Polyurethane Chart
| Property | MDI ester | MDI ether | TDI ester | TDI ether | PPDI | NDI |
|---|---|---|---|---|---|---|
| General characteristics | ||||||
| Typical hardness | Wide range, from soft (Shore A) to hard (up to Shore D) depending on formulation | |||||
| Polyol (water/chemical resistance) | Ester | Ether | Ester | Ether | depending on formulation | depending on formulation |
| Relative material cost | $$ | $$ | $$ | $$ | $$$$$ | $$$$$ |
| Physical & mechanical properties | ||||||
| Abrasion | VG | G–VG | VG | VG | E | E |
| Cut / tear resistance | VG | G | VG | G–VG | E | E |
| Rebound / resilience | M–G | VG | M–G | VG | VG–E | E |
| Low hysteresis (little heat build-up) | M | G–VG | M | G–VG | VG–E | E |
| Load capacity | G–VG | G–VG | G–VG | G–VG | G–VG | E |
| Dynamic fatigue (flex) | M–G | VG | G | VG | E | E |
| Heat resistance (service) | G | G | G–VG | G–VG | E | VG |
| Water & chemical resistance | ||||||
| Immersion / permanent humidity | P–M | E | P–M | E | VG | M–G |
| Hydrolysis / hot water | P | VG | P | VG | VG | M–G |
| Oils & greases | VG | G | VG | G | VG | VG |
| Aliphatic solvents / diesel | G–VG | M–G | G–VG | M–G | G–VG | G |
| Aromatic solvents | P | P | P | P | M–P | M–P |
| Ketones, MEK, chlorinated solvents | NR | NR | NR | NR | P–NR | P–NR |
| Typical uses | ||||||
| Recommended application | Economical wear part, away from water | Standard wheel or guide roller, wet environment | Scrapers, skirting, abrasive and oily environments | Standard wheel or guide roller, wet / washdown environment | High-performance seals, heat and fatigue resistance | Heavy-duty material handling wheel, high speed / NVH |
Legend:
E Excellent
VG Very good
G Good
M Medium
P Poor
NR Not recommended
| Cost: $ economical → $$$ premium.
Indicative values, not contractual, taken from the Soremag polyurethane guide. Each system comes in many hardness and formulation variants; FDA / food-contact and antistatic grades on request. Low hysteresis “E” = little heat build-up (an advantage).