Polycrystalline fiber bulk e maualalo le density, maualalo le vevela conductivity, lelei teʻi teʻi vevela, maualuga galuega temp, mautu vailaau lelei, lelei anti-corrosion ma isi mea, e masani ona faaaogaina i metallurgy, fausiaina, ceramics, aerospace, militeli etc alamanuia.