Material detail – Viton Rubber
Viton is a brand of synthetic rubber and fluoropolymer elastomer commonly used in O-rings, chemical-resistant gloves, and other moulded or extruded goods. The name is a registered trademark of The Chemours Company.
Viton is a flourine-based synthetic rubber, with it’s flourine content most commonly between 66%-70%. Commonly distinguished from other types of synthetic rubber by it’s green.or brown colour.
Viton has a very high density,1,800 kg/m3, whereas other rubbers typically measure around 1,010-1,520kg/m3 ¹
Viton polymers come in 4 varieties:
- A (dipolymers of VF2/HFP): general-purpose sealing, automotive and aerospace fuels and lubricants. Nominal polymer fluorine content: 66%.
- B (terpolymers of VF2/HFP/TFE): chemical process plant, power-utility seals and gaskets. Nominal polymer fluorine content: 68%.
- F (terpolymers of VF2/HFP/TFE): oxygenated automotive fuels, concentrated aqueous inorganic acids, water, steam. Nominal polymer fluorine content: 70%.
- Specialty types include GLT, GBLT, GFLT & Viton Extreme (copolymers of TFE/propylene and ethylene/TFE/PMVE): automotive, oil exploration, special sealing and ultra-harsh.
The performance of fluoroelastomers in aggressive chemicals depends on the nature of the base polymer and the compounding ingredients used for molding the final products (e.g. O-rings). This performance can vary significantly when end-users purchase Viton polymer containing rubber goods from different sources. Viton is generally compatible with hydrocarbons, but is incompatible with ketones such as acetone, acetates and organic acids such as acetic acid.
When used as a material for producing O-rings Viton is particularly useful for hoses and other channels that carry fuels and it is resistant to many gases such as nitrox or simple oxygen.
At high temperatures or in a fire, fluoroelastomers decompose and may release hydrogen fluoride. Any residue must be handled using protective equipment.
Properties ²
| Property | Value |
| Durometer, Shore A | 75+/- 5 |
| Tensile, psi (MPa), Minimum | 1450 (10) |
| Elongation, % Minimum | 150 |
| Specific Gravity | – |
| HEAT AGE, 70 HRS @ 250 C | |
| Durometer Change, Points | +10 |
| Tensile Strength Change, % Maximum | -25 |
| Elongation Change, % Maximum | -25 |
| COMPRESSION SET, 22 HRS @ 200 C | |
| Original Deflection, % Maximum | 15 |
| RESISTANCE TO OZONE | |
| ASTM D1171, Method B | No Cracks |
| RESISTANCE TO OUTDOOR AGING | |
| ASTM D1171 | No Cracks |
| FUEL AGE, 70 HRS @23C in Reference Fuel C | |
| Durometer Change, Points | +/-5 |
| Tensile Change, % Maximum | -25 |
| Elongation Change, % Maximum | -20 |
| Volume Change, % | 0/+10 |
| FLUID RESISTANCE, 70 HRS @200C in | |
| Stauffer 7700/SAE Fluid No. 2 | |
| Durometer Change, Points | -15/+5 |
| Tensile Change, % Maximum | -40 |
| Elongation Change, % Maximum | -20 |
| Volume Change, % Maximum | +25 |
| LOW TEMPERATURE BRITTLENESS | |
| ASTM D2137, Method A, 9.3.2 | |
| 3 Minutes @ -25 C | Non-Brittle |
Specifications Met: ASTM D2000-01 Grade M6HK810 A1-10 B38 C12 C20 EF31 EO88 F15
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