PTFE Materials

INERTEX® SQ-S GASKET SHEETS (download PDF)

INERTEX® SQ-S Gasket Sheet is the world's first 100% Expanded PTFE sheet in a true 60"x60" format, and now is also available in 77"x77" size (SQ-S "H" Huge Sheet.) Independent laboratory tests have revealed that SQ-S is one of the tightest gasket materials available to the market.

The INERTEX® SQ-S "V" Rigid Gasket Sheet brings an improved rigidity to the SQ-S Gasket Sheet while maintaining the excellent sealing characteristics of SQ-S. It is designed for difficult installation conditions when rigidity is an important factor.
The INERTEX® family of gasket sheets are produced by a proprietary expansion process which generates a highly fibrillated microstructure with nearly equal tensile strength in every direction (ISOTROPIC.) This unique structure maximizes performance predictability and stability while minimizing creep and cold flow. Whatever your application, INERTEX® SQ-S Sheet Gasketing is setting the new standard in providing the user with the tightest, most leak-free gasket possible.

Product Benefits:
• Strong and tough, capable of withstanding 40,000 psi stress without affecting seal ability
• One of the tightest gasket materials in the world. An ultimate solution to the EPA issues
• Unlimited shelf time. No aging, and unaffected by UV, ozone and corona
• Easily hand or die cut. Easily removable from flange surfaces after use
• Largest expanded PTFE sheets in the world (SQ-S "H",) suitable for large diameter flanges w/out segmenting & improving yield of gasket cutting
• Engineered to replace all filled PTFE sheets in various colors reducing gasket inventories
• Far exceeding the requirements of SEMASPEC 92010934B-STD for semiconductor uses
• Excellent choice for handling ultra-pure water for biotech and pharmaceutical industry
• Soft and compressible, suitable for FRP, porcelain, plastic and glass-lined piping vessels


VIRGIN PTFE DATASHEET (download PDF)

Properties

Method

Unit

Typical Values (from-to)

Specific gravity

ASTM D792

-

2,14 - 2,20

Tensile strength

ASTM D1457

N/mm2

20 - 35

Elongation at break

ASTM D1457

%

210 - 400

Compressive strength 1% deformation

ASTM D695

N/mm2

4,00 - 4,50

Deformation under load 14 N/mm2 for 24hrs

ASTM D621(1)

%

10 - 15

Flexural strength 0,7 N/mm2

ASTM D790

N/mm2

no break

Impact strength (Izod) 57°C

ASTM D256

J/cm

1,10

Impact strength (Izod) 23°C

ASTM D256

J/cm

1,60

Impact strength (Izod) 77°C

ASTM D256

J/cm

3,30

Hardness

ASTM D2240

(shoreD)

50 - 60

Friction coefficient - static

ASTM D3028 (2)

-

0,09

Friction coefficient - dynamic

ASTM D3028 (2)

-

0,05

PTFE - steel oil lubricated

-

-

0,02 - 0,06

Working temperature range

-

°C

-200 - +260

Increase in volume from room temperature to molten state (340°C)

-

%

27 - 28

Coefficient of thermal expansion from 25 to 100°C

ASTM E831

°C-1

16 x 1-5

Thermal conductivity

ASTM D2214

W/mK

0,20

Specific heat 0°C

-

KJ/kg.K

0,96

Specific heat 50°C

-

KJ/kg.K

1,05

Temperature of distortion 0,46 N/mm2

ASTM D648

°C

130 - 140

Temperature of distortion 1,85 N/mm2

ASTM D648

°C

50 - 60

Dielectric strength (short-time air thickness 0,5 mm)

ASTM D149

kV/mm

55

Dielectric constant

ASTM D150

-

2,10

Dissipation factor

ASTM D150

-

<0,0002

Volume resistivity

ASTM D257

Ohm/cm

10-17

Surface resistivity

ASTM D257

Ohm

10-15

Arc-resistance

ASTM D495

sec

OK (4)

Water absorption

ASTM D570

%

<0,01

Flammability ATB

ASTM D635

sec

<5,00

Flammability AEB

ASTM D635

mm

<5,00

Note:
All the values refer to the temperature of 23°C unless otherwise specified
(1) Superseded standard
(2) Speed 5 m/min; load 1kg/cm2, sliding surface steel roughness Ra = 0,4 " 0,6 micron
(3) 100% relative humidity
(4) Without defects