𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞 : 𝐄𝐱𝐩𝐚𝐧𝐝𝐞𝐝 𝐓𝐏𝐔 𝐦𝐢𝐝𝐬𝐨𝐥𝐞𝐬: 𝐚 𝐧𝐢𝐜𝐡𝐞 𝐏𝐔 𝐚𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧 𝐫𝐞𝐬𝐡𝐚𝐩𝐢𝐧𝐠 𝐚𝐭𝐡𝐥𝐞𝐭𝐢𝐜 𝐟𝐨𝐨𝐭𝐰𝐞𝐚𝐫

 𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞

👟 𝐄𝐱𝐩𝐚𝐧𝐝𝐞𝐝 𝐓𝐏𝐔 𝐦𝐢𝐝𝐬𝐨𝐥𝐞𝐬: 𝐚 𝐧𝐢𝐜𝐡𝐞 𝐏𝐔 𝐚𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧 𝐫𝐞𝐬𝐡𝐚𝐩𝐢𝐧𝐠 𝐚𝐭𝐡𝐥𝐞𝐭𝐢𝐜 𝐟𝐨𝐨𝐭𝐰𝐞𝐚𝐫
Expanded TPU (ETPU) is becoming one of the most technically interesting polyurethane applications in athletic footwear, driven by its combination of rebound, durability, low-temperature elasticity, and potential recyclability.


Unlike conventional EVA chemical foaming, ETPU is produced through a supercritical physical foaming process using CO₂ or N₂. This allows the material to deliver stronger compression set resistance, better elastic recovery, and a cleaner processing route without chemical blowing-agent residues.

In performance terms, ETPU occupies an important middle ground in the midsole market. It offers clearly better rebound and long-term consistency than EVA, while remaining more commercially accessible than PEBA, which continues to dominate the top-end racing segment. That positioning has made ETPU especially relevant for daily training and mid-to-high-end running shoes.

A key material distinction is also emerging between aromatic and aliphatic TPU. Early ETPU products were largely based on aromatic TPU using MDI, which brought known yellowing issues under UV exposure. Aliphatic TPU, by contrast, offers significantly better photostability, and recent progress in domestic raw material supply is making aliphatic ETPU increasingly viable for broader footwear use.

The segment is also becoming more important from a polyurethane supply-chain perspective. Although ETPU midsoles remain small compared with major PU applications such as insulation or flexible foam, they are helping drive demand for higher-value raw materials, more specialized foaming technology, and new processing know-how across the chain.

For the PU industry, this is not a volume story first. It is a value-added story — one where material science translates directly into visible product differentiation and consumer experience.

🔗 Read the full breakdown: https://lnkd.in/gPCSats5

source : PU Daily

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