PU  Polyester-Professtional PU Polyester manufacturer and Supplier-KOLON

Abrasion Resistance Properties

There are two types of abrasion resistance sliding and impingement. Sliding refers to scraping and rubbing abrasion while impingement refers to particles or objects striking the urethane surface at a high angle.

Polyester has a high capacity for sliding abrasion resistance which makes it ideal for applications like scraper blades and chute liners.

Heat Resistance Properties

Both polyester and polyether urethanes perform well at elevated temperatures, however:

Polyesters withstand high temperatures longer and are more resistant to heat aging.

Low Temperature Flexibility

All elastomers (rubbers, urethanes, silicones, etc.) get harder and less flexible as temperatures drop and will eventually reach a temperature at which they become brittle. Urethane's brittle point is between -40°F and -100°F depending on the formulation.

Polyether is less affected by cold temperatures.

Hardness Properties

Both polyesters and polyether can be made to any hardness from marshmallow-soft to bowling ball hard.

Rebound Properties

Products such as skate wheels need to return the energy they absorb when your foot pushes them into the pavement (rebound); otherwise, you would feel like you are running in soft sand. Sand absorbs most of the energy from your foot and makes you run sluggishly.

Shock Absorption Properties

Sometimes you want the product to absorb the energy it receives (opposite of rebound).

Polyester is the choice for shock absorption and is used widely in vibration dampening applications.

RESISTANCE

Polyesters have higher tensile strength and higher cut and tear resistance than polyether.

Water and Moisture Resistance

If the product is to be submerged or used in a very humid condition it should be a Polyether because polyether has excellent hydrolytic stability.

Oil, Fuel and Solvent Resistance

If the product will encounter oils, fuel, or solvents (even vapors) your choice should be a Polyester as they are more resistant to attack from these harsh chemicals.