Beachcomber Posted December 13, 2021 Share Posted December 13, 2021 Following an idea on YouTube I soldered a bike valve stem into an empty bug spray can to make a can of pressurized air for general dusting use. I pressurize the can to about 75psi and it works quite well with good blast of air coming out of the nozzle. Problem is the air only last a couple of seconds before the can is empty and has to be refilled again. My can of compressed air is 600ml yet a can of air from the shop which lasts a long time and gives may blasts of air is only 220ml. How come the can from the shop with less than half the air lasts so much longer than my home made air can ???? What am I missing ???? 1 Link to comment Share on other sites More sharing options...
Upnotover Posted December 13, 2021 Share Posted December 13, 2021 Don't those cans also contain a propellant? 1 Link to comment Share on other sites More sharing options...
bbko Posted December 13, 2021 Share Posted December 13, 2021 Those store bought air dusters are NOT canned air, they're filled with a propellent such as HFC-152a. 1 Link to comment Share on other sites More sharing options...
Beachcomber Posted December 13, 2021 Author Share Posted December 13, 2021 2 minutes ago, Upnotover said: Don't those cans also contain a propellant? Wat! the bug cans? Obviously bug cans have the bug stuff in them and this is sprayed out by the propellant. So theoretically there is even less actual air/propellant in one of those than the capacity on the tin, which makes even more of a question why I'm getting so little air out of my homemade air can. As for the shop bought can I don't know how that works. I assumed that it was just full of compressed air. Link to comment Share on other sites More sharing options...
The Hammer2021 Posted December 13, 2021 Share Posted December 13, 2021 A life? 1 Link to comment Share on other sites More sharing options...
Beachcomber Posted December 13, 2021 Author Share Posted December 13, 2021 12 minutes ago, bbko said: Those store bought air dusters are NOT canned air, they're filled with a propellent such as HFC-152a. So is the whole can full of HFC-152a and that is what comes out, or is it jus a propellant for the air? Either way still does not explain the difference in air produced between the two cans. Could it be air molecules are smaller than HFC-152a and come out faster? 1 Link to comment Share on other sites More sharing options...
bbko Posted December 13, 2021 Share Posted December 13, 2021 https://www.techspray.com/everything-you-need-to-know-about-air-duster-but-were-afraid-to-ask 2 Link to comment Share on other sites More sharing options...
Beachcomber Posted December 13, 2021 Author Share Posted December 13, 2021 55 minutes ago, bbko said: https://www.techspray.com/everything-you-need-to-know-about-air-duster-but-were-afraid-to-ask Well that just about answers it. Thanks ???? Link to comment Share on other sites More sharing options...
Yellowtail Posted December 15, 2021 Share Posted December 15, 2021 And why is canned air so heavy? 1 Link to comment Share on other sites More sharing options...
sometimewoodworker Posted December 15, 2021 Share Posted December 15, 2021 2 hours ago, Yellowtail said: And why is canned air so heavy? Since caned air is often HFC-152a the main constant is 1,1-Difluoroethane, the molecular weight of difluoroethane is 66 so it is a lot heavier than air. 1 Link to comment Share on other sites More sharing options...
Yellowtail Posted December 15, 2021 Share Posted December 15, 2021 43 minutes ago, sometimewoodworker said: Since caned air is often HFC-152a the main constant is 1,1-Difluoroethane, the molecular weight of difluoroethane is 66 so it is a lot heavier than air. No kidding? Link to comment Share on other sites More sharing options...
Daffy D Posted December 15, 2021 Share Posted December 15, 2021 On 12/13/2021 at 8:35 PM, bbko said: https://www.techspray.com/everything-you-need-to-know-about-air-duster-but-were-afraid-to-ask Interesting experiment from "Beachcomber" seems you need "liquid air" to give volume for the concept to work. Is there such a thing? As for an "air duster" I found the electric air pump I got for the kids paddling pool works very well. https://www.lazada.co.th/products/rechargeable-electric-air-pump-inflatable-air-pump-inflate-deflate-for-outdoor-kayak-airbed-boat-fishingus-plug-i2661880577-s9577287854.html?spm=a2o4m.searchlist.list.13.15e27f05BA3j0j&search=1 The air flow is strong enough to blow out any dust and <deleted> from the computer and keyboard, specially if you use the thin pointy attachment. Cheaper non rechargeable mains/12v models are available that would do the same job, but I settled for the rechargeable so could let just let the kids get on with it without fear of electrocution. Link to comment Share on other sites More sharing options...
NanLaew Posted December 17, 2021 Share Posted December 17, 2021 On 12/13/2021 at 7:39 PM, Beachcomber said: What am I missing Maybe your hand if you insist on drilling holes in and pressurizing aerosol cans that aren't designed for such DIY escapades. 1 Link to comment Share on other sites More sharing options...
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