ポリウレタン（PU）フォーム用のシリコン界面活性剤を選択する場合、次の要因を考慮することができます。

• Silicone content 

Surfactants with higher silicone content have lower surface tension, which can increase the number of air bubbles in the foam. This can result in a smaller bubble size in the cured foam. 

• Siloxane backbone length 

Surfactants with longer siloxane backbones have higher film elasticity, which can lead to better foam cell stability and a slower drainage rate. 

• Application 

The surfactant can contribute to the foam’s physical properties depending on the application. 

l Structure 

The surfactant’s structure can be modified by changing the length of the PDMS hydrophobic backbone, the number, length, and composition of the pendent hydrophilic polyether chains. 

シリコン界面活性剤は、シリコン塩基、ポリエーテル、ポリエチレン酸化物鎖（EO）、およびポリプロピレン酸化物鎖（PO）で構成できます。