Ok.....I'm being hassled for not making enough posts and unfortunately posts I make outside this forum don't count. Even if they did it wouldn't matter since I'm not even allow near the modding forums and when I have tried to participate in discussions about the REST of the equipment I use I get shunned like a wet leper in a bath house. So.......I'll just talk to myself. Comment if you like. I will make every attempt to post things that are valuable information and know that I thoroughly research before I post. (That means I SKYPE bigblue30 and ask him if I'm right )
Solubility parameters..........why should you care?
For any actual scientist types out there I'm sorry....but I do have to dumb this WAY down simply to save space.
You should care because the use of PGA, everclear, pure grain alcohol, ethanol...whatever you call it is a common practice for us. I personally fill my ultrasonic cleaner with it. So here is the wiki definition:
"The Hildebrand solubility parameter (δ) provides a numerical estimate of the degree of interaction between materials, and can be a good indication of solubility, particularly for non polar materials such as many polymers. Materials with similar values of δ are likely to be miscible."
OK miss smartypants squirrel...that that still doesn't explain why we care. Well...in the spirit of the ECF mantra...pictures or it didn't happen..this is why:
Fortunately I was astute enough to contact a real scientist BEFORE I sent a scathing email demanding my money back for those tanks. That happened btw after a 30 second rinse/dump with PGA.....and it happened INSTANTLY.....they popped in half in my hand...it was really quite amazing. So that is how I found out about solubility parameters. Here is an excerpt from the email I received:
Compare the solubility parameter of the chemical to the solubility parameter of the plastic. If the two numbers are close (within about one point), then the chemical may dissolve, swell, or crack the plastic.
The solubility parameter for PMMA ranges from 8.9 - 12.7, depending on the grade.
The solubility parameter for glycerol is 21.1. This is more than one point different from the solubility parameter of the plastic, so no problem.
The solubility parameter for propylene glycol is 14.8. This is also more than one point different from the solubility parameter of the plastic, so again no problem.
The solubility parameter for ethanol is 12.9. Depending on the grade of PMMA you have, this is potentially very close to the solubility parameter of the plastic. This could definitely explain the cracking... although completely destroying the tank in under 30 seconds is still impressive!
If you think this through you will quickly realize why this is so important to us. The number of variables that can be involved are staggering.....because heat and pressure undoubtedly effect these interactions as well as the addition of other chemicals. I also asked him if plastic can off gas while it's submerged and the answer was yes...it can. But for the time being, lacking exhaustive studies etc I would say it's a safe for me to recommend that you don't use PGA to clean any plastic vaping gear. Because there is a RANGE here....everything isn't just going to self destruct....but you could weaken it enough for it to fail under use and who knows what the BYPRODUCTS of these reactions are.
oh and do I even need to point out......tank crackers.......I have always thought this and now Ifeel I was right....if it cracks your vaping vessel maybe you shouldn't be vaping it.
Cheers!!! As your reward for reading through this I'll let you see something out of my collection...since...sniffsniff....I'm not allowed to come out an play anywhere else.....this is the valentine vapemail I sent myself...Thats the NGP Moon...hand made on a lathe in Hungary.....dual coil hybrid dripper....one of 5 in the world. What you can't see is the switch.....the first and only magnetic slide switch.....you dont push it....you slide it with your pinky.
oh yea....brushed brass hybrid drip tip by 2Puffs
Solubility parameters..........why should you care?
For any actual scientist types out there I'm sorry....but I do have to dumb this WAY down simply to save space.
You should care because the use of PGA, everclear, pure grain alcohol, ethanol...whatever you call it is a common practice for us. I personally fill my ultrasonic cleaner with it. So here is the wiki definition:
"The Hildebrand solubility parameter (δ) provides a numerical estimate of the degree of interaction between materials, and can be a good indication of solubility, particularly for non polar materials such as many polymers. Materials with similar values of δ are likely to be miscible."
OK miss smartypants squirrel...that that still doesn't explain why we care. Well...in the spirit of the ECF mantra...pictures or it didn't happen..this is why:
Fortunately I was astute enough to contact a real scientist BEFORE I sent a scathing email demanding my money back for those tanks. That happened btw after a 30 second rinse/dump with PGA.....and it happened INSTANTLY.....they popped in half in my hand...it was really quite amazing. So that is how I found out about solubility parameters. Here is an excerpt from the email I received:
Compare the solubility parameter of the chemical to the solubility parameter of the plastic. If the two numbers are close (within about one point), then the chemical may dissolve, swell, or crack the plastic.
The solubility parameter for PMMA ranges from 8.9 - 12.7, depending on the grade.
The solubility parameter for glycerol is 21.1. This is more than one point different from the solubility parameter of the plastic, so no problem.
The solubility parameter for propylene glycol is 14.8. This is also more than one point different from the solubility parameter of the plastic, so again no problem.
The solubility parameter for ethanol is 12.9. Depending on the grade of PMMA you have, this is potentially very close to the solubility parameter of the plastic. This could definitely explain the cracking... although completely destroying the tank in under 30 seconds is still impressive!
If you think this through you will quickly realize why this is so important to us. The number of variables that can be involved are staggering.....because heat and pressure undoubtedly effect these interactions as well as the addition of other chemicals. I also asked him if plastic can off gas while it's submerged and the answer was yes...it can. But for the time being, lacking exhaustive studies etc I would say it's a safe for me to recommend that you don't use PGA to clean any plastic vaping gear. Because there is a RANGE here....everything isn't just going to self destruct....but you could weaken it enough for it to fail under use and who knows what the BYPRODUCTS of these reactions are.
oh and do I even need to point out......tank crackers.......I have always thought this and now Ifeel I was right....if it cracks your vaping vessel maybe you shouldn't be vaping it.
Cheers!!! As your reward for reading through this I'll let you see something out of my collection...since...sniffsniff....I'm not allowed to come out an play anywhere else.....this is the valentine vapemail I sent myself...Thats the NGP Moon...hand made on a lathe in Hungary.....dual coil hybrid dripper....one of 5 in the world. What you can't see is the switch.....the first and only magnetic slide switch.....you dont push it....you slide it with your pinky.
oh yea....brushed brass hybrid drip tip by 2Puffs