only 31 u00b1 3 gpa a value much lower than either pure kevlar u00ae aramid fibers or pure tin a more useful number is found by calculating a modulus for the tin coating of the kevlar u00ae aramid fibers assuming the tin is a hollow cylinder this value 114 u00b1 5 gpa agrees with the modulus measured for a thin film of tin on silicon 116 u00b1 5 gpa indicating the tin coating is enduring the load and protecting the inner kevlar u00ae aramid fibers as desired further evidence that the tin coating is suppressing fiber buckling is indicated by the increased yield performance of the coated fiber comparison of tin coated kevlar u00ae aramid fibers with uncoated kevlar u00ae aramid fibers shows the coated fibers can endure higher loads ca 60 yield load improvement table 2______________________________________modulus e and yielddisplacement u03b4 on individual fibers uncoated kevlar u00ae aramid kevlar u00ae aramid fibers with 0 5 nicalon sic fibers u03bcm tin______________________________________e sub measured gpa 194 u00b1 7 77 u00b1 6 114 u00b1 5 31 u00b1 3 e sub literature gpa 180 200 83 u03b4 nm 2 2 u03bcm 3 6 u03bcm______________________________________ this value for the modulus assumes the load versus displacement response of the kevlar u00ae aramid fibers coated with 0 5 u03bcm tin is dominated by the properties of the hollow cylinder of tin this value is for the 34 composite 34 modulus i e assuming the response is evenly distributed over the diameter of the kevlar u00ae aramid fibers and the tin coating the results of the present description show that the use of plasma cvd e g microwave plasma cvd for the low temperature deposition.