Home >> Seal >> Trelleborg Sealing Solution >> Turcon® Variseal® >> Choosing the Right Seal for your Application
Choosing the Right Seal for your Application
Turcon® Variseal® offers major benefits in the design of components such as cylinders. These include:
- Excellent leakage control
- High resistance to wear
- High resistance to extrusion into gaps
- Withstanding aggressive and abrasive process media
- Very good temperature capabilities
- Low friction
- Compact form
Turcon® Variseal® is available in a range of geometries and designs that allow the optimum profile to be selected for each application. They can be produced from a wide range of Turcon® materials, our proprietary PTFE-based compounds. These are specially formulated for sealing elements and offer superior characteristics specifically matched to the demands of our customers.
When required, Variseal® can also be manufactured from Zurcon® Z80, our UHMWPE-based material, or Zurcon® Z48, our Thermoplastic Elastomer material.
To choose the best Turcon® Variseal® for your application, you must first decide the functional parameters. Table 1, Table 2 and Table 3 can then be used to make an initial selection of seals and materials. These tables give details of where further details can be found in the catalogue.
It is also important to consider the quality of the mating surface, which has a significant effect on the function and service life of the sealing system.
If help is required when specifying a seal then contact your local Daemar Technical Sales Representative.
Table 1: Turcon® Variseal® Selection Table
| Seal Type | Type of Application | Technical Data | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Static | Reciprocating | Rotary | Maximum Pressure | Working Temp. | Maximum Speed | ||||
| Dynamic MPa (bar, psi) |
Static MPa (bar, psi) |
°C / (°F) | Reciprocating m/s (fpm) |
Rotating m/s (fpm) |
|||||
M2 |
C | A | B | 20 (200, 2900) | 40 (400, 5800) | -70 to +300 (-94 to +572) | 15 (2940) | 1.27 (250) | |
M2S |
C | A | C | 20 (200, 2900) | 40 (400, 5800) | -70 to +300 (-94 to +572) | 15 (2940) | 1.27 (250) | |
W2 |
C | A | B | 20 (200, 2900) | 40 (400, 5800) | -70 to +300 (-94 to +572) | 15 (2940) | 1.27 (250) | |
H  |
A | B | C | 20 (200, 2900) | 40 (400, 5800) | -100 to +200 (-148 to +392) | 5 (985) | 0.10 (18) | |
HF |
A | – | C | n/a | 60 (600, 8702) | -150 to +200 (-238 to +392) | n/a | n/a | |
Roto |
B | B | A | 20 (200, 2900) | 25 (250, 3626) | -70 to +300 (-94 to +572) | 15 (2940) | 2.00 (360) | |
Properties: A Excellent B Good C Satisfactory
Table 2: Application Guide
| Contact Media or Operating Conditions | Static or Slightly Dynamic | Reciprocating | Rotating |
| Air, Gas | Turcon ® T05 | Turcon ® T24 | Turcon ® T24 |
| Water, Steam | Turcon ® T05 | Turcon ® T40 | Turcon ® T40 |
| Oil, Crude oil | Turcon ® T05 | Turcon ® T40 | Turcon ® T40 |
| General chemical | Turcon ® T05 | Turcon ® T40 | Turcon ® T40 |
| Petrochemicals | Turcon ® T05 | Turcon ® T40 | Turcon ® T40 |
| Food, Drugs | Turcon ® MF1 | Zurcon ® Z80 1) | Turcon ® MF6 |
| Vacuum | Turcon ® T01 | Turcon ® T05 | Turcon ® T05 |
1) Maximum operating temperature +80 °C (+176 °F). In a pressure-free state, sterilization is possible for a short period at a higher temperature.
Table 3: Turcon® & Zurcon® Material Selection Guide
| Material Code | Material Description | Temperature Range °C (°F) | Chemical Compatibility | Radiation Resistance |
| T01 / MF1* | Premium grade virgin PTFE for static, slow dynamic or light duty applications. MF1 for food contact service. Color: white | -253 to +260 (-423 to +500) | A | 7 x 102 Gray (7 x 104 Rads) |
| T05 | Premium grade modified PTFE. Light duty material with greater wear resistance than Turcon T01. Reciprocating and slow rotary applications. Color: turquoise | -200 to +260 (-328 to +500) | A | 7 x 102 Gray (7 x 104 Rads) |
| T07 | Proprietary polymer-reinforced compound for long wear life in challenging combinations of pressure and temperature. Color: black | -60 to +300 (-76 to +572) | A | 7 x 102 Gray (7 x 104 Rads) |
| T12 | Use where poor lubrication is a problem, good performance in valve applications. Color: black | -60 to +300 (-76 to +572) | A | 7 x 102 Gray (7 x 104 Rads) |
| T24 | High-grade formulation of virgin PTFE-based material compounded with carbon additive. Recommended for dynamic applications, in particular dry-running air and gas). Color: black | -60 to +300 (-76 to +572) | A | 7 x 102 Gray (7 x 104 Rads) |
| T25 | High-grade formulation of virgin PTFE-based material compounded with glass fibers and lubricant additives. Excellent wear and low friction characteristics for lubricated rotary applications. Color: black / gray | -60 to +300 (-76 to +572) | A | 7 x 102 Gray (7 x 104 Rads) |
| T40 / MF4* | High-grade formulation of virgin PTFE-based material compounded with carbon fiber additive. Excellent wear and low friction characteristics. Suited to reciprocating and rotary applications. Suitable for use in media with poor lubricating properties and for dry-running situations. MF4 is a specialized grade of Turcon T40 compound for food contact service. Color: black / gray | -60 to +300 (-76 to +572) | A | 7 x 102 Gray (7 x 104 Rads) |
| M79 | High grade formulation of virgin PTFE-based material compounded with an aromatic polymer and lubricant. Especially suited for low pressure rotary applications and running against soft surfaces. Color: black / gray | -100 to +300 (-148 to +572) | A | 7 x 102 Gray (7 x 104 Rads) |
| MF6* | High grade formulation of virgin PTFE-based material compounded with an aromatic polymer. Especially suited for low pressure rotary applications and running against soft surfaces. MF6 is for food contact service. Color: beige | -60 to +260 (-76 to +500) | A | 7 x 102 Gray (7 x 104 Rads) |
| Z48 | TPE (Thermoplastic Elastomer) for tight sealing with long wear life in applications without high temperatures or corrosive chemicals. Color: black | -62 to +135 (-80 to +275) | C | 1.5 x 105 Gray (1.5 x 107 Rads) |
| Z80 | UHMWPE. Excellent wear and abrasion resistance. Very good lubricity in water based media. Color: translucent white | -253 to +80 (-423 to +176) | B | 1 x 105 Gray (1 x 107 Rads) |
For temperatures above 260 °C (500 °F), please reference the Plastics Industry Association Safe Handling Guide.
* MF grade materials have compliance to FDA, EU and Chinese GB standards. Contact your local Customer Solution Center for detailed compliance information.
