No abstract

Bureau of Ships, Navy Dep.r*nent, Waihington, D. C. r + WMeompounding a naturaHubbu with GRS in the proportion Po to SO, it i i &a geow to u u 3 par(, d rullw rathu than ~e u m t p~ & L r&n of chou Wled I n blending wid^ GR-S are, in order d prdance, Hevu, G y m g i n , domestic d d n a t d guayule, Maxiun daalmted guayule. Twenty p u u n t b b d i of thew mpccth rvbbvr in a GRS $to& am much bckir kfon rulunimUm than the sormponding 100 per m t G R S hock. At bnt cure and overcure the blends cantdming 3 par(, iulfur ganerally auwn the 100 per cent GRS stocla conthing either P or 3 NIIW in the folloMng ~IPCC& ultimate elongation at 82' and at 200' F., (ur ruistance at 82' and at 900" F., tenslle strangth at 200" F. The blendi . n abaut equ* to tk. 100 per cent OR-S in the followh~g mweubr m.sh.niul ' & c~. m , ultllmk elongation aftu o m aging, kmlb h n B h e n ktd at 8P' F. It ahould k noted cht cbm cenclu~lon, ~DDIV onlv to blendr of GRS wlth McUrd rubban whid hwa the.&m* c~ackrirtlcr u thor tmkd her.. LUB known to be deficient in building tack. Borne improvement is obtained by compounding

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