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100% PTFE Gasket Sheeting. The best choice for
economical plant-wide use on services to 260°C
and pressures to 200 bar.

KLINGERsoft-chem sheeting is 100% expanded PTFE processed to produce a uniform and highly
fibrillated microstructure with multi-directional fibres.
Note the following advantages of KLINGERsoft-chem in your application:
• Highest sealability
• Excellent chemical resistance
• Lowest gas- and fluid permeation
• Prevention of corrosion
• Resistant against steam and condensate
• High compressibility
• Excellent compensation of irregularities of the sealing surface
• Superior creep resistance
• Overloading is practically impossible
• Very easy to process
A soft, pliable, yet very strong gasket with superior creep resistance and cold flow compared to standard PTFE
products. KLINGERsoft-chem is ideal for sealing uneven and damaged flanges. It is easy
to cut and install and requires only low compressive load to seal on all flange material types.
The many and varied demands made on gaskets
The successful operation of a gasket depends upon a multiplicity of factors. Many who use static gaskets believe
that the values quoted for maximum admissible temperature and maximum operating pressure are inherent
properties or characteristics of gaskets and gasket materials.
Unfortunately, this is not the case. The maximum temperatures and pressures at which gaskets may be
used are influenced by a large number of factors. Therefore a definite statement of
these values for gasket material is not possible.
So why does Klinger provide pT diagrams?
For the reasons given the pT diagram
is not infallible: it serves as a rough
guide for the end user who often has only the operating temperatures and
pressures to go on.
Additional stresses such as
greatly fluctuating load may
significantly affect whether a gasket is
suitable for the application.
Resistance to media must be
taken into account in every case.
The fields of decision
(1) If your operating temperatures
and pressures fall within this field,
a technical examination is normally
(2) If your operating temperatures
and pressures are within this field,
a technical examination is
(3) If your operating temperatures
and pressures are within this “open“
field, a technical examination is
always necessary.
Klinger cold/hot compression
With this test method developed by Klinger you can evaluate the cold/hot
compression of a gasket in cold and hot condition.
Unlike the method acc. to DIN 52913 and BS 7531, the surface load
is kept constant during the complete test so that the gasket is exposed to
much tougher conditions. The thickness decrease at an
ambient temperature of 23°C and at heating up to 300°C is measured.
The indicated thickness decrease at 300°C refers to the thickness
obtained after loading at 23°C.
Important points to be observed
The selection of gaskets requires expertise and know-how since ever
greater reliability coupled with the lowest possible leakage rates are
demanded of gasket materials. The exacting demands made on
the tightness of gasket materials (e.g. Tightness class L0.01) mean that with
increasing internal pressure higher surface pressures must be applied to
the gasket.
It must be shown that the flange joint will tolerate the demands made
on it without being mechanically overloaded. Furthermore, the surface
pressure applied to create the seal should never fall below the required
minimum value since this will reduce the life of the gasket. Highly stressed,
but not overstressed gaskets have a longer life than understressed
If the gasket fitted will be subjected to non-static loading, or
will suffer stress fluctuations during discontinuous operation, it is
advisable to choose a gasket which is not prone
to embrittlement with increasing temperature (e.g.
KLINGER-graphite laminate or KLINGERtop-chem), especially for
steam and/or water applications. For discontinuous operations in
water and/or steam applications, we recommend as a general guide a
surface pressure of about 30 MPa. In such cases the gasket should be
as thin as is practicable. For reasons of safety, we
advise against the re-use of gaskets.
Typical values for 1,5 mm thickness
Stress relaxation % 35
Tightness according DIN 28090 mg/s m. 0,01
Klinger cold/hot compression 25 MPa thickness decrease at 23°C % 37
thickness decrease at 300°C % 28
Compressibility ASTM F 36 J % 60
Recovery ASTM F 36 A min. % 12
Tensile strength ASTM 152 MPa 10
Chemical resistance ph 0-14
Density g/cm3 0,85
Dimensions of the standard sheets
1500 mm x 1500 mm
1.5 mm, 3.0 mm,
thickness ± 10%
length ± 50 mm, width ± 50 mm
Ideal for applications requiring a minimum of sealing stress up to moderate cond'ns
of pressure and temperature: Lid seals, GRP flanges, plastic flanges,
glass-lined flanges, agressive / corrosive media processes, pitted / uneven flanges
With this in mind, please also observe our installation instructions.
Tests and approvals
The components of KLINGERsoft-chem are fully compatible with FDA requirements.
Certification for food toleration:
Standford Consult. Laboratories
Neuseeland MAF,
Standford Consult. Laboratories
Australia AS 4020.