DMT - Not yet
Posts: 88 Joined: 07-Sep-2013 Last visit: 14-Nov-2019
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Hey guys,
So I know how I should look up the chemical make up and see if it is resistant but I seriously don't know what company or plastic the pipette is made out of.
I have 2 average looking plastic pipette's that I snagged from class, they look like the ones were you can get a bundle of 100 from $15
I know that a glass one is best but has anyone used plastic pipette when pulling and do you think that the naphta melts the plastic?
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☠ ⚡ ☣ ⚠ ☢
Posts: 599 Joined: 09-Nov-2011 Last visit: 10-Aug-2016 Location: Spirit World
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I would not use plastic at all for extractions. Phthalates: Warning to those using plastic containers/instruments in extractionsand using plastic for extraction?both listed on the FAQ. I use a glass turkey baster I bought on amazon.com and I use all glass items for extraction.
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DMT - Not yet
Posts: 88 Joined: 07-Sep-2013 Last visit: 14-Nov-2019
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Ok well thanks for the help, now I know for sure. And ill get my self a glass turkey baster soon!
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DMT-Nexus member
Posts: 1175 Joined: 10-Jun-2010 Last visit: 27-Dec-2024
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i see plastic in real labs all the time- folks around here think it is reaaally bad however
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DMT-Nexus member
Posts: 1711 Joined: 03-Oct-2011 Last visit: 20-Apr-2021
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dg wrote:i see plastic in real labs all the time- folks around here think it is reaaally bad however
Plastic is a generic name that includes many types of polymers. There's several types of plastic that will react with the aliphatic hydrocarbons used in extractions, or even with acetone. It might be really bad, or not, depending on the combination. For whoever is willing to do homework and check compatibility charts, some plastics might be an option. But as a general advice and to keep people safe, recommending "plastic" is not a good idea. "The Menu is Not The Meal." - Alan Watts
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DMT-Nexus member
Posts: 165 Joined: 12-Aug-2013 Last visit: 07-Jun-2014
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I have a turkey baster which is made out of silicon and HDP plastic, pretty sure that it works good, no sign of use after many ph13 solution transfers  After all my strong acids are also delivered in PEHD and it is safe! "Imagination is more important than knowledge."
Albert Einstein
"It's very, very dangerous to lose contact with living nature."
Albert Hofmann
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veni, vidi, spici
Posts: 3642 Joined: 05-Aug-2011 Last visit: 22-Sep-2017
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just because you cant see it doesn't mean its not there . INHALE, SURVIVE, ADAPT it's all in your mind, but what's your mind??? fool of the year
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DMT-Nexus member
Posts: 165 Joined: 12-Aug-2013 Last visit: 07-Jun-2014
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3rdI wrote:just because you cant see it doesn't mean its not there . yes, but if its not safe then acids could not be stored in PEHD... My lab retailer says pehd is as good as glass, there is no chance that the acid can get into it etc.. "Imagination is more important than knowledge."
Albert Einstein
"It's very, very dangerous to lose contact with living nature."
Albert Hofmann
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veni, vidi, spici
Posts: 3642 Joined: 05-Aug-2011 Last visit: 22-Sep-2017
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yeah sorry, I was just being silly, im sure that some plastics are fine to use, I just like glass INHALE, SURVIVE, ADAPT it's all in your mind, but what's your mind??? fool of the year
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omnia sunt communia!
