So, you want to know more about this MDI polyurethane we sell?
Not a problem, let us give you facts.
All Hemi Performance MDI suspension components are Australian made by an Australian owned & operated company.
The two most frequently used isocyantes are
- TDI: toluene diisoyanate, and
- MDI: diphenylmethane diisocyanate.
All other Australian Valiant part manufacturers use TDI which is an outdated polyurethane technology.
Hemi Performance exclusively uses MDI polyurethane, which is most commonly used overseas in high performance suspension systems.
MDI is a denser product and therefore has a far better
- memory
- tear rate
- tensile strength
- performance
- impact absorption rate
- ride comfort
- flexibility and
- durability
MDI provides the ride characteristics of a rubber bushed car.
Molecular Structure
Figure 1 - Standard polyurethane structure.
Figure 2 - Hemi Performance polyurethane structure.
As pictured the molecules in figure 2 are smaller, denser, and staggered.
The tear ratio is superior in figure 2 as indicated by the arrows.
In figure 1 the bush can tear between the molecules.
In figure 2 the tear is stopped by another molecule at every angle.
This give a stronger more reliable bush.
Impact Absorption
Figure 1 - Standard polyurethane structure.
Figure 2 - Hemi Performance polyurethane structure.
As pictured the molecules in figure 2 are smaller, denser, and staggered.
The impact absorption is superior in figure 2 as indicated by the arrows.
In figure 1 the bush can absorb impact in only three directions.
In figure 2 the bush absorbs impact in five directions.
Therefore by the time the impact reaches the chassis it is relatively completely absorbed in figure 2.
This gives excellent ride comfort while maintaining stability and concise steering.
Advantages over other polyurethane
- Reliability - bush longevity
- Flexibility - memory to retain shape
- Durability - abrasion resistant
- Performance - ride comfort & stability
Using MDI bushes dramatically improves
- Performance
- Handling
- Comfort
- Safety
- Stability
- Sensitivity
- Steering feel
- Tyre wear
- Road holding
- Wheel alignment