Design elements based on Elring PTFE Outstanding properties for many applications

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Design elements based on Elring PTFE

Outstanding properties for many applications

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Design elements based on Elring PTFE

Elring's mastery is unrivalled when it comes to making the most out of plastics.

We offer a wide range of materials. Specifically tailored to your specific requirements. PTFE – an extremely versatile, heavy-duty plastic provides the outstanding inspiration for many new product ideas.

PTFE can be used as a construction material either alone or as a solid com-pound integrating metals, elastomers and other plastics. It is durable even

under extreme conditions. In addition to PTFE, we also machine other heavy-duty plastics, such as

❚ PE-UHMW (ultra-high molecular weight polythene),

❚ POM (polyoxymethylene),

❚ PA (polyamide),

❚ PEEK (polyetherether ketone),

Skilled, professional machining is crucial to the quality and functioning of the com-ponents. From made-to-order manufac-ture to streamlined series production.

At the same time, we are constantly improving our production processes

and developing new methods of quality assurance. Our experience in this specialist field and our certified, integrated quality management system are our guarantee that Elring products and Elring solutions are capable of meeting customer requirements.

The product and application examples described in this brochure are intended

to serve as inspiration for design and development engineers. We hope you will see us as the ideal partners when it comes to implementing and optimising product ideas and ensuring perfect performance.

So: your request is Elring's command. Take us at our word!

PTFE is an unbranched linear polymer composed of carbon, fluorine and characterised by extraordinary properties.

❚ It is resistant to almost all chemicals.

Due to the extremely stable bond between the fluorine and carbon atoms and the near-complete screening of the chain of carbon atoms by the fluorine atoms, PTFE is almost universally resis-tant to chemicals. Only hydrocarbon compounds containing fluorine and mol-ten alkali metals lead to swelling of PTFE or to a limited chemical reaction of the surface. There is no water absorption, not even after an extended period of exposure. Even under extreme climatic conditions, PTFE proves to be weather-resistant to a practically unlimited

degree. Its good physiological properties are also worthy of mention.

❚ High thermostability over a wide temperature range. PTFE is thermally stable from -200 °C to +260 °C.

❚ Good anti-friction properties, even during dry runs.

PTFE has a low friction coefficient of 0.22 to 0.25. The static coefficient of friction and the dynamic coefficient of friction are almost identical, so that the so-called stick-slip effect does not occur, even at very low sliding speeds.

❚ Excellent anti-adhesive properties.

The adhesion of PTFE is very low. This property is the result of the firm bond

between the chain of carbon atoms and the fluorine atoms as well as to their minimal polarising influence.

Bonding PTFE is difficult; after chemical pretreatment however, an adhesive bond can be formed with good adhesive strength.

❚ Good electrical properties.

PTFE is characterised by excellent diel-ectric properties, which remain almost constant over a wide temperature range. Added to this is a very low dielectric constant combined with a low loss factor.

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Properties of fluoroplastics

Influence of fillers on the properties and applications of PTFE

PTFE without fillers PTFE filled with glass fibre PTFE filled with carbon PTFE filled with graphite PTFE filled with bronze PTFE filled with carbon fibre

❚ Almost universal resistance to chemicals

❚ Good electrical and dielectric properties

❚ High continuous working temperature

❚ Good anti-adhesive properties

❚ Low coefficient of friction

❚ Extremely good sterilisability

❚ High compressive strength and wear resistance

❚ Better thermal conductivity than PTFE without fillers

❚ Extremely good resistance to chemicals

❚ Good dielectric properties

❚ High compressive strength and hardness

❚ Good frictional and wearing properties

❚ Good thermal conductivity

❚ Resistant to most chemicals

❚ Low volume and surface resistance

❚ Good frictional properties

❚ Low coefficient of friction

❚ Improved electrical conductivity

❚ Good frictional and wearing properties

❚ Minimal cold flow

❚ Low resistance to chemicals

❚ Little deformation under load

❚ Good wear resistance

❚ Good electrical conductivity

Properties Materials

The mechanical properties of PTFE can be significantly influenced by the processing methods. The degree of crystallisation and above all by additives such as glass fibre, powdered metal, carbon, etc., improve the cold flow properties, wearing properties and

thermal conductivity. This permits optimum adaptation to the conditions of each specific application.

