These oil seals are created from a low-temperature tolerant compound.  Benefits include: 

Oil seal: get to know all the details about this timing chain kit component

NBR rubber is above all resistant to oils, especially hydraulic oils, lubricants, petrol and other aliphatic hydrocarbons, diluted acids and lyes. Good physical values such as high friction resistance and ruggedness and good temperature resistance (-25 °C up to +120 °C, in part to -40 °C) give this natural rubber a wide range of uses.

Type:HTB59YR oil seal/NBR oil seal/differential gear Oil Seal

This tough, chemically inert polymer has a wide working scope as well as: 

Rubber gaskets are essential components in many industrial applications, providing a reliable seal between two mating surfaces to prevent leaks or contamination. One common type of rubber gasket is the 40mm rubber gasket, which is used in a variety of industries for different applications.

Updates in oil seals

ERIKS also supplies the types GR and GRST. These are virtually identical to the types R and RST, except in this case the metal inner ring is also completely encased in rubber. ERIKS uses FKM rubber here as standard, so these seals are ideal for use in acidic environments.

O-rings are the most commonly used seals as they provide incredible value – very affordable, versatile, and efficient. They are made with several elastomer materials as to the application they will be used for, so it’s important that you know the materials an o-ring is made of before purchase.