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Delrin Machining

A Guide to Delrin CNC Machined Parts: Properties, Applications and Design Considerations

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.

Main Attributes of Delrin®:

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

Detailed information about Delrin for designers can be found in the tabs below. Please note: this information is provided as a guide only.

Delrin® Machining Service - Delrin Milling & Turning

Penta Precision supplies highly accurate Delrin machined parts throughout the UK. Customers turn to us when they have had quality and delivery issues with their existing suppliers and need a reliable precision machining partner.

We communicate well with customers, we take care with the projects placed with us and we are consistent in our service delivery. See our Proven Process page to find out more about our winning formula.

"I have always found Penta to be very professional when dealing with them. I find good communication to be very important which Penta excel at." Ben - Buyer

Penta Precision provides the following Delrin machining services:

CNC milling – prototypes & large batch runs
CNC turning – prototypes & large batch runs
Insert installation
Part marking
Manual milling
Manual turning
Machining design advice
Machining drawing service

Reasons to Choose Penta:

ISO 9001:2015 quality assurance
Consistent high quality machined parts
Reliable delivery dates - our track record speaks volumes
Exceptional customer service and communication
Machining design advice
Extensive experience in our field

We are regularly machining Delrin for customers all over the UK. Our customers depend on our machining expertise as well as our outstanding delivery performance, to machine the highest quality parts. If you'd like to discuss how we can help you with your Delrin machining requirements, here's a list of ways to get in touch with us.

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

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

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

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

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

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)

50mm/min

DIN EN ISO 527-2

Tensile Strength at Yield (MPa)

50mm/min

DIN EN ISO 527-2

Elongation at Yield (%)

50mm/min

DIN EN ISO 527-2

Elongation at Break (%)

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)

Max 7,5J

DIN EN ISO 179-1eA

Ball Indentation Hardness (MPa)

185

ISO 2039-1

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

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)

23-60°C, long

DIN EN ISO 11359-1;2

Thermal Expansion (CLTE) (10-₅ K-₁)

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	Value	Parameter	Norm
Specific Surface Resistance (Ω)	10₁₄	-	DIN IEC 60093

Electrical Properties

Value

Parameter

Norm

Specific Surface Resistance (Ω)

10₁₄

DIN IEC 60093

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.

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

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.