in chamber 6 to produce chemical reaction mixture 7 which is transported to reaction chamber 8 reaction chamber 8 is typically heated to approximately 450 u00b0 c to 800 u00b0 c to enable the reaction and to allow the vaporization of the reaction products to be expelled as products 9 onto collection surface 10 to form the reactive intermediate p xylylene a pyrolysis reaction tube was constructed the main element in the heated area was an inconel nickel alloy 600 tube 0 325 u2033 od u00d7 0 277 u2033 id u00d7 60 u2033 length grainger 3acp8 the tube was electrically heated to the indicated temperatures a flowing stream of argon gas mixture comprised of nitrous oxide airgas um1070 with xylene vapor aldrich 134449 4l in the carrier gas of argon airgas um 1006 was introduced to the tube at a total flow rate of 20 to 100 ml minute at a temperature of 450 u00b0 c to 630 u00b0 c and at atmospheric pressure the ratio of gases is adjusted to provide approximately molar stoichiometric ratios of 1 1 xylene to nitrous oxide the exit gas was comprised of a clear colorless flow of reactive gas condensation of the gas onto a cooled glass vessel resulted in the deposition of a colorless to.