The effects of the most important fillers on the properties of PTFE are listed in the table below.

❚ Design elements for fittings used in the chemical and foodstuffs industries

❚ Medical apparatus

❚ Linings and coverings for chemical apparatus construction

❚ Sheathing for heating elements in electroplating and semiconductor manufacture

❚ Insulators for electrical engineering and electronics

❚ Flat and shaped gaskets, sleeves

❚ Compensators, bellows, diaphragms

❚ Conical nipples and valve seats for fittings used in the chemical and foodstuffs industries

❚ Insulators for electrical machine construction

❚ Thrust rings

❚ Design elements requiring anti-static properties

❚ Friction bearings, valve bodies, valve seats for chemical apparatus construction

❚ Piston sealing and guiding elements for dry-running compressors

❚ Radial shaft seals

❚ Slip sheets requiring anti-static properties

❚ Slide linings for slide guides in mechanical engineering

❚ Friction bearings

❚ Roller coatings

Applications

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PTFE bellows

Fields of application:

❚ Expansion joints in piping systems

❚ Screening for sterile areas in bottling plants

❚ Aseptic valves

❚ Solenoid valves

❚ Metering equipment

Advantages:

❚ Almost universal resistance

❚ Also suitable for foodstuffs and pharmaceutical products

❚ Extremely good sterilisability

❚ Anti-adhesive

❚ Wide temperature range from -60 °C to +200 °C

❚ Streamlined series production, from own-manufactured, semi-finished products to finished end products

Materials:

❚ Normally PTFE without fillers (special types, depending on the conditions of the specific application)

❚ The clamping flange, the conical nipple or the bearing ring can be made of a PTFE compound (e.g. glass fibre or ceramic) for applications involving metering, shut-off and sealing elements

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Fold designs and construction types

Significant expansion, for pressures up to 1 bar

Moderate expansion, for pressures up to 6 bar, depending on thickness of folds

Slight expansion,

for pressures up to 10 bar, depending on thickness of folds

Different connecting configurations

Bellows with sintered conical nipple and retaining flange made of PTFE compound

For example: solenoid valves designed for strokes up to 2 mm and 50 million cycles

Designed to allow a sealing plug to be buttoned on

If high pressures are anticipated, steel rings can be inserted to better protect lathed folds against deformation.

We will gladly advise you on all technical design matters. Please ask for a copy of our technical questionnaire.

Pointed folds, plunged without cutting

Rounded, lathed folds

Rectangular, lathed folds

For example: aseptic valves

Pointed folds, plunged without cut-ting, with conical nipple

Pointed or plunged folds

PTFE bellows

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Diaphragms

Chemical resistance to aggressive fluids, flexibility and a long service life are the characteristics most frequently demanded of diaphragm materials and designs.

PTFE diaphragms are used in metering equipment, in the pharmaceuticals and foodstuffs industries, in pumps for the chemical industry and in painting plants.

The stroke of the diaphragm is deter-mined by the shape and design of the beads, as well as by its effective diameter.

Specially treated PTFE sheets and sheets made of modified PTFE (TFM) are used to prolong the service life.

PTFE elastomer diaphragms are suitable for applications where severe loads are common (pressure, fluids, stroke). The forces that result from deformations are absorbed by the elastomer (e.g. NBR, HNBR, EPDM, fluororubber), while the PTFE lining, which is permanently bonded to the elastomer, provides protection against aggressive fluids.

It is vital that the design and materials chosen for the diaphragms be adapted to the conditions of the specific applica-tion, in the interests of ensuring trouble-free operation.

We will gladly advise you on all technical design matters.

Please ask for a copy of our technical questionnaire.

PTFE diaphragm for low metering rates in the pharmaceuticals industry

PTFE diaphragm for high metering rates in the chemical industry

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PTFE agitator blade

with sintered solenoid

Field of application:

❚ Electroplating

Hot roller with PTFE lining

❚ LED high-speed printers

❚ Operating temperature: 220 °C

❚ Good wear resistance

❚ Anti-adhesive properties vis-à-vis toners

PTFE packing

❚ Beverage bottling plant

PTFE in product applications

PTFE valve body

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PTFE tubing module

❚ Analysis equipment

Example: Degassing station of an HPLC measuring system.

