... , depending on road weight restrictions. Flexitanks are made using a single-layered, custom formulated blended polyethylene, the ingredients of ... TD (ASTM D882)750%Advantages of using flexitanks:. Very low positioning costs. No cleaning cost, No disposal costs . ... areas. Clean and environmentally friendly. No risk of contamination. Low weight of Flexitank - so higher payloads possible. No demurrage on ...