Does any have the weights for empty ISO canisters? 100, 250 and 450g's. Need to figure out what I have left in them.

110-3.5 oz
227-5 oz
450-7 oz
They vary a bit, but this will get you close.

Thank you

Mike, the information I have accumulated is the full weight. The net weights are listed on the canisters; in addition new MSR canisters list both net and gross. I weigh them before/after, before/after until empty, subtract weight after from before, subtract that difference from net fuel weight for remaining.

Jetboil-

100 gram (3.52 oz.) fuel = 7 1/8 oz. full
230 gram (8.11 oz.) fuel = 13 1/2 oz.


MSR-

110 gram (3.9 oz.) fuel = 7.4 oz. full
227 gram (8.0 oz.) fuel = 12.4 oz.
450 gram (16 oz.) fuel = 23.25 oz.

If you find yourself with several partially empty canisters this little gizmo works well for transferring fuel to top off the canisters. The included instructions are only in Chinese but the Amazon.com listing Q&A is helpful. I consolidated 3 less than half full canisters down to one mostly full canister in minutes over the weekend. Its a little pricey but I figure I will get years of use out of it and it will eventually pay for itself in saved fuel and less clutter in the gear boxes/shelves.

G-Works Gas Saver

Thanks guys

Found this info from JetBoil online for full and empty weights for the 3 sizes of canisters. My experience is the canisters and hence the gross weight is higher, but varies from canister to canister and from manufacturer to manufacturer. I adopted the habit of weighing new ones, marking it on the bottom, weighing before packing, marking, weighing after use and marking the weight and remaining fuel.

boonie: "Found this info from JetBoil online for full and empty weights for the 3 sizes of canisters. My experience is the canisters and hence the gross weight is higher, but varies from canister to canister and from manufacturer to manufacturer. I adopted the habit of weighing new ones, marking it on the bottom, weighing before packing, marking, weighing after use and marking the weight and remaining fuel. "

Mine have varied especially between brands. One thing, the makers fill by weight not volume and should never be filled or re-filled past the stated capacity. Safer to re-fill to a lower fill weight. The use of a scale is fairly important to prevent building a grenade!

butthead

Yes, there's more difference between brands and you probably noticed my weights were a bit heavier than listed in the link. That post was several years old though. Also for anyone reading this post. the amount of gas in the canister sometimes varies slightly from one brand to another.

So does anybody refill their iso canisters from other sources/other fuels?

Yes I know you have to do it by weight. And yes I see you can fill small cans from larger cans and keep any size topped off that way.

But you can also fill with butane from the other type of cartridge that costs about $2.99 each, much cheaper than using isobutane.

Most isobutane cartridges are actually an isobutane/propane mix. You need to propane especially at colder temps. With the right fittings, you could put 20% propane in the cartridge first, then top off with butane for the perfect 80/20 mix. I assume. I have all the fittings. But if you fill an isobutane cartridge with pure propane and 1)you are probably overpressurizing the cartridge and 2)your stove is certainly turbocharged. Not a good idea.

Joe

There is, of course, a little variance. Probably more from one scale to another as well.
My empty 100's are between 98 & 101 grams on my scale.
250's are between 147 & 149 grams.
Don't have a 450 empty to weigh...sorry.

TipsyPaddler, Could you help me understand how this G-GasWorks device works. If you connect 2 cans I do not see how it can do anymore than equalize pressure between them. Without a pump or heating one to create pressure to force liquid to the other cannister, I am baffled? Am I missing something. Its a great idea, I just do not understand how it works?
Thanks,

MB

MossBack: "TipsyPaddler, Could you help me understand how this G-GasWorks device works. If you connect 2 cans I do not see how it can do anymore than equalize pressure between them. Without a pump or heating one to create pressure to force liquid to the other cannister, I am baffled? Am I missing something. Its a great idea, I just do not understand how it works?
Thanks,


MB"

MB, scroll down to the "product description" section of the link--they recommend putting the "receiving" canister in the freezer for 10-20 minutes to drop its pressure, allowing the top (inverted) canister to push most of its fuel into the lower canister.

TZ

TrailZen: "

MossBack: "TipsyPaddler, Could you help me understand how this G-GasWorks device works. If you connect 2 cans I do not see how it can do anymore than equalize pressure between them. Without a pump or heating one to create pressure to force liquid to the other cannister, I am baffled? Am I missing something. Its a great idea, I just do not understand how it works?
Thanks,



MB"

MB, scroll down to the "product description" section of the link--they recommend putting the "receiving" canister in the freezer for 10-20 minutes to drop its pressure, allowing the top (inverted) canister to push most of its fuel into the lower canister.


TZ"

Donor canister should be warm. Maybe leave it out in the sun. Not crazy hot or anything. Receiving canister should be ice cold.

Propane has higher vapor pressure. So you could always fill with isobutane, and if you aren't quite full by weight, you can use propane to top it off without messing with warm and cold tanks. I would never use more than 20% propane because the canisters aren't meant for that much pressure

TipsyPaddler: "If you find yourself with several partially empty canisters this little gizmo works well for transferring fuel to top off the canisters. The included instructions are only in Chinese but the Amazon.com listing Q&A is helpful. I consolidated 3 less than half full canisters down to one mostly full canister in minutes over the weekend. Its a little pricey but I figure I will get years of use out of it and it will eventually pay for itself in saved fuel and less clutter in the gear boxes/shelves.


G-Works Gas Saver "

Thanks for this... I have lots of partial containers that I would love to consolidate.

good info.
I know propane has a higher vapor pressure. you put an isobutane stove on a 1 lb propane bottle and you can get a blowtorch! Don't ask me how I know. They make a fitting to do exactly that but I wouldn't recommend it. I also know that it is unsafe to refill a iso butane canister with straight propane, as it could burst. But many iso canisters are actually 80% propane 20% propane, for better cold weather performance...so there is a limit on how much propane I could safely mix with butane in a isobutane canister and I suspect it is 20%.

For a 100 gram capacity canister that is empty, I would add 80 grams butane from a butane cartridge, and then add 20 grams propane from a 1 pound propane bottle.
disclaimer: I would never suggest anybody refill disposable gas containers of any type.

Joe

"disclaimer: I would never suggest anybody refill disposable gas containers of any type."

I feel that way even a bit more vehemently. How much is being spent or saved to justify the chance of a campsite bomb? The Lindal valves just do not seem that robust. I use my stoves a bunch, liquid in cold weather and canister in warmer, but even with the experimenting I have done can not remember spending more than $25 in a year for canisters. I also often do vehicle based camps and just use up partials then.

butthead