rso - to dab or not to dab

budchemist said:

How are you extracting?
I'd be more worried about isopropyl alcohol residue than waxes if you are using iso.

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Fadedawg said:

RSO can be dabbed, though a little harsh. How are you purging the alcohol?

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wompaa said:

i don't purge it, is when you leave it on heat for 4hrs ? (don't know what or why to purge)


i just evaporate it in a slow cooker until it won't flame on a piece of metal so i know the alchols gone.