AU/EU

polyurethane

Polyurethane elastomers (AU/EU) are the elastomer versions of polyurethane (PUR).
They are vulcanised materials and no longer have thermoplastic properties.
They are characterised by:

- Outstanding wear resistance
- High elasticity
- High impermeability

The material is used primarily for wear-resistant seals in hydraulics (mineral oil) and as a buffer element in machine construction.

Short designation	AU/EU
Brand name	Vulkollan® Bayflex®
Chemical description	Polyurethane
Mechanical properties
Hardness range [Shore A/D]	60 – 90
Wear resistance	Outstanding
Tensile strength [MPa]	20 – 50
Physical properties
Density [g/cm³]	1.25
Application temperatures
Temperature range, short-term [°C]	-40 – 120
Temperature range, continuous [°C]	-25 – 80
Other properties
Flammability according to UL 94	Burns (still HB)
Chemical resistance
Mineral grease and oils	++
Petrol	o
Weak/strong acids	-/--
Weak/strong alkalis	--/--
Perchloroethylene	--
Trichloroethylene	--
Acetone	--
Alcohols	--
Brake fluid	--
Hydrolysis resistance (hot water)	--
Weather/UV radiation	++

++ very good / + good / o satisfactory / - moderate (significant change to properties) / -- unsuitable

This information is for reference only; we do not assume any liability for its accuracy. The properties of elastomer materials are highly dependent on their specific composition and their additives.