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The tanks must be designed to safety standards for a [[pressure vessel]]. [[ISO 11439]] is a similar standard, for compressed natural gas tanks.<ref>{{cite web|url=http://www.iso.org/iso/catalogue_detail?csnumber=33298 |title=Gas cylinders – High pressure cylinders for the on-board storage of natural gas as a fuel for automotive vehicles |publisher=Iso.org |date=2006-07-18 |accessdate=2010-10-13}}</ref>
The air storage tanks usable in compressed air cars can be low pressure (9 atm) or high pressure (240+ atm). Thus, they can be made of [[composite material]]s like [[thermoplastic]]s and fiber reinforced thermoplastics,<ref name="compositesworld.com"/><ref name="plastics.gl">{{cite web|url=https://www.plastics.gl/automotive/high-pressure-gas-tanks-in-thermoplastic-composites/ |title=High pressure gas tanks in thermoplastic composites |publisher=plastics.gl |date=2014-05-01 |accessdate=2014-05-01}}</ref> This might permit low priced tankage. It might be made by [[rotational molding]]. Such tanks can be much lighter than [[
To reduce car weight further the [[pressure vessels]] can be used as structural parts of the [[chassis]]. Advanced 700-atmosphere pressure vessels have been developed for [[hydrogen cars]]. [[Crash tests]] showed good safety. Fiber reinforced [[thermoplastic]] tanks only rupture in collisions. They do not shatter or explode.<ref name="hyundaimotorgroup">{{cite web|url=https://news.hyundaimotorgroup.com/Article/Hydrogen-Tank-Safety-Proven |title=OHydrogen Tank: Safety Proven (OA-ICAES) System |publisher=hyundaimotorgroup |accessdate=2019-07-13}}</ref>
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