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CORESTA Congress, Online, 2022, Smoke Science/Product Technology Groups, ST 75

Waterpipe bowls and heaters: Does the ISO standard reflect what is available to consumers of waterpipe tobaccos?

LAUTERBACH J.H.
Lauterbach & Associates, LLC, Macon, GA, U.S.A.

The waterpipe bowl and electric heater specified in ISO 22486:2019 “Waterpipe tobacco smoking machine — Definitions and standard conditions” are not typical of those available to users of waterpipe (shisha) tobaccos. There are no electric heaters available to the consumer that resemble the electric heater specified in ISO 22486, which does not use perforated foil, and the Egyptian-style bowl (ESB) specified in ISO 22486 does not have dimensions similar to those we have been able to purchase in the US (volume, number and spacing of holes in the bottom of the bowls). ESBs are not suitable for commercial dark air-cured (DAC) shishas. These products have much smaller particle size than their flue-cured (FC) counterparts and particles of tobacco and surrounding liquid are drawn through the holes and down into the base of the bowl during heating and puffing. Thus sample integrity is compromised during testing. Indeed, manufacturers and vendors of DAC shishas recommend use of the phunnel-style bowls. With the phunnel bowl, hot air from the glowing charcoal or from an electric heater passes over the bed of tobacco before exiting down the elevated center hole in the bowl. Using an electric heater taken from a large-size Hady E-Shisha Smokepan and a regulated DC power supply set at 12.5 VDC (~32 W), we were able to compare the ESBs with three sizes of phunnel bowls during runs of 180 three second puffs every 20 s, with puff volume similar to that specified in ISO 22486 and sample weight of 10 g. Shisha temperature was much less with the phunnel bowls, but loss of mass during use was lower with the larger bowls. Optimum bowl was a Tangiers small phunnel bowl. Test substance was a commercial mint-flavored DAC shisha and similar effects have been observed for flavored FC shishas.