Highly-siliceous dealuminated zeolite, silicalite(end member of ZSM-5) was synthesized from a batch composition of 2.55 Na₂O-5.0 TPABr -100SiO ₂ -2800H₂0 at 180 ℃ and at times ranging from one to seven days of reaction time. Autoclaves containing the synthesis mixture were centrifuged within the specially-equipped convection oven to provide an elevated gravitational force field like 30 and 50 G. Tests were also conducted at normal gravity. For synthesis performed under elevated gravities, average and maximum crystal sizes were substantially greater than those synthesized under normal gravity and product yields were also found to be affected by elevated gravity ; that is, product yields were substantially enhanced under elevated gravity from 4 % to 55 % with respect to normal gravity. The average crystal sizes of silicalite synthesized at normal gravity were 50 to 70μm over an entire range of reaction time, one to seven days while the average crystal sizes synthsized under elevated gravities, 30 and 50 G, were 160 to 190μm respectively. For the elevated gravity, in particular, two separate nucleations and growths were observed. For examples, at 50 G, large crystals of 200μm were produced through the second growing stage after 5 days of reaction following the rapid first growing stage where fairly large crystals of 135μm were produced only in 2 days of reaction. The maximum crystal sizes obtained through the above two growing stages were 190 and 300μm, respectively. A discussion of how elevated gravity affects nucleation, growth, yield and crystal size of silicalite is presented.