Foaming in Rotational Moulding. PE foam increases rigidity and stiffness of rotational moulded parts while minimising weight. Insulating properties of foam may also have useful applications. Rotational Moulding with PE foam is very simple if machine is equipped with proper process controls. "Vinodrai" machines are highly suitable for making foam products and insulated water tanks.Advantages of LLDPE Foam Tank.  Keeps Water Temperature Normal.  Higher Thickness and Rigid Tank.  Value added product, better customer prefrence.  Higher realization & better profits.