bearing oil seal CR 19229 : 

Descriptions of oil seals/shaft seals/double lip seals 

Oil Seals: Designed to aid trouble-free operation of your equipment, providing an excellent barrier against the escape of oils and greases and preventing the ingress of foreign matter. 
Benefits: Excellent wear resistance, good running properties, high resistance to chemicals and petroleum based fuels including petrol, diesel and LPG.

Resistance to temperature extremes:  

Heat 

Viton® withstands high temperature and simultaneously retains its good mechanical properties better than most other elastomers. Oil and chemical resistance also are relatively unaffected by elevated temperatures. Compounds of Viton® remain usefully elastic indefinitely when exposed to laboratory air oven aging up to 204°C (400°F) or to intermittent test exposures up to 260°C (500°F). High temperature service limits are generally considered to be:

3,000 hr. at 232°C (450°F)
1,000 hr. at 260°C (500°F)
240 hr. at 288°C (550°F)
48 hr. at 316°C (600°F)

Cold 

1.Viton is generally serviceable in dynamic applications down to -18° to -23°C (0° to -10°F), although special formulations permit its use in static applications down to -54°C (-65°F). Also, Viton® has proven to be satisfactory for static seals used under conditions approaching absolute zero.

2. Resistance to degradation by a greater variety of fluids and chemicals than any non-fluorinated elastomer, providing the best proven fluid resistance of any commercial rubber. Excellent resistance to oils, fuels, lubricants, and most mineral acids.

3. Extremely low permeability to a broad range of substances, including particularly good performance in oxygenated automotive fuels.

4. Resistance to many aliphatic and aromatic hydrocarbon fluids that act as solvents for other rubbers.

5. Exceptionally good resistance to compression set, even at temperatures which can embrittle other non-fluorinated elastomers.

6. Exceptionally good resistance to atmospheric oxidation, sun, and weather. Excellent resistance to fungus and mold.

7. Good electrical properties in low voltage, low frequency applications.

8. Low burning characteristics; inherently more resistant to burning than other non-fluorinated hydrocarbon rubbers.