REGISTER OVERVIEW PLASTICS

PTFE
Properties of PTFE (polytetrafluoroethylene)
Material density:
2.2 – 2.3 g/cm 3
Service temperature:
-200 to +260/280 °C (20.000 hours/temporary)
Temporary = only a few hours, where no or only low loads may
occur
Fluorosint ® grades:
Also offer excellent mechanical properties (rigidity/creep strength,
wear resistance) paired with outstanding chemical resistance.
Main properties of PTFE:
• High upper continuous service temperature limit in air 260 °C
• Almost universal chemical resistance
• Excellent chemical and hydrolysis resistance
• Very high anti-adhesion level
• Outstanding UV and weather resistance
• Good electrical insulating properties
• Non-filled grades are physiologically safe
• Good mechanical stressability
• Incombustibility according to UL standard
• Very low coefficient of friction
Comment:
If heated to temperatures above 320 °C, PTFE can lose gaseous
decomposition products, some of which are toxic.
Due to their outstanding chemical resistance, PTFE films/boards
do not stick without being etched on one side. (Please indicate if
sticking may be necessary when ordering.)
Grade: PTFE colour (white)
Modified PTFE = PTFE with glass
= PTFE with carbon
= PTFE with graphite
= PTFE with bronze
PTFE etched on one side (can be stuck)
How properties tend to be influenced by fillers,
compared to non-filled PTFE
+ = enhanced
– = reduced
o = unchanged
PTFE PTFE PTFE PTFE
with
glass
with
carbon
with
graphite with bronze
Density + – – +
Tearing strength – – – –
Elongation at tear – – – –
Ball indentation hardness + + + +
Compressive strength + + + +
Wear resistance + + + +
Coefficient of friction + + + +
Thermal expansion – – – –
Usable temperature range o o o o
Thermal conductivity o + + +
Electrical conductivity o + + +
Dielectric strength – – – –
Porosity + + + +
Telephone hotline: +49 1803 00 26 22 40 / Fax hotline: +49 1803 00 26 22 41 9 cents/60 sec. from the German fixed network
PLASTICS 13/83
Fluorosint ® 500 (ivory) grade
Reinforced PTFE with synthetic mica (high mechanical loadcarrying
capacity, approx. 9x less deformation under load than
non-filled PTFE).
Fluorosint ® 207 (white) grade
Outstanding chemical and hydrolysis resistance with good
mechanical load-carrying capacity, complies with EN and FDA
regulations regarding compatibility with foodstuffs.
For data sheet, see page 13/78.
Application: PTFE
Preference is given to PTFE grades with approval under foodstuffs
legislation in laboratory engineering and in the food and
pharmaceutical industries. Modified grades are used primarily
in the petrochemical, chemical, metallurgical, paper, textile and
nuclear industries.
PTFE types – Their use and modification:
PTFE
nonfilled
PTFE
with
glass
PTFE
with
carbon
Almost universally resistant to
chemicals, very good sliding
properties, high temperature
resistance, good dielectric
properties, high level of antiadhesion
Pressure-resistant material
with good frictional and wear
behaviour, with good chemical
resistance
Pressure and wear-resistant
material, largely resistant to
chemicals with good thermal
conductivity, anti-static
PTFE Largely resistant to chemicals
with with good thermal conductivity,
graphiteanti-static
with good abrasion
resistance
PTFE Good thermal conduction,
with good abrasion resistance,
bronze good compressive strength
Linings in the
chemicals industry,
flat seals, enclosures,
compensators, electrical
insulating parts,
chambered bearings
Pressure-resistant seals,
bearings, valve seats,
piston rings, shaft seals,
piston rod glands
Piston rings,
piston guide rings,
bearings, glands,
valve seat rings
Lip seals,
shaft seals,
sliding films, seals
Slideways in general
machine tools, pillar
guides, bearings,
hydraulic cylindrical
guides
Certain properties of PTFE can be optimised for the individual
application in question through the targeted addition of fillers.
The compound should be selected taking all physical and chemical
properties of the filler and the compound into account.
Processing:
Machining, see machining information
Do not smoke when cutting PTFE, it is inflammable!
Important: When cutting precise finished products, please note
that a sudden volume change of around 1.3 % occurs at a temperature
of approximately 19 °C. (This is caused by a devitrification of
the PTFE macromolecules.)
It is only possible to stick PTFE films/boards in a "design etched
on one side". (Please indicate if sticking may be necessary when
ordering.)
Dimensions: Round rods Boards Hollow bars/tubes
PTFE 5 – 250 mm d 1 – 100 mm thick 20 – 500 mm od
Film 0.2 – 1.5 mm
For PTFE impregnated glass fabric, see page 13/89.