TPE-S is a block copolymer based on styrene and butadiene.
Why choose it?
- Inexpensive but efficient material with good surface appearance. I usually start my search from TPE-S.
- It’s easy to find reference cases that show how the material has performed under similar conditions. Not being able to find good references is a good indication of the material’s suitability for the intended use.
- Wide hardness range including very soft grades.
- Good adhesion with most other thermoplastics in 2K applications.
- Transparent grades are available.
- Good UV-resistance when stabilized.
Why not choose it?
- Limited chemical resistance. TPE-V is often chosen over TPE-S in applications that are in contact with oil. Some of the new cross-linked products are said to have improved chemical resistance.
- Compared to other TPEs, thermal resistance is poor.
- Soft handles (2K) in electric tools and devices, pliers, screwdrivers and garden tools.
- Shoe soles (despite fairly poor abrasion resistance)
The cheaper SBS is also a TPE-S grade plastic. The difference is explained here.