The module consists of a bundle of PTFE tubings, which are welded into PTFE plugs at both ends. These micro-thin PTFE tubings act as degassing diaphragms for the test fluid.

PTFE electroplater

❚Dental equipment

For electroplating gold crowns, inlays and blocks, and for manufacturing ceramic and plastic veneers.

Trockar tube

❚Minimally invasive surgery

This device has a spiral PTFE tubing that allows operations to be performed with relatively little loss of blood.

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Liquid level measuring device

❚ Foodstuffs industry

❚ Chemical industry

❚ Pharmaceuticals industry

Probe with a PTFE coating for protection against aggressive fluids, welded on the face.

Other variants:

Temperature sensor with PTFE coating

PTFE tubings

❚ Chemical, electrical, instrumentation and automatic control engineering

❚ Sliding sheath for Bowden cables

❚ Feed tubings for paint spraying plants

❚ Catheter tubing for medical apparatus

Our sales information sheet on "PTFE tubings" will provide you with further details.

PTFE in product applications

Shrink-on tubing PTFE

FEP

Corrugated tubing PTFE

High-pressure tubing PTFE

Tubing fittings/couplings PA / PP / PVDF / PTFE / PFA

Tubing types and accessories Materials Design

Please refer to our "PTFE tubings" brochure for further details.

Paste-extruded tubing according to customer's drawing. Other designs on request.

Tubings made of PA, for example, with PTFE inliner tubing for protection against aggressive fluids. Stainless-steel braid. Other designs on request.

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Material/design

Width in mm

Thickness in mm

PTFE sheet,

natural, unetched

PTFE sheet,

etched

PTFE sheet

with fillers:

60 % bronze 10 % glass fibre 25 % carbon 5 % graphite

10 % glass fibre + 10 % graphite

PTFE sheet,

SKAP type,

self-adhesive on one side

PTFE sheet,

copper clad on one side

PTFE sheet,

copper-clad on both sides

Glass cloth sheet, type A,

PTFE-coated on both sides

Glass cloth sheet, type AP,

PTFE-coated on both sides,

PTFE-film HN 1261

PTFE-film HN 1271,

330 330 330 500 300 x 300 300 x 300 1.000 1.000 50 150 0.05 / 0.10 / 0.15 / 0.20 / 0.25 / 0.40 / 0.50 / 0.75 / 1.0 / 1.25 / 1.50 / 2.0 / 3.0 Other dimensions on request

0.05 / 0.10 / 0.15 / 0.20 / 0.25 / 0.40/ 0.50 / 0.75 / 1.0 / 1.25 / 1.50 / 2.0 / 3.0 Other dimensions on request

0.5 / 0.75 / 1.0 / 1.25 / 1.5 / 2.0 / 3.0

Other dimensions on request

0.08 / 0.13 / 0.25

0.15 mm PTFE + 35 µm Cu 0.5 mm PTFE + 35 µm Cu 1.5 mm PTFE + 35 µm Cu 2.0 mm PTFE + 35 µm Cu Other dimensions on request

1.5 mm PTFE + 2x35 µm Cu 2.0 mm PTFE + 2x35 µm Cu Other dimensions on request

0.08 / 0.15 / 0.25

0.0065 / 0.0127 / 0.025 / 0.05 Other dimensions on request

0.05 / 0.075 / 0.1

PTFE glass cloth

The combined properties of PTFE and glass cloth ensure that

❚ the outstanding resistance to chemicals

❚ the wide temperature range (around -200 to +260 °C)

❚ the good anti-adhesive properties

❚ the dielectric properties of PTFE are preserved.

The mechanical properties, such as tear strength, compression set and flexibility, are improved by the glass cloth.

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Miscellaneous PTFE products

PTFE thread sealing strip

PTFE spray

Thickness 0.08 mm, width 12 mm, length 12 m Thickness 0.1 mm, width 12 mm, length 12 m

Release agent/lubricant (400 ml)

PTFE granules

Semi-finished PTFE products

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Design elements based on Elring PTFE

PTFE bellows

Design elements based on Elring PTFE

PTFE bellows ElringKlinger Kunststofftechnik GmbH Etzelstraße 10 D-74321 Bietigheim-Bissingen Phone ++49 (0) 71 42 / 5 83-0 ISO / TS 16949