Yet Another Thread About Duster Gas & Green Gas... With a Twist?

MadMax · May 17th, 2011, 02:54

Well, put your GBB on a chrony. It's hard to appreciate your performance impressions without some qualitative results. Are you filling mags once and doing your test or have you tried counting shots over a few fillings on the same mag?

GBBs are finicky devices. A bad mag or a poor fill (not completely filled) and all sorts of things can go bad. It's a given that some models are designed to work best with certain propellants. Lay out your testing procedure more specifically so that others can replicate your results and benefit from your work. It would also help to measure the ambient temperature that you let your mags stabilize to. 5min is not long enough for a magazine to warm up to room temp for comparisons. If you touch a thermocouple to a mag 5min after filling it will still be substantially below room temp. Most liquid thermometers have too much thermal mass to make good rigid contact measurements.

yoyit2 · May 17th, 2011, 03:23

good point. i was doing more of a general test of what the GBB would go through during a typical day of use.

as far as fill & fire, i have filled the mags with said gas, let sit for 5 mins at room temp, fired, and repeated. my results have been repeated about 3-4 times.

GBB with metal slide is 3 weeks old. GBB with plastic slide is 2 weeks old. tested with 3 mags: 2x 25rnd & 1x 50rnd.

i will do my best to redo my testings with better procedures hopefully this week. video maybe?

iKliiu · May 17th, 2011, 15:56

Quote:

Originally Posted by kullwarrior

at SATP
HFC134a is around ~75
HFC152 is around ~61
Propane is around ~110
Propylene is around ~130
R440A is around ~160 (Non-HFC compound commonly used as a refrigeant, in US there's a group of people actually using it for their GBB for winter games.)

Does standard airsoft propane adapters work with propylene cans? Assuming that you have tried propylene before.

MadMax · May 17th, 2011, 17:32

Nitrile rubber is not compatible with propylene exposure. A lot of orings (like the ones in GBB mags) are nitrile. While the exposure of rubber seals to propellant in most guns is pretty momentary (shot to shot), magazine seals are pretty much soaked in liquid propellant when they're filled.

Crunchmeister · May 17th, 2011, 17:42

Stick with 134A or propane. Those 2 are safe for your seals and other rubber components. The other gases will eat them away.

yoyit2 · May 17th, 2011, 18:35

so... why is it that 134a renders useless for me? im kinda stumped by it :S

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May 17th, 2011, 02:54	#16
MadMax Delierious Designer of Dastardly Detonations Trader rating Join Date: Dec 2001 Location: in the dark recesses of some metal chip filled machine shop	Well, put your GBB on a chrony. It's hard to appreciate your performance impressions without some qualitative results. Are you filling mags once and doing your test or have you tried counting shots over a few fillings on the same mag? GBBs are finicky devices. A bad mag or a poor fill (not completely filled) and all sorts of things can go bad. It's a given that some models are designed to work best with certain propellants. Lay out your testing procedure more specifically so that others can replicate your results and benefit from your work. It would also help to measure the ambient temperature that you let your mags stabilize to. 5min is not long enough for a magazine to warm up to room temp for comparisons. If you touch a thermocouple to a mag 5min after filling it will still be substantially below room temp. Most liquid thermometers have too much thermal mass to make good rigid contact measurements. __________________ Want nearly free GBB gas?

May 17th, 2011, 03:23	#17
yoyit2 Trader rating Join Date: Apr 2010 Location: Abbotsford, BC	good point. i was doing more of a general test of what the GBB would go through during a typical day of use. as far as fill & fire, i have filled the mags with said gas, let sit for 5 mins at room temp, fired, and repeated. my results have been repeated about 3-4 times. GBB with metal slide is 3 weeks old. GBB with plastic slide is 2 weeks old. tested with 3 mags: 2x 25rnd & 1x 50rnd. i will do my best to redo my testings with better procedures hopefully this week. video maybe? __________________ If at first you don't succeed... throw a frag!

May 17th, 2011, 17:32	#19
MadMax Delierious Designer of Dastardly Detonations Trader rating Join Date: Dec 2001 Location: in the dark recesses of some metal chip filled machine shop	Nitrile rubber is not compatible with propylene exposure. A lot of orings (like the ones in GBB mags) are nitrile. While the exposure of rubber seals to propellant in most guns is pretty momentary (shot to shot), magazine seals are pretty much soaked in liquid propellant when they're filled. __________________ Want nearly free GBB gas?

May 17th, 2011, 17:42	#20
Crunchmeister Trader rating Join Date: Nov 2007 Location: In your bedroom going though your underwear drawer	Stick with 134A or propane. Those 2 are safe for your seals and other rubber components. The other gases will eat them away. __________________

May 17th, 2011, 18:35	#21
yoyit2 Trader rating Join Date: Apr 2010 Location: Abbotsford, BC	so... why is it that 134a renders useless for me? im kinda stumped by it :S __________________ If at first you don't succeed... throw a frag!

Yet Another Thread About Duster Gas & Green Gas... With a Twist?

Airsoft Guns Discussion