Fluorosilicone vs Polyurethane for O-Rings and Seals
Fluorosilicone (FVMQ, FSIL) | Polyurethane (PU, TPU) |
Description | Both materials are well suited for use in the -23 to 66°C range. Fluorosilicone has an advantage in lower temperatures and Fluorosilicone 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, Fluorosilicone has a slight advantage. The differences in compression set resistence show that Fluorosilicone has a slight advantage. Additionally, Fluorosilicone has a slight advantage when considering wear resistance. Also, Fluorosilicone has a significant advantage when comparing heat stability. Furthermore, Polyurethane has a significant advantage when comparing short term resilience. Finally, Polyurethane has a significant advantage when evaluating differences in permeation resilience. Both materials are resistant to ozone, common fuels, chlorinated hydrocarbons, aging, weathering and sunlight, silicone oils and some petroleum oils, with Fluorosilicone having specific resistences to compression set, vegetable oils, aromatic hydrocarbons, oxidizing chemicals, animal oils, chlorinated solvents, diluted alkalies, diester oils, aliphatic fluorocarbons, aromatic fluorocarbons, toluene, benzene, jet fuels, phosphate esters, dry heat, wide temperature range, ammonia and some acids. Polyurethane has specific resistence to mineral oils, greases, aliphatic hydrocarbons, hydraulic fluids, water, oxygen, tear, brake fluids, silicone greases and some hydrocarbon fuels. | |
| Compounds |
|---|
| Marco Compound Number | Datasheet | Hardness (Shore A) | Color | Low Temp | High Temp | Features | |
|---|---|---|---|---|---|---|---|
| Compound: F1001 | Datasheet:  | Hardness: 70 | Color: Blue | Low Temp: -100 °F (-75 °C) | High Temp: 350 °F (180 °C) | Description: Aerospace Military Specification Mil-Spec AMS-R-25988 M25988/1-### per Mil-R-25988 CL-1 GR-70, jet fuel resistance | |
| Compound: F1002 | Datasheet: | Hardness: 75 | Color: Blue | Low Temp: -80 °F (-65 °C) | High Temp: 350 °F (180 °C) | Description: Aerospace Military Specification Mil-Spec AMS-R-25988 M25988/2, jet fuel resistance | |
| Compound: F1003 | Datasheet: | Hardness: 60 | Color: Blue | Low Temp: -100 °F (-75 °C) | High Temp: 350 °F (180 °C) | Description: Aerospace Military Specification Mil-Spec AMS-R-25988 M25988/3, jet fuel resistance | |
| Compound: F1006 | Datasheet: | Hardness: 40 | Color: Blue | Low Temp: -100 °F (-75 °C) | High Temp: 350 °F (180 °C) | Description: Jet fuel resistance | |
| Compound: P1000 | Datasheet: | Hardness: 70 | Color: Yellow translucent | Low Temp: -65 °F (-55 °C) | High Temp: 250 °F (125 °C) | Description: High performance 70 durometer Polyurethane | |
| Compound: P1001 | Datasheet: | Hardness: 90 | Color: Yellow translucent | Low Temp: -65 °F (-55 °C) | High Temp: 250 °F (125 °C) | Description: High performance 90 durometer Polyurethane | |
| Compound: P1004 | Datasheet: | Hardness: 90 | Color: Translucent | Low Temp: -30 °F (-35 °C) | High Temp: 180 °F (85 °C) | Description: General purpose 90 durometer Polyurethane | |
| Compound: P1006 | Datasheet: | Hardness: 70 | Color: Translucent | Low Temp: -30 °F (-35 °C) | High Temp: 180 °F (85 °C) | Description: General purpose 70 durometer Polyurethane |
| Temperature Range Comparison |
|---|
Box: Base Material Family Range
Whiskers: Specialty Compounds
| General Information | ||
|---|---|---|
Full Name | Fluorosilicone: Fluorosilicone (FVMQ, FSIL) | Polyurethane: Polyurethane (PU, TPU) |
Short Name | Fluorosilicone: Fluorosilicone | Polyurethane: Polyurethane |
Common Names | Fluorosilicone: Fluorosilicone, FVMQ | Polyurethane: Urethane, AU, EU, PU |
| Mechanical Properties |
|---|
| Specialty Resistances | ||
|---|---|---|
Aging | Aging | |
Chlorinated Hydrocarbons | Chlorinated Hydrocarbons | |
Common Fuels | Common Fuels | |
Ozone | Ozone | |
Silicone Oils | Silicone Oils | |
Some Petroleum Oils | Some Petroleum Oils | |
Weathering And Sunlight | Weathering And Sunlight | |
Some Acids | Some Hydrocarbon Fuels | |
Ammonia | Silicone Greases | |
Wide Temperature Range | Brake Fluids | |
Dry Heat | Tear | |
Phosphate Esters | Oxygen | |
Jet Fuels | Water | |
Benzene | Hydraulic Fluids | |
Toluene | Aliphatic Hydrocarbons | |
Aromatic Fluorocarbons | Greases | |
Aliphatic Fluorocarbons | Mineral Oils | |
Diester Oils | ||
Diluted Alkalies | ||
Chlorinated Solvents | ||
Animal Oils | ||
Oxidizing Chemicals | ||
Aromatic Hydrocarbons | ||
Vegetable Oils | ||
Compression Set |
| Specialty Resistances | |
|---|---|
| Fluorosilicone | Some Acids Ammonia Wide Temperature Range Dry Heat Phosphate Esters Jet Fuels Benzene Toluene Aromatic Fluorocarbons Aliphatic Fluorocarbons Diester Oils Diluted Alkalies Chlorinated Solvents Animal Oils Oxidizing Chemicals Aromatic Hydrocarbons Vegetable Oils Compression Set |
| Polyurethane | Some Hydrocarbon Fuels Silicone Greases Brake Fluids Tear Oxygen Water Hydraulic Fluids Aliphatic Hydrocarbons Greases Mineral Oils |
| Brands | ||
|---|---|---|
Silastic® | Vibrathane® | |
Millathane® | ||
Adiprene® |
| Brands | |
|---|---|
| Fluorosilicone | Silastic® |
| Polyurethane | Vibrathane® Millathane® Adiprene® |
| Limitations | ||
|---|---|---|
Amines | Amines | |
Ketones | Ketones | |
Phosphate-ester Bases | Hot Water | |
Adelhydes | Alcohols | |
Hydrazine | Alkalis | |
Dynamic Applications | Ethers | |
Brake Fluids | Glycols | |
Esters | ||
Steam | ||
Acids |
| Limitations | |
|---|---|
| Fluorosilicone | Phosphate-ester Bases Adelhydes Hydrazine Dynamic Applications Brake Fluids |
| Polyurethane | Hot Water Alcohols Alkalis Ethers Glycols Esters Steam Acids |
