SMAs contain particles that help control thixotropy, but are formulated so that these particles are sufficiently small to not agglomerate and plug even the smallest needles.

• 为了控制触变性能，贴片胶中一般含有适量的微粒，经精心配方的这些微粒必须保证足够微细，不至于对哪怕是最细小的针筒造成阻塞。