The tank shell is manufactured by the process called "Filament-Winding". The process begins by selecting the appropriate mandrel (cylindrical mold) and applying a separating agent. A resin-rich barrier is constructed by winding a surface tissue and impregnating it with the appropriate resin system conducive to the type of service the tank is intended to. On top of this layer, succeeding layers of the hoop and helical winding patterns are constructed to reinforce the tank against hoop and longitudinal loadings to a pre-determined thickness.
On occasions, other types of glass reinforcements are introduced to attain certain specific loading requirements. Cylinders produced by this process exhibit a high modulus of laminate. A property that tells the strength of materials. The specific gravity of laminate is in the range of 1.5 to 1.76 g/ml.