ʻO ka polycrystalline fiber bulk he haʻahaʻa haʻahaʻa, haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa, maikaʻi thermal shock kū'ē, kiʻekiʻe hana temp, maikaʻi kemika kūpaʻa, maikaʻi anti-corrosion etc.