Posts: 6024 Joined: 29-Jul-2009 Last visit: 11-Jun-2025
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vineseeker wrote:3rdI wrote:just because you cant see it doesn't mean its not there . yes, but if its not safe then acids could not be stored in PEHD... My lab retailer says pehd is as good as glass, there is no chance that the acid can get into it etc.. But measuring HDPE's tolerance to acids/bases is not the same as measuring its tolerance to non-polar solvents. Phillips, the company that manufactures HDPE, explicitly says that HDPE is not suitable for use with the NPS being used for extraction. Quote:In addition to many individual chemicals (mentioned below), Phillips lists two major classes of chemicals that are not compatible with HDPE: aromatic hydrocarbons, and halogenated hydrocarbons. The basic aromatic hydrocarbon is benzene (a major component of gasoline); others are toluene (also called methylbenzene), and the three xylenes (o-, m-and p-xylene). Others include naphthalene (moth balls), and pdichlorobenzene (also moth balls). These aromatic hydrocarbons "permeate excessively and cause package deformation," says Phillips Numerous people have seen NPS (including d-limonene) damage HDPE containers. You can't beat glass. Period. Wiki • Attitude • FAQThe Nexian • Nexus Research • The OHTIn New York, we wrote the legal number on our arms in marker...To call a lawyer if we were arrested. In Istanbul, People wrote their blood types on their arms. I hear in Egypt, They just write Their names. גם זה יעבור
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analytical chemist
 
Posts: 7463 Joined: 21-May-2008 Last visit: 09-Aug-2025 Location: the lab
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dg wrote:i see plastic in real labs all the time- folks around here think it is reaaally bad however
I have too, usually for storage of aqueous waste. I've also seen mass spectra of polymers in nonpolar solvents, after brief storage. Glass trumps plastic, there's not a nonpolar solvent around that will degrade it. "Nothing is true, everything is permitted." ~ hassan i sabbah
"Experiments are the only means of attaining knowledge at our disposal. The rest is poetry, imagination." -Max Planck
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DMT-Nexus member
Posts: 165 Joined: 12-Aug-2013 Last visit: 07-Jun-2014
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Quote:You can't beat glass. Period. of course thats true but since this is the pipette talk here, I really cannot believe that any solvent can degrade or do anything with PEHD in lets say (15sec) because that is the amount of time the solvent is in my baster.  Would you agree? "Imagination is more important than knowledge."
Albert Einstein
"It's very, very dangerous to lose contact with living nature."
Albert Hofmann
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DMT-Nexus member
Posts: 503 Joined: 11-May-2013 Last visit: 29-Nov-2020
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vineseeker wrote:Quote:You can't beat glass. Period. of course thats true but since this is the pipette talk here, I really cannot believe that any solvent can degrade or do anything with PEHD in lets say (15sec) because that is the amount of time the solvent is in my baster. Would you agree? I've used a plastic baster in the past and it seemed to be ok for the short time you need to pipet the solvent, but you need to be sure to immediately clean it thoroughly. Any NP solvent residue will start to degrade the plastics eventually - the bulb on my baster eventually glued itself to the plastic part, and the baster became very brittle and less transparent.
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omnia sunt communia!
Posts: 6024 Joined: 29-Jul-2009 Last visit: 11-Jun-2025
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vineseeker wrote:Quote:You can't beat glass. Period. of course thats true but since this is the pipette talk here, I really cannot believe that any solvent can degrade or do anything with PEHD in lets say (15sec) because that is the amount of time the solvent is in my baster. Would you agree? Nope. There are actually threads where people have melted their pipettes/basters. See benzyme's comment and endlessness' thread on this very subject. Plastic is not safe when dealing with these NPS. Any degradation of plastics is undesirable. Why would you risk any exposure to it? You can't beat glass. Period. Wiki • Attitude • FAQThe Nexian • Nexus Research • The OHTIn New York, we wrote the legal number on our arms in marker...To call a lawyer if we were arrested. In Istanbul, People wrote their blood types on their arms. I hear in Egypt, They just write Their names. גם זה יעבור
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Homo discens
Posts: 1827 Joined: 02-Aug-2012 Last visit: 07-Aug-2020
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vineseeker wrote:of course thats true but since this is the pipette talk here, I really cannot believe that any solvent can degrade or do anything with PEHD in lets say (15sec) because that is the amount of time the solvent is in my baster. Would you agree? That's what I thought at one point, then I watched a plastic dropper melt before my eyes in a matter of seconds, because I had tried to siphon my nonpolar solvent with it. That changed my mind pretty quickly. Glass pipettes are very easy to find. Is it really worth the risk of tainting such a miraculous compound? I mean, I certainly don't want to vape any plastic... 
