S101 is a rusty-orange Methyl Silicone Rubber, commonly refered as Silicone. S101 is an elastomer which remains flexible at very low temperatures and can withstand continuous heating at 392°F (200°C) without hardening, making S101 suitable for high and low temperature applications. Silicone rubbers have poor mechanical properties and abrasion resistance, therefore they are mainly used for static sealing applications and are not recomended for dynamic applications.
S101 also has excellent weatering, ozone and aging properties. Silicones are highly permeable to gases, and are generally not recomended for exposure to ketones, concentrated acids, or steam. Silicone swells considerably in aliphatic and aromatic hydrocarbon fluids, therefor it should be cosidered non-resistant to petroleum oils, also it can be used in high aniline point oils.
Temperature Range: -78°F to 392°F (-60°C to 200°C)

E101 is a black Ethylene Dien Propylene Rubber, commonly refered as EPDM. It is used in hot water or steam applications, glycol-based brake fluids, alkalies as well as in fire resitant fluids (HFC) and some Phosphate Esters. E101 is also used in bases, acids, and alcohols. E101 is not resitant to mineral oil based fluids, diester based lubricants or aromatic fuels as well as vegetable and animal oils. E101 is used for standard and special sealing applications as hydraulic or rotary seal, O-rings, flange seals and gaskets up to 302°F (150°C).
Temperature Range: -40°F to 302°F (-40°C to 150°C)