Cast polyurethane elastomers are built on either an MDI or a TDI isocyanate system, and the choice affects both the part and the machine. As a manufacturer of MDI/TDI-capable casting machines, here is how to choose — this is about picking the machine and system, not the raw-material chemistry alone.
| Factor | TDI System | MDI System |
|---|---|---|
| Abrasion / tear resistance | Very high | High |
| Dynamic / fatigue performance | Excellent | Good |
| Handling / odour | Needs care, higher vapour | Easier, lower vapour |
| Typical hardness range | Shore A 60–95 | Shore A 80 – Shore D |
| Common parts | Wheels, scrapers, screens, dynamic parts | Rollers, bushes, structural parts |
| Machine需求 | Precise temperature + ratio control | Precise ratio; simpler handling |
How to Decide
Choose a TDI-capable machine if your parts are dynamic and abrasive — mine screens, belt scrapers, high-performance wheels — where tear and fatigue life matter most. Choose an MDI-capable machine if you want easier, lower-odour handling and firmer/structural parts. Many shops run multi-component machines that handle both, so you can switch systems and adjust hardness without a new machine.
Which Machine
We supply multi-component MDI/TDI cast elastomer machines and TDI system machines for scrapers. See the full PU elastomer casting machine range.
FAQ
Which lasts longer, MDI or TDI parts?
Can one machine run both MDI and TDI?
Do you supply the MDI/TDI material?
Tell us your parts and hardness targets — we will propose the right MDI/TDI casting machine and quote.