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Aflas® vs Silicone for O-Rings and Seals

Aflas® (TFE/P, FEPM)

Silicone (VMQ, SIL)

Description
 Both materials are well suited for use in the -10 to 205°C range. Silicone has an advantage in lower temperatures and Silicone has an advantage in higher temperatures. Marco offers specific compound formulations extending these ranges even futher as can be seen in the following compound comparison chart. When comparing these materials with respect to electrical current resistance, Silicone has a slight advantage. The differences in compression set resistence show that Silicone has a significant advantage. Additionally, Silicone has a significant advantage when considering wear resistance. Also, both materials are equally poor when comparing heat stability. Furthermore, Aflas® has a slight advantage when comparing short term resilience. Finally, Aflas® has a significant advantage when evaluating differences in permeation resilience. Both materials are resistant to ozone and brake fluids, with Aflas® having specific resistences to bases, steam, hot amines, solvents, highly reactive organic chemicals, highly reactive inorganic chemicals, Hydrogen Sulfide (H2S), gamma-ray radiation, strong acids, petroleum oils, acetone, amines, ammonia, halogenated hydrocarbons, di-ester lubricants, vacuum, low molecular weight esters, low molecular weight ethers, skydrol fluids, most acids and steam <400ºF. Silicone has specific resistence to compression set, vegetable oils, greases, weathering and sunlight, animal oils, silicone oils, oxygen, fungal growth, ketones, dry heat, wide temperature range, non-toxic and odorless.
Compounds
Marco
Compound
Number		DatasheetHardness
(Shore A)		ColorLow TempHigh TempFeatures
Compound: L1000Datasheet: View DatasheetHardness: 80Color: BlackLow Temp:
15 °F
(-10 °C)
High Temp:
450 °F
(235 °C)
Description: General purpose Aflas ®, steam resistant, sour gas resistant, acid resistance, for chemical and oil industries  (higher performance Alfas® versions avaialble for oil drilling environments)
Compound: L1003Datasheet: View DatasheetHardness: 90Color: BlackLow Temp:
15 °F
(-10 °C)
High Temp:
450 °F
(235 °C)
Description: General purpose Aflas® with a higher durometer. Steam resistant, sour gas resistant, acid resistance, for chemical and oil industries. Good for high pressure applications
Compound: L1009Datasheet: View DatasheetHardness: 90Color: BlackLow Temp:
30 °F
(0 °C)
High Temp:
475 °F
(250 °C)
Description: Higher performance and higher durometer Aflas®, improved explosive decompression resistance, steam resistance, sour gas resistance, acid resistance, tested to Norsok M-710 for oilfield
Compound: L1011Datasheet: View DatasheetHardness: 80Color: BlackLow Temp:
15 °F
(-10 °C)
High Temp:
450 °F
(235 °C)
Description: FDA/USP class VI compliant Aflas® material. Good for a variety of Pharma and Food related applications.
Compound: S1000Datasheet: View DatasheetHardness: 70Color: OrangeLow Temp:
-75 °F
(-60 °C)
High Temp:
400 °F
(205 °C)
Description: General purpose and FDA compliant Silicone per 21 CFR 177.2600   (available in nearly any color and durometer)
Compound: S1001Datasheet: View DatasheetHardness: 70Color: OrangeLow Temp:
-75 °F
(-60 °C)
High Temp:
400 °F
(205 °C)
Description:
Compound: S1004Datasheet: View DatasheetHardness: 40Color: OrangeLow Temp:
-75 °F
(-60 °C)
High Temp:
400 °F
(205 °C)
Description: General purpose softer than standard Silicone to seal rough or warped glands and or low closure force applications
Compound: S1015Datasheet: View DatasheetHardness: 70Color: OrangeLow Temp:
-65 °F
(-55 °C)
High Temp:
600 °F
(320 °C)
Description: Higher temperature resistant Silicone
Compound: S1020Datasheet: View DatasheetHardness: 70Color: Clear-translucentLow Temp:
-65 °F
(-55 °C)
High Temp:
400 °F
(205 °C)
Description: Clear-Translucent and FDA compliant Silicone per 21 CFR 177.2600
Compound: S1032Datasheet: View DatasheetHardness: 70Color: YellowLow Temp:
