High-temperature sealing
FKM is often evaluated for high-temperature static and dynamic seals where the service profile exceeds the normal operating range of general-purpose elastomers.
FKM (Viton) compound
Industrial fluoroelastomer rubber
A technical reference for Hamta Polymer FKM compounds, commonly referred to as Viton, from 50 to 90 Shore A. This material family is assessed where elevated temperature and demanding fluid exposure are central to the design. Final selection requires review of the exact medium, temperature, pressure and service cycle.
-20 to +230 C
Typical service temperature
6
Standard hardness grades
ASTM / ISO
Test references
50-90 Shore A
Hardness range
Fluid compatibility is specific
Oil, fuel and chemical resistance depend on the FKM type and the exact medium. Compatibility must be assessed by concentration, temperature and exposure cycle.
Trade-offs matter
Specific gravity, low-temperature flexibility, compression set and process conditions should be reviewed together with the finished-part geometry.
Hamta Polymer FKM (Viton) general specifications
Chemical nameFluoroelastomer
Standard designationFKM (ASTM D1418); Viton is a commonly used commercial name
Available hardness range50 to 90 Shore A
Typical continuous service range-20 to +230 C, depending on compound and application
Reference test standardsASTM and ISO methods stated in the datasheet
ColourBlack; other colours subject to agreement
Specific gravity1.82 to 1.96 g/cm3, depending on formulation and hardness
Technical datasheet
FKM (Viton) datasheet by hardness
Choose a hardness grade to view the recorded mechanical properties, units and test references.
| Property | Symbol | Unit | Value | Standard |
|---|---|---|---|---|
| Hardness | H | Shore A | 75 +/- 5 | ASTM D2240 / ISO 7619 |
| Tensile strength | TS | MPa | >= 15.0 | ASTM D412 / ISO 37 |
| Elongation at break | EB | % | >= 180 | ASTM D412 / ISO 37 |
| 100% modulus | M100 | MPa | 4.0-8.0 | ASTM D412 / ISO 37 |
| Tear resistance | TR | kN/m | >= 30 | ASTM D624 / ISO 34 |
| Compression set (200 C / 70 h) | CS | % | 14-24 | ASTM D395-B / ISO 815 |
| Resilience | R | % | 32-42 | ISO 4662 |
| Specific gravity | rho | g/cm3 | 1.90 +/- 0.04 | ASTM D792 / ISO 2781 |
| Abrasion resistance | Abr | mm3 | <= 145 | ISO 4649 |
| Oil volume change (IRM 903, 100 C / 70 h) | AV | % | <= 3.5 | ISO 1817 |
| Typical service temperature | T | C | -20 to +220 | - |
FKM (Viton) chemical-resistance guidance
This is an orientation aid, not a final compatibility approval. Confirm the specific medium, concentration, temperature and exposure cycle with the technical team.
Petroleum oils and fuels
Mineral oils and petroleum-based hydraulic fluidsExcellent
Hydrocarbon fuels under reviewed service conditionsExcellent
Heat and weather exposure
High-temperature dry-air and heat-ageing dutiesExcellent
Ozone and general weatheringExcellent
Selected chemicals
Selected acids and chemicals subject to exact-medium reviewGood
Hot water and low-pressure steam subject to compound reviewFair
Unsuitable media without specialist review
Ketones, acetone and MEKPoor
High-temperature deionised water and steamPoor
Excellent
Good
Fair
Poor
Technical notes and limitations
1
Values are typical laboratory guidance for the stated methods. Finished-part results can vary with formulation, cure, geometry and production conditions.
2
FKM is a material-family designation. The trade name Viton is retained as a familiar shared market term but does not replace a compound-specific technical review.
3
Compression set values shown at 200 C are not a universal seal-life prediction. Validate the actual sealing load, thermal cycle and medium.
4
For temperatures above the stated range or exceptionally aggressive media, consult the technical team about the required elastomer family and compound formulation.
Where is FKM (Viton) considered in our product range?
These product families can be explored from the English product hub. Suitability is determined by the final application, not by the material code alone.
Need help selecting an FKM grade?
Share the medium, temperature range, pressure, motion, dimensions and target quantity with Hamta Polymer for an application-specific discussion.