If you look through the weapons provisions of the California Code, you will often find "destructive device" and "explosive device" together.
First, the definition is quite explicit:
http://www.leginfo.ca.gov/cgi-bin/displaycode?section=pen&group=16001-17000&file=16100-1736016460. (a) As used in Sections 16510, 16520, and 16780, and in
Chapter 1 (commencing with Section 18710) of Division 5 of Title 2,
(6) Any sealed device containing dry ice (CO2) or other chemically
reactive substances assembled for the purpose of causing an
explosion by a chemical reaction.An example of one of the "explosive device" statutes is:
http://www.leginfo.ca.gov/cgi-bin/displaycode?section=pen&group=18001-19000&file=18710-1878018715. (a) Every person who recklessly or maliciously has in
possession
any destructive device or any explosive in any of the
following places is guilty of a felony:
(1) On a public street or highway.
(2) In or near any theater, hall, school, college, church, hotel,
or other public building.
(3) In or near any private habitation.
(4) In, on, or near any aircraft, railway passenger train, car,
cable road, cable car, or vessel engaged in carrying passengers for
hire.
(5) In, on, or near any other public place ordinarily passed by
human beings.
(b) An offense under subdivision (a) is punishable by imprisonment
in the state prison for a period of two, four, or six years.
So, while it may be a "destructive device", the statutes pertaining to destructive devices are the same ones which apply to explosive devices, as defined in the California Code.