Materials

Material Specifications

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PTFE Specifications

TECHNICAL DESCRIPTION

PolyTetraFluoroEthylene is a fluorocarbon-based polymer and is commonly abbreviated PTFE. The Teflon® brand of PTFE is manufactured only by DuPont. Several other manufacturers make their own brands of PTFE which can often be used as substitute material. This fluoroplastic family offers plastics with high chemical resistance, low and high temperature capability, resistance to weathering, low friction, electrical and thermal insulation, and “slipperiness”.

GENERAL PROPERTIES

PTFE’s mechanical properties are low compared to other plastics, but its properties remain at a useful level over a wide temperature range of of -100°F to +400°F (-73°C to 204°C). Mechanical properties are often enhanced by adding fillers (see paragraph below). It has excellent thermal and electrical insulation properties and a low coefficient of friction. PTFE is very dense and cannot be melt processed — it must be compressed and sintered to form useful shapes.

FILLED GRADES

PTFE’s mechanical properties can be enhanced by adding fillers such as glass fibers, carbon, graphite, molybdenum disulphide, and bronze. Generally, filled PTFE’s maintain their excellent chemical and high temperature characteristics, while fillers improve mechanical strength, stability, and wear resistance.

The properties of 25% glass-filled and 25% carbon-filled PTFE grades are shown below for comparison purposes. There are literally dozens of different filled PTFE products and grades — too many to be listed here. Please contact us for more information about other filled PTFE products for your application.


TYPICAL PROPERTIES of PTFE

ASTM or UL test

Property

PTFE
(unfilled)

PTFE
(25% glass filled)

PTFE
(25% carbon filled)

PHYSICAL

D792

Density (lb/in³)
(g/cm³)

0.078
2.16

0.081
2.25

0.075
2.08

D570

Water Absorption, 24 hrs (%)

< 0.01

0.02

0.05

MECHANICAL

D638

Tensile Strength (psi)

3,900

2,100

1,900

D638

Tensile Modulus (psi)

80,000

D638

Tensile Elongation at Break (%)

300

270

75

D790

Flexural Strength (psi)

No break

1,950

2,300

D790

Flexural Modulus (psi)

72,000

190,000

160,000

D695

Compressive Strength (psi)

3,500

1,000

1,700

D695

Compressive Modulus (psi)

70,000

110,000

87,000

D785

Hardness, Shore D

D50

D60

D62

D256

IZOD Notched Impact (ft-lb/in)

3.5

THERMAL

D696

Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)

7.5

6.4

6.0

D648

Heat Deflection Temp (°F / °C)
at 264 psi

132 / 55

150 / 65

150 / 65

D3418

Melting Temp (°F / °C)

635 / 335

635 / 335

635 / 335

Max Operating Temp (°F / °C)

500 / 260

500 / 260

500 / 260

C177

Thermal Conductivity
(BTU-in/ft²-hr-°F)
(x 10-4 cal/cm-sec-°C)

1.70
5.86

3.1
10.6

4.5
15.5

UL94

Flammability Rating

V-O

V-O

V-O

ELECTRICAL

D149

Dielectric Strength (V/mil) short time, 1/8″ thick

285

D150

Dielectric Constant at 1 MHz

2.1

2.4

D150

Dissipation Factor at 1 MHz

< 0.0002

0.05

D257

Volume Resistivity (ohm-cm)at 50% RH

> 1018

> 1015

104

NOTE: The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers’ complete material property datasheets.
All values at 73°F (23°C) unless otherwise noted.

TEFLON ® is a registered trademark of DuPont

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S1012-M

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Features

  • Symmetrical, single acting piston/rod seal, combined with pressure ring and support ring.
  • By adjusting the number of packings friction and leakage characteristics can be influenced.
  • Excellent static and dynamic sealing performance.
  • Excellent performance in high pressure conditions.
  • Useable for short and long stroke lengths.
  • High wear resistance.

Application

Reciprocating pistons/rods in hydraulic cylinders, plungers etc.

Used in heavy duty applications (presses) with return stroke by equipment weight. Max. pressure 500 bar, max. speed 0.5 m/s.

Installation

Installation normally in open housings.

At closed housings the parts need to be split. In this case the seal must be done  slightly larger (approx. 1% in diameter)