of uncoated batting of example 4 a was placed in a 125 ml widemouthed laboratory bottle to which was added 85 g of kerosene the bottle containing the uncoated structure of the invention was rotated and shaken several times the bottle was opened inverted for 30 seconds and 1 7 g or 2 percent of fuel flowed out approximately 98 percent of the kerosene was retained by the structure in the second experiment 4 63 g of coated batting of sample f of example 4 b was placed in a 125 ml widemouthed laboratory bottle to which was added 85 57 g of kerosene the bottle containing the coated structure of the invention was rotated and shaken several times the bottle was opened inverted for 30 seconds and 82 46 g or 95 3 percent of fuel flowed out only less than 5 percent of the kerosene was retained by the stiffened coated structure these experiments show that the fuel retention is a function of the stiffness of the structure and not the mass of the structure per se the uncoated example would be useful as a tank liner to retard spillage in the case of tank penetration or rupture whereas the coated example would be useful where antislosh flame arresting and antistat properties and good flow rates are required in another series of examples the flow rates and antisloshing characteristics of various embodiments of the invention were demonstrated and compared to a currently used foam structure a nominal 6 inch od pyrex glass tube 6 feet long was sealed at both ends with removable plates having valves fitted in the plates the tube was suspended at its central portion in a trunnion assembly so that the entire tube could be rocked and or rotated 360 degrees this tube.