-75 °F
(-60 °C)
High Temp:
400 °F
(205 °C)
Description:
Compound: S1037Datasheet: View DatasheetHardness: 70Color: Clear-translucentLow Temp:
-65 °F
(-55 °C)
High Temp:
400 °F
(205 °C)
Description: Medical Grade USP Class VI and FDA compliant Silicone, Platinium Cured, Clean Room Manufactured
Compound: S1043Datasheet: View DatasheetHardness: 50Color: OrangeLow Temp:
-105 °F
(-75 °C)
High Temp:
400 °F
(205 °C)
Description: Lower temperature resistant Silicone
Compound: S1081Datasheet: View DatasheetHardness: 65Color: Dark grayLow Temp:
-65 °F
(-55 °C)
High Temp:
350 °F
(180 °C)
Description: EMI RFI Shielding Nickel Coated Graphite filled Silicone, Volume Resistivity 0.10 ohm-cm
Compound: S1083Datasheet: View DatasheetHardness: 70Color: Clear-translucentLow Temp:
-65 °F
(-55 °C)
High Temp:
400 °F
(205 °C)
Description: Medical Grade USP Class VI and FDA compliant Silicone, Platinium Cured, Commercial Manufactured
Compound: S1146Datasheet: View DatasheetHardness: 70Color: WhiteLow Temp:
-75 °F
(-60 °C)
High Temp:
480 °F
(250 °C)
Description: Medical Grade USP Class VI and FDA compliant Silicone, Platinium Cured, Commercial Manufactured
Compound: S1184Datasheet: View DatasheetHardness: 70Color: RedLow Temp:
-75 °F
(-60 °C)
High Temp:
400 °F
(205 °C)
Description:
Compound: S1206Datasheet: View DatasheetHardness: 80Color: Low Temp:
-75 °F
(-60 °C)
High Temp:
400 °F
(205 °C)
Description:
Temperature Range Comparison
Box: Base Material Family Range
Whiskers: Specialty Compounds
General Information
Full Name
Aflas®:
Aflas® (TFE/P, FEPM)
Silicone:
Silicone (VMQ, SIL)
Short Name
Aflas®:
Aflas®
Silicone:
Silicone
Common Names
Aflas®:
Aflas, TFE/P, FEPM
Silicone:
Silicone, VMQ, PVMQ
Mechanical Properties
Specialty Resistances
Brake Fluids
Brake Fluids
Ozone
Ozone
Steam <400ºF
Odorless
Most Acids
Non-toxic
Skydrol Fluids
Wide Temperature Range
Low Molecular Weight Ethers
Dry Heat
Low Molecular Weight Esters
Ketones
Vacuum
Fungal Growth
Di-ester Lubricants
Oxygen
Halogenated Hydrocarbons
Silicone Oils
Ammonia
Animal Oils
Amines
Weathering And Sunlight
Acetone
Greases
Petroleum Oils
Vegetable Oils
Strong Acids
Compression Set
Gamma-ray Radiation
Hydrogen Sulfide (H2S)
Highly Reactive Inorganic Chemicals
Highly Reactive Organic Chemicals
Solvents
Hot Amines
Steam
Bases
Specialty Resistances
Aflas®
Steam <400ºF
Most Acids
Skydrol Fluids
Low Molecular Weight Ethers
Low Molecular Weight Esters
Vacuum
Di-ester Lubricants
Halogenated Hydrocarbons
Ammonia
Amines
Acetone
Petroleum Oils
Strong Acids
Gamma-ray Radiation
Hydrogen Sulfide (H2S)
Highly Reactive Inorganic Chemicals
Highly Reactive Organic Chemicals
Solvents
Hot Amines
Steam
Bases
Silicone
Odorless
Non-toxic
Wide Temperature Range
Dry Heat
Ketones
Fungal Growth
Oxygen
Silicone Oils
Animal Oils
Weathering And Sunlight
Greases
Vegetable Oils
Compression Set
Brands
Thermoflex®
Elastosil®
Silastic®
Brands
Aflas®
Silicone
Thermoflex®
Elastosil®
Silastic®
Limitations
Carbon Tetrachloride
Diluted Sodium Hydroxide
Aromatic Fuels
High Gas Permeability
Organic Refrigerants
Dynamic Applications
Ketones
Alkalis
Chlorinated Hydrocarbons
Aromatic Mineral Oils
Concentrated Solvents
Concentrated Acids
Hydrocarbon Fuels
Aromatic Hydrocarbons
Steam
Acids
Limitations
Aflas®
Carbon Tetrachloride
Aromatic Fuels
Organic Refrigerants
Ketones
Chlorinated Hydrocarbons
Silicone
Diluted Sodium Hydroxide
High Gas Permeability
Dynamic Applications
Alkalis
Aromatic Mineral Oils
Concentrated Solvents
Concentrated Acids
Hydrocarbon Fuels
Aromatic Hydrocarbons
Steam
Acids
Marco Rubber & Plastics is an industry leader in custom sealing solutions that go beyond the limits of catalog commodities. Since 1980, our solutions have delivered reliable, long-lasting success for customers worldwide. We offer the largest inventory of specialty and standard sealing solutions backed by best-in-class technology, service and support.
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