𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞 : 𝐏𝐨𝐥𝐲𝐞𝐭𝐡𝐞𝐫 𝐏𝐔 𝐯𝐬 𝐏𝐨𝐥𝐲𝐞𝐬𝐭𝐞𝐫 𝐏𝐔 𝐑𝐞𝐬𝐢𝐧

𝐓𝐨𝐝𝐚𝐲'𝐬 𝐊𝐍𝐎𝐖𝐋𝐄𝐃𝐆𝐄 𝐒𝐡𝐚𝐫𝐞

🔬 𝐏𝐨𝐥𝐲𝐞𝐭𝐡𝐞𝐫 𝐏𝐔 𝐯𝐬 𝐏𝐨𝐥𝐲𝐞𝐬𝐭𝐞𝐫 𝐏𝐔 𝐑𝐞𝐬𝐢𝐧: 𝐖𝐡𝐢𝐜𝐡 𝐎𝐧𝐞 𝐒𝐡𝐨𝐮𝐥𝐝 𝐘𝐨𝐮 𝐂𝐡𝐨𝐨𝐬𝐞?

There's no universal winner.The key difference is the soft-segment chemistry, which influences how the PU resin behaves under different conditions.

Polyether PU：

💧 Typically better hydrolysis resistance

💧 Better suited to water and humidity exposure

Polyester PU：

🛢️ Typically stronger cohesive properties

🛢️ Better abrasion and oil resistance

🛢️ Suitable for applications requiring higher mechanical durability

But choosing a PU resin isn't as simple as comparing two labels.The final performance also depends on molecular weight, hard-segment ratio, isocyanate structure, chain extender and crosslinking.

🎯 That's why the better approach is: Application environment → Performance target → Failure risk → Resin structure.

💡 In polyurethane formulation, the best resin isn't necessarily the one with the highest individual performance. It's the one that provides the right balance for the application.

source : Tongfugui

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