Viton™ Fluoroelastomers for Food and Pharma

Viton™ Fluoroelastomers for Pharma, Food, and Beverage Applications

 

Viton™ fluoroelastomers are high-performance fluoroelastomers from Chemours that offer outstanding durability, flexibility, and resistance for various applications and industries. 

Viton™ fluoroelastomers are excellent for use in food and pharma applications. While EPDM and silicones are often used in such applications, EPDMs have a low resistance to cleaning fluids and silicones exhibit relatively poor steam resistance. Viton™ APA polymers combine superior resistance to steam, commercial cleaning fluids, and many other chemicals. 
 

Viton™ GF-600S and Viton™ Extreme™ ETP-600S are two specialty Viton™ grades manufactured with Advanced Polymer Architecture (APA) that provide a new level of performance. 
 

They provide superior performance in applications where FDA repeat use for food contact compliance is required. This includes seals and gaskets for pharmaceutical, food, and beverage applications. Viton™ GF-600S and Extreme™ ETP-600S offer outstanding resistance to cleaning fluids, sterilization steam, and process chemicals compared to other sealing materials.

Viton™ GF-600S is a high fluorine, peroxide-cured fluoroelastomer that offers superior steam resistance, excellent compression set, and outstanding tolerance to cleaning fluids and chemicals. It provides a superior performance in comparison to traditional FKMs and bisphenol-cured dipolymers.

Viton™ GF-600S is FDA compliant with limitations for repeat-use applications as outlined in Food Contact Notification (FCN) 510.

Viton™ Extreme™ ETP-600S is an outstanding fluoroelastomer that offers excellent resistance to hydrocarbons, acids, bases, alcohols, ketones, esters, and many other solvents. Parts made with Extreme™ ETP-600S are also highly resistant to steam and extreme process conditions.

Viton™ Extreme™ ETP-600S is FDA compliant with limitations for repeat-use applications as outlined in Food Contact Notification (FCN) 53.

Steam Resistance


Viton™ fluoroelastomers made with APA technology vs. Viton™ A-401C (FKM) and other elastomers—% of original tensile strength* in 80 psi steam (156 °C [313 °F]) after 672 hours:
 

 

Bisphenol-cured Viton™ are known for their excellent steam resistance. However, as shown in the graph, vulcanizates based on Viton™ GF-600S and Viton™ Extreme™ ETP-600S provide an even better resistance to property loss in steam.

Viton™ polymers based on APA technology provide excellent retention of tensile properties in steam aging, while the vulcanizate's strength made with silicone drops off to nearly zero in less than 400 hours.

 

Fluids Resistance


Viton™ GF-600S and Viton™ Extreme™ ETP-600S demonstrate improved resistance to cleaning fluids, such as Chematic® 91, Chematic® 9301, and CIP 220® in comparison to bisphenol cure dipolymer FKM, and EPDM:
 

 

Viton™ GF-600S and Viton™ Extreme™ ETP-600S exhibit lower volume loss or swell in various cleaning fluids. They maintain their sealing performance, hardness, and tensile strength under pressure.
 


 

The results show that after aging in various commercial cleaning fluids, compounds based on Viton™ GF-600S and Viton™ Extreme™ ETP-600S show low to no changes in tensile strength. In contrast, Silicone vulcanizates demonstrate a more significant tensile strength loss after 1,008 hours of aging.

Percent change in volume after 336 hours at 23°C (73°F) of fluid aging:

 
  Viton™
A-401C
Viton™
GF-600S
Viton™
ETP-600S
EPDM Silicone
Ethanol (100%) 5.0 1.1 0.4 1.0 8.0
Acetic acid (20% Glacial/80% H2O) 24.8 0.5 0.8 9.7 –1.5
Carvacro 2.5 0.7 0.2 –2.8 6.5
Carvyl acetate 28.3 2.5 1.1 0.8 13.7
Cinnamyl alcoho 4.3 1.6 1.1 0.9 5.3
Citral (terpene) 44.4 3.6 1.0
Decyl acetate 29.4 3.3 1.4 5.6 18.4
2,4-Dimethoxybenzaldehyde 18.0 2.2 0.5 –0.6 5.4
Dodecanal 2.0 2.3 1.5 3.0 11.5
Ethyl benzoate 36.9 5.2 2.8 3.0 12.0
Ethyl 2-benzylacetoacetate 44.6 3.0 0.9 0.3 7.3
Ionone 51.0 2.5 0.8 2.0 12.3
Isobutylphenylacetate 26.9 2.7 1.0 1.2 11.1
Isophorone 90.0 7.2 1.0 1.3 9.9
2-Ketobutryic acid 26.1 2.5 2.3 17.4 3.8
d-Limonene 4.3 1.9 0.9 16.5 25.7
Methyl anisole 22.0 4.7 2.5 4.7 15.1
Nerolidol 4.2 2.2 1.6 –0.2 10.8
2-Undecanone 45.1 4.4 2.0 1.7 16.2
 
Weight change percent after one week at 23°C (73°F) in soft drink flavoring concentrates:
 


 
Viton™ GF-600S and Viton™ Extreme™ ETP-600S exhibit very low extractable as they do not require the use of metal acid acceptors such as magnesium and calcium hydroxide:
 
 
 
Viton™ GF-600S and Extreme™ ETP-600S show lower levels of extractable carbon compounds than EPDM and platinum-cured silicones:
 
 

Compared to typical sealing materials, such as EPDM and Silicones, Viton™ GF-600S and Viton™ Extreme™ ETP-600S provide an outstanding combination of:

  • Resistance to steam and caustic cleaning fluids vs. bisphenol-cured FKM
  • Steam resistance compared to silicone
  • Resistance to caustic and acid cleaning fluids vs. EPDM

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