Pure
PTFE
PTFE´s
high chemical resistance against a wide
spectrum of different mediums makes it an exceptional
sealing material for aggressive fluids. Altona
manufactures pure PTFE gaskets and PTFE materials
for a wide range of applications:
Pure
PTFE Rings & Customised Parts:
Pure PTFE is formed into rings to fit standard flanges
or it may be made to customer specified dimemsions. It is suitable
for a wide range of applications which includes O-rings, glide rings
for internal sealing and piston stepped rings.
Pure PTFE Envelopes:
Pure PTFE envelopes are used as an external protective jacket for conventional gasket
materials like rubber. They are of three basic types:
"Slit" Type or Type V in which the gasket is slit to a V shape
"Square " type or Type M where the gasket is machined so that the inner base is flat.
"Folded" type or Type U where the inner base is rounded like a U.
Pure
PTFE Specifications
|
|
Operating
Temperature
|
260oC
max
|
Melting
Point
|
327oC
|
Density
|
2.14
to 2.19 g/cm3
|
Tear
Strength at 23oC
|
29
to 39 N/mm2
|
Tear
Strength at 150oC
|
14
to 20 N/mm2
|
Shore
D - Hardness
|
55
to 72
|
|
Expanded
PTFE
Made of 100%
pure PTFE which
is expanded using a special
process that produces a uniform
and highly fibrillated micro-
structure. This results in a
gasket material
with all the
excellent chemical resistant properties of PTFE but with very good
sealing charaterisistics.
Expanded PTFE is soft and pliable yet surprisingly tough. It is
resistant to pressing,
creep relaxation and cold flow. It seals uneven surfaces very well
and may even be used in
damaged flanges. Highly inert and a very "clean" material. It is
recomemnded for use with
potable water and for the food industry. For higher dynamic loadings
expanded PTFE with
stainless steel insertion is available.
Available in sheets, and as joint sealant.in ribbon tape or rolls
Sheet dimemsion: 1500mm x1500mm 0.8mm to 6mm thick
Tape and Joint Sealant: 1.5mm to 6mm thick, width 3mm to
40 mm
Expanded
PTFE Specifications
|
|
Operating
Temperature
|
260oC
max
|
Sealability
(ASTM F37)
|
0.16ml/hr
|
Compressibility
(ASTM F-36)
|
66%
|
Recovery
(ASTM F-36)
|
29
to 39 N/mm2
|
Creep
relaxation (ASTM F-38)
|
38%
|
|
All
information on this web site is meant as a general guide only.
The complex nature of sealing applications does not allow any
warranty to be given on the use of the information in determining
the suitability of a product for a given application.
|