Sealing Shielding

What O-Rings Do You Recommend for an E85 Rated Assembly?

Seals for E85 rated assembliesWith the desire for renewable energy sources, coupled with dependence on foreign oil, Americans are becoming increasingly interested in alcohol/fuel blends.

There are nearly 20 million flex fuel vehicles on U.S. roads today, and over 2,900 ethanol fuel stations. With the increased use of alcohol/fuel blends there is also an increased demand for seals that are compatible with alcohol/fuel blends. Parker offers a variety of compounds to meet this crucial need in the automotive industry.

The combination of alcohol and fuel creates a significant conundrum from a sealing standpoint, as you need a compound that is compatible with both alcohol and fuel. For conventional gasoline, we typically recommend A-type fluorocarbon, or GLT-type fluorocarbon if you need to seal down to -40˚F (-40˚C). These perform extremely well in gasoline, but in alcohol, they can swell to more than twice their original size, as shown in Figure 1.

What O-Rings do you recommend for an E85 rated assembly?

To solve this issue, Parker offers a number of specialized grades of fluorocarbon, which are also compatible with alcohol/fuel blends. Of these, one of our most cost-effective options is V1263-75. It is an F-type fluorocarbon with a temperature rating of -15˚F to 400˚F (-26˚C to 204˚C).

F-type fluorocarbon seal

When colder temperatures are desired, Parker also offers V1163-75, which is a GFLT-type fluorocarbon, which has a temperature range of -35˚F to 400˚F (-37˚C to 204˚C).

GFLT-type fluorocarbon seal

While the minimum temperature of -35˚F (-37˚C) is a dramatic improvement, there are several automotive applications where a minimum temperature of -40˚F (-40˚C) or colder is desired. For these applications, we offer compound VG286-80, which has a temperature range of -50˚F to 400˚F (-46˚C to 204˚C). We also offer V1289-75. It has a temperature range of -55˚F to 400˚F (-48˚C to 204˚C), and offers superior performance in alcohols.

Type 3 fluorocarbon seals

Compounds V1163-75 and V1263-75 will continue to be the low cost solutions for sealing flex fuel. In fact, these materials have been used successfully in ongoing multi-year customer field trials without fuel leakage. However, Parker’s low temperature (Type 3) fluorocarbon compounds VG286-80 and V1289-75 offer an additional safety factor for low temperature function.

For more information, visit the Parker O-Ring & Engineered Seals Division and speak online with our experienced applications engineers

 

David Mahlbacher, applications engineer

 

 

This article was contributed by David Mahlbacher, applications engineer, O-Ring & Engineered Seals Division.

 

 

 

 

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