I emailed the Dangerous Goods Office for BC Ferries and specifically asked about Primus and here is the response below. News to me, I have always carried these gas containers in my car to the Island on this ferry. Can’t say I didn’t know now. Ignorance WAS bliss.
Primus gas
UN2037
Shipping name of the product is “liquified petroleum gas’
Dangerous Goods Office
British Columbia Ferry Services Inc.
UN 2037 cannot be transported on closed deck vessels, and all the vessels operating on the route between Horseshoe Bay and Nanaimo are closed deck vessels. As such, this product cannot be transported.
