gas expressing or centrifuging off excess fluid followed by oven or gas drying and the like to maintain flexibility and pliability the resulting webs may then be cut sliced punched or divided in other conventional ways due to the inherent strength and structural integrity of the webs more specifically a web of the microfibers may be dried in a vacuum oven for example at about 60 u00b0 c and will ordinarily reach desirable handling characteristics after 2 to 3 hours such a drying cycle typically produces product having a usp lod loss on drying of about 7 to 11 percent the drying time needed to produce such a product can be reduced by varying these conditions when heparin salt microfibers are overdried they become flaky and fragile but will absorb moisture under controlled humidity e g about 25 to 35 percent preferably 30 to 35 percent from the atmosphere and again become pliable the following examples are given for the purpose of further illustrating the invention but are not intended in any way to be limiting of the scope thereof all parts are given by weight unless otherwise specifically noted a sample of 10 g of sodium heparin u s p activity 161 units per milligram is dissolved in 15 g of water to provide a solution of 40.