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FAQs

The purpose of this section is to respond to frequently asked questions regarding Dyneon™ Fluoropolymers. If we do not address your question here, or you would like additional information, please Contact Us.

Fluoroelastomer FAQs - Questions

Does Dyneon sell rubber parts?

What is the difference between fluoroelastomers and other types of elastomers such as nitrile or silicone?

Does Dyneon sell fluoroelastomers that meet the SAE AMS specifications?

How do I know when to use a high fluorine content fluoroelastomer?

When should I consider Dyneon™ Base Resistant Elastomers?

What is the difference between an incorporated cure fluoroelastomer and raw gum?

What is the difference between FE and FC grade Dyneon™ fluoroelastomers?

Does Dyneon sell fluoroelastomer compounds?

Does Dyneon sell masterbatch curatives?

What is the durometer (hardness) range of fluoroelastomer compounds?

What is the temperature range of fluoroelastomers?

What is the shrinkage rate for fluoroelastomers?

Can Dyneon™ Fluoroelastomers be bonded to other elastomers?

How long is a typical post cure?


Answers

Does Dyneon sell rubber parts?

No, Dyneon is a fluoropolymer raw material supplier. We manufacture fluoroelastomer gums and compounds in a variety of molecular weights, which are available with or without specialty curatives.

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What is the difference between fluoroelastomers and other types of elastomers such as nitrile or silicone?

The primary difference is that fluoroelastomers offer better chemical resistance to a broader range of chemicals. They also provide better long-term heat resistance. If your application has an operating temperature between 150°C to 230°C (302°F to 446°F), you should consider a fluoroelastomer.

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Does Dyneon sell fluoroelastomers that meet the SAE AMS specifications?

Yes, please see our Aerospace Industry Update (PDF, 33K) regarding technical specifications approved for fluoroelastomer o-rings, compression seals, molded parts and sheet goods.

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How do I know when to use a high fluorine content fluoroelastomer?

Generally, the higher the fluorine content of a fluoroelastomer, the better the chemical resistance and fuel permeation resistance. This resistance results in lower swelling, less softening and in turn generally better durability for a longer part of life.

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When should I consider Dyneon™ Base Resistant Elastomers?

Dyneon™ Base Resistant Elastomers (BREs) offer outstanding base resistance (as the name suggests). Consider using Dyneon BREs when your application calls for exposure to a basic environment such as engine oil reference fluid (service fluid 105), transmission fluid and axle lubes. Dyneon BRE's offer the benefit of resistance to hardening of the part surface which can lead to surface crazing, cracking and eventually part failure.

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What is the difference between an incorporated cure fluoroelastomer and raw gum?

A "raw gum" is the base polymer alone without the curative package. Incorporated cure fluoroelastomers are base polymers that include (i.e. you don't have to add) the curative package.

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What is the difference between FE and FC grade Dyneon™ fluoroelastomers?

The proprietary cure system found in Dyneon™ FE grade fluoroelastomer provides improved scorch safety over our FC grade fluoroelastomer, allowing for higher molding temperatures and faster cure cycles. It is recommended that FE grades be used whenever possible for the cleanest running, most efficient molding processes.

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Does Dyneon sell fluoroelastomer compounds?

No. we manufacture and sell fluoroelastomers, which are the base polymers that go into a fluoroelastomer compound. For information about locating a compounder in your area, please .

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Does Dyneon sell masterbatch curatives?

Yes, we sell a selection of curative masterbatches. Please Contact Us for more information.

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What is the durometer (hardness) range of fluoroelastomer compounds?

The durometer range is 45 to 90 for standard dipolymers and terpolymers.

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What is the temperature range of fluoroelastomers?

Fluoroelastomers (FKMs) can generally be used in environments ranging from -40°C to 225°C (-40°F to 437°F).

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What is the shrinkage rate for fluoroelastomers?

By shrinkage we are referring to the volume loss after cure. This rate varies from polymer to polymer but is roughly between 1.5 and 3%. Please contact Dyneon for specific shrinkage information.

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Can Dyneon™ Fluoroelastomers be bonded to other elastomers?

Yes, Dyneon has developed expertise in bonding fluoroelastomers not only to other elastomers but also to a variety of metals and plastics. Please Contact Us for bonding information.

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How long is a typical post cure?

Post cure ranges from 4 to 16 hours at 200°C to 250°C (392°F to 482°F) are typical; however, this can be optimized depending on what physical properties are required. Please contact Dyneon for post cure information.

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