Delrin Plastic Machining

Your guide to Delrin Plastic Machining

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Brand name for an Acetal homopolymer made solely by DuPont™

Amongst the strongest and stiffest of all thermoplastics

Dimensional stability before, during and after machining

Delrin is brand name for acetal homopolymer and has excellent machinability. It is stiffer, has a higher flexural modulus at room temperature and higher impact strengths at room and low temperatures than acetal copolymers.

This guide will take you through the main attributes, common applications, notes for designers and suitable finishing and treatments, as well as UK stock sizes and property tables. Don't forget to bookmark the page so you can refer back later.

If you are interested in Delrin machined parts, please scroll to the bottom of the page for more information about our service and to request a quote.

Delrin Guide: Properties, Applications and Design Considerations

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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 / 100T
- 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)

Industry Examples: Aerospace | Nuclear | Pharmaceutical | Electronics

Typical Components & Applications: High load mechanical applications | Brackets | Gears | Safety Restraints | Bearings | Handles | Rollers | Guides

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

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.

Can we meet your Delrin machining needs? Contact us now

UK Stock Sizes

Delrin 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

Delrin Technical Properties

Delrin 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

Delrin Thermal Properties

Glass Transition Temperature (°C)	-60	-	DIN 53765	Found in public sources
Thermal Properties	Value	Parameter	Norm	Comments
Glass Transition Temperature (°C)	-60	-	DIN 53765	Found in public sources
Melting Temperature (°C)	182	-	DIN 53765
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 (Short Term) (°C)	150	-	-
Service Temperature (Long Term) (°C)	110	-	-
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)	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
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
Specific Heat (J/g*K)	1.3	-	ISO 22007-4:2008
Thermal Conductivity W/(K*m)	0.43	-	ISO 22007-4:2008

Delrin 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.

Delrin Plastic Machined Parts

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Penta Precision provides the following plastic Delrin machining services:

CNC milling
CNC turning
Prototypes and batch runs
Insert installation
Part marking

Manual milling
Manual turning
Machining design advice
Design for manufacture service

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Delrin Plastic Machining

Your guide to Delrin Plastic Machining

__________

Delrin Guide: Properties, Applications and Design Considerations

What is Delrin?

Industry Examples: Aerospace | Nuclear | Pharmaceutical | Electronics

Typical Components & Applications: High load mechanical applications | Brackets | Gears | Safety Restraints | Bearings | Handles | Rollers | Guides

Main Attributes:

Note For Designers:

Can we meet your Delrin machining needs? Contact us now

Delrin UK Stock Sizes

Example Delrin Stock Sizes

Delrin Plate

Delrin Round Bar

Delrin Technical Properties

Delrin Mechanical Properties

Delrin Thermal Properties

Delrin Electrical Properties

Other Delrin Properties

Further Reading & Resources

Delrin Plastic Machined Parts

Penta Precision provides the following plastic Delrin machining services:

Want to know more?

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Find out how we can help you

Plastic Machining

Industry Sectors

Commitment To Quality

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