When selecting a cladding factory, you must prioritize material grade and durability. For aluminum facades, ensure the use of 3003 or 5005 series aluminum alloys for superior corrosion resistance. The coating is equally critical; PVDF (Polyvinylidene Fluoride) coatings are the industry standard for exterior use, offering a 20-year color-fade warranty and resistance to UV radiation. For stone or ceramic cladding, verify the water absorption rate is below 0.5% and the flexural strength meets international structural standards.