Pillow tanks are made with high resistance PVC sheet with 0.9mm thickness and are welded with high frequency (HF) soldering techniques. The bladder walls are made of polyester with PVC induction. The materials used in bladder walls are generally UV resistant and are chosen for their chemical stability and resistance to mechanical abrasion. Additionally, they are fabricated specifically to allow the tank to stand independent of any external support. Bladder tanks have many practical applications and can be found in agriculture, industry, civil protection, military and humanitarian organizations. Bladder tank capacities range from 500 to 18,000 litres.