PTFE (Teflon) Machining

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

What is PTFE?

PTFE (Polytetrafluoroethylene) is a semi-crystalline fluropolymer thermoplastic. It is commonly referred to as Teflon which is a brand name.

PTFE is the most widely used fluropolymer in a range of applications. It is known for being highly resistant to chemicals and for its superior thermal stability.

Compared to other engineering grade thermoplastics it has poor mechanical properties, though glass and carbon filled grades with improved dimensional stability are available.

Because of its resistance to chemicals, PTFE is commonly used in chemical, food and pharmaceutical engineering.

PTFE is favoured over PVDF for sliding applications with exposure to extreme chemical stress.

Main Attributes of PTFE:

Excellent chemical resistance
Good electrical insulating properties
Wide working temperature from -260°C to 260°C
Very low coefficient of friction
Poor mechanical properties – glass and carbon filled modifications available to improve dimensional stability
Low flammability
High UV and weather resistance
Suitable for food contact
Water resistant
High impact strength
No moisture absorption

GET PTFE MACHINING QUOTE

Need a part machined by an experienced and reliable components manufacturer? Simply complete our short form to receive your no obligation quotation.

Name:*

Company Name:*

Email address:*

Telephone number:*

Enquiry details:

File upload:

How this information is used

Your data will not be shared with third parties
You will only be contacted via the channels you have opted in to
Your data will only be stored for these purposes

Telephone Calls:

Tick this box if you would like to receive marketing telephone calls

Direct Mail:

Tick this box if you would like to receive direct mail marketing

Emails:

Tick this box if you would like to receive marketing emails

Enter not this field:

*Indicates a field you must enter.

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

PTFE Machining Service - PTFE Milling & Turning

Penta Precision supplies highly accurate PTFE 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.

"Customer service is always very professional with everything done to a great detail expertise. Final product is also to a very high standard." Russell - Engineering Maintenance for Production Lines

Penta Precision provides the following PTFE 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 PTFE 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 PTFE machining requirements, here's a list of ways to get in touch with us.

Mechanical Properties	Value	Parameter	Norm	Notes
Tensile Strength	22 MPa		ASTM D 4894	Tested on extruded and machined specimen
Elongation at Break	220%		ASTM D 4894	Tested on extruded and machined specimen
Compression Strength	5 MPa	1% strain	ASTM D 695
Shore Hardness	55	Shore D	ASTM D 2240

Mechanical Properties

Value

Parameter

Norm

Notes

Tensile Strength

22 MPa

ASTM D 4894

Tested on extruded and machined specimen

Elongation at Break

220%

ASTM D 4894

Tested on extruded and machined specimen

Compression Strength

5 MPa

1% strain

ASTM D 695

Shore Hardness

Shore D

ASTM D 2240

Thermal Properties	Value	Parameter	Norm	Notes
Glass Transition Temperature	-20°C		DIN EN ISO 11357	Found in public sources
Service Temperature	260°C	short term		Found in public sources. Individual testing regarding application conditions is mandatory
Service Temperature	260°C	long term
Thermal Expansion (CLTE)	13 10^-5 K^-1	23-100°C, long	ASTM D 696
Thermal Conductivity	0.20 W/(K*m)		ASTM C 177

Thermal Properties

Value

Parameter

Norm

Notes

Glass Transition Temperature

-20°C

DIN EN ISO 11357

Found in public sources

Service Temperature

260°C

short term

Found in public sources. Individual testing regarding application conditions is mandatory

Service Temperature

260°C

long term

Thermal Expansion (CLTE)

13 10^-5 K^-1

23-100°C, long

ASTM D 696

Thermal Conductivity

0.20 W/(K*m)

ASTM C 177

Electrical Properties	Value	Parameter	Norm	Notes
Specific Surface Resistance	10¹⁶ Ω		ASTM D 257	Without defects
Specific Volume Resistance	10¹⁷ Ω*cm		ASTM D 257
Dielectric Strength	80 kV/mm	In air, 0.125mm thick	ASTM D 149
Dielectric Constant	2.1	50-109Hz	ASTM D 150

Electrical Properties

Value

Parameter

Norm

Notes

Specific Surface Resistance

10¹⁶ Ω

ASTM D 257

Without defects

Specific Volume Resistance

10¹⁷ Ω*cm

ASTM D 257

Dielectric Strength

80 kV/mm

In air, 0.125mm thick

ASTM D 149

Dielectric Constant

2.1

50-109Hz

ASTM D 150

Other Properties	Value	Parameter	Norm	Notes
Water Absorption	<0.01%	23°C	ASTM D 570
Flammability (UL94)	V0	Corresponding to	DIN IEC 60695-11-10	Corresponding means no listing at UL (yellow card). The information might be taken from resin, stock shape or estimation. Individual testing regarding application conditions is mandatory.
Density	2.15 g/cm³

Other Properties

Value

Parameter

Norm

Notes

Water Absorption

<0.01%

23°C

ASTM D 570

Flammability (UL94)

Corresponding to

DIN IEC 60695-11-10

Corresponding means no listing at UL (yellow card). The information might be taken from resin, stock shape or estimation. Individual testing regarding application conditions is mandatory.

Density

2.15 g/cm³