Polyurethane vs Aflas® for O-Rings and Seals

	Polyurethane (PU, TPU)	Aflas® (TFE/P, FEPM)


Description	Both materials are well suited for use in the -10 to 66°C range. Aflas® has an advantage in lower temperatures and Aflas® 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, both materials are equally Poor. The differences in compression set resistence show that Aflas® has a slight advantage. Additionally, Aflas® has a slight advantage when considering wear resistance. Also, Aflas® has a significant advantage when comparing heat stability. Furthermore, Polyurethane has a significant advantage when comparing short term resilience. Finally, Aflas® has a slight advantage when evaluating differences in permeation resilience. Both materials are resistant to ozone and brake fluids, with Polyurethane having specific resistences to common fuels, mineral oils, greases, aliphatic hydrocarbons, chlorinated hydrocarbons, aging, weathering and sunlight, silicone oils, hydraulic fluids, water, oxygen, tear, silicone greases, some petroleum oils and some hydrocarbon fuels. Aflas® has specific resistence 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.

Compounds

Marco Compound Number	Datasheet	Hardness (Shore A)	Color	Low Temp	High Temp	Features
Compound: L1000	Datasheet:	Hardness: 80	Color: Black	Low 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: L1003	Datasheet:	Hardness: 90	Color: Black	Low 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: L1009	Datasheet:	Hardness: 90	Color: Black	Low 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: L1011	Datasheet:	Hardness: 80	Color: Black	Low 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: 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

Units: F C

Box: Base Material Family Range

Whiskers: Specialty Compounds

General Information

Full Name	Polyurethane: Polyurethane (PU, TPU)	Aflas®: Aflas® (TFE/P, FEPM)
Short Name	Polyurethane: Polyurethane	Aflas®: Aflas®
Common Names	Polyurethane: Urethane, AU, EU, PU	Aflas®: Aflas, TFE/P, FEPM

Mechanical Properties

Specialty Resistances

	Brake Fluids	Brake Fluids
	Ozone	Ozone
	Some Hydrocarbon Fuels	Steam <400ºF
	Some Petroleum Oils	Most Acids
	Silicone Greases	Skydrol Fluids
	Tear	Low Molecular Weight Ethers
	Oxygen	Low Molecular Weight Esters
	Water	Vacuum
	Hydraulic Fluids	Di-ester Lubricants
	Silicone Oils	Halogenated Hydrocarbons
	Weathering And Sunlight	Ammonia
	Aging	Amines
	Chlorinated Hydrocarbons	Acetone
	Aliphatic Hydrocarbons	Petroleum Oils
	Greases	Strong Acids
	Mineral Oils	Gamma-ray Radiation
	Common Fuels	Hydrogen Sulfide (H2S)
		Highly Reactive Inorganic Chemicals
		Highly Reactive Organic Chemicals
		Solvents
		Hot Amines
		Steam
		Bases

Specialty Resistances
Polyurethane	Some Hydrocarbon Fuels Some Petroleum Oils Silicone Greases Tear Oxygen Water Hydraulic Fluids Silicone Oils Weathering And Sunlight Aging Chlorinated Hydrocarbons Aliphatic Hydrocarbons Greases Mineral Oils Common Fuels
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

Brands

	Vibrathane®
	Millathane®
	Adiprene®

Brands
Polyurethane	Vibrathane® Millathane® Adiprene®
Aflas®

Limitations

	Ketones	Ketones
	Hot Water	Carbon Tetrachloride
	Alcohols	Aromatic Fuels
	Alkalis	Organic Refrigerants
	Ethers	Chlorinated Hydrocarbons
	Glycols
	Esters
	Amines
	Steam
	Acids

Limitations
Polyurethane	Hot Water Alcohols Alkalis Ethers Glycols Esters Amines Steam Acids
Aflas®	Carbon Tetrachloride Aromatic Fuels Organic Refrigerants Chlorinated Hydrocarbons

Polyurethane vs Aflas® for O-Rings and Seals

Polyurethane (PU, TPU)

Aflas® (TFE/P, FEPM)