*K) | 1.3 | - | ISO 22007-4:2008 | |
|
| Thermal Conductivity W/(K*m) | 0.43 | - | ISO 22007-4:2008 | |
Electrical properties
| Electrical Properties | Value | Parameter | Norm |
| Specific Surface Resistance (Ω) | 1014 | - | DIN IEC 60093 |
Other Delrin properties
| Other Properties | Value | Parameter | Norm | Comments |
| Water Absorption (%) | 0.05/0.1 | 24h/96h (23°C) | DIN EN ISO 62 | Øca, 50mm, h=13mm |
| Flammability | HB | Corresponding to | DIN IEC 60695-11-10 | Corresponding mean no listing at UL (yellow card). the information might be taken from resin, stock shape or estimation. Individual testing regarding application conditions is mandatory. |
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