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DMT-Nexus member
Posts: 165 Joined: 12-Aug-2013 Last visit: 07-Jun-2014
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Ive seen a stb extraction tek here somewhere in which the guy used plastic gallon containers to basify and to extract? I guess thats not the best idea then either ? "Imagination is more important than knowledge."
Albert Einstein
"It's very, very dangerous to lose contact with living nature."
Albert Hofmann
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DMT-Nexus member
Posts: 3207 Joined: 19-Jul-2011 Last visit: 02-Jan-2023
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vineseeker wrote:Ive seen a stb extraction tek here somewhere in which the guy used plastic gallon containers to basify and to extract? I guess thats not the best idea then either ? hdpe containers are safe regarding acidity and basification (even caustic bases like lye) the problem comes into play with solvent choice. though, i believe aliphatic solvents are safe to use with hdpe plastic. My wind instrument is the bong
CHANGA IN THE BONGA!
樹
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DMT-Nexus member
Posts: 1711 Joined: 03-Oct-2011 Last visit: 20-Apr-2021
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Relatively.  "The Menu is Not The Meal." - Alan Watts
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Rennasauce Man
Posts: 853 Joined: 27-May-2011 Last visit: 28-Feb-2025 Location: A Pale Blue Dot orbiting a GV2 Yellow Dwarf fusion powered Luminous Ball of Plasma at 30km/s
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hdpe pipettes are fine for alcohols, so long as its just being used to transfer a solvent momentarily. Limonene, however, will melt and eat away at hdpe. If your unsure, its best to just use glass. Glass pipettes really aren't that expensive, and a worthwhile investment. Hell, you might even have one lying around from a tincture bottle or something. Its not worth the risk imho, for the cost of a glass pipette, or sep funnel. They really aren't that expensive, or hard to find/purchase. And don't steal stuff from your school, glass pipettes, or even plastic pipettes, are not expensive. Just do it right, and act like an adult and buy your extraction equipment. Do you really need a pipette that bad that you have to resort to stealing it? Cmon man "let those who have talked to the elves, find each other and band together" -TMK
In a society in which nearly everybody is dominated by somebody else's mind or by a disembodied mind, it becomes increasingly difficult to learn the truth about the activities of governments and corporations, about the quality or value of products, or about the health of one's own place and economy.
In such a society, also, our private economies will depend less upon the private ownership of real, usable property, and more upon property that is institutional and abstract, beyond individual control, such as money, insurance policies, certificates of deposit, stocks, etc. And as our private economies become more abstract, the mutual, free helps and pleasures of family and community life will be supplanted by a kind of displaced citizenship and by commerce with impersonal and self-interested suppliers...
The great enemy of freedom is the alignment of political power with wealth. This alignment destroys the commonwealth - that is, the natural wealth of localities and the local economies of household, neighborhood, and community - and so destroys democracy, of which the commonwealth is the foundation and practical means.” - Wendell Berry
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DMT - Not yet
Posts: 88 Joined: 07-Sep-2013 Last visit: 14-Nov-2019
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The Day Tripper wrote:hdpe pipettes are fine for alcohols, so long as its just being used to transfer a solvent momentarily.
Limonene, however, will melt and eat away at hdpe.
If your unsure, its best to just use glass.
Glass pipettes really aren't that expensive, and a worthwhile investment. Hell, you might even have one lying around from a tincture bottle or something.
Its not worth the risk imho, for the cost of a glass pipette, or sep funnel. They really aren't that expensive, or hard to find/purchase.
And don't steal stuff from your school, glass pipettes, or even plastic pipettes, are not expensive. Just do it right, and act like an adult and buy your extraction equipment. Do you really need a pipette that bad that you have to resort to stealing it?
Cmon man Ok yes im sorry but they were just lying around and I took one becuase i knew i would need one instead going to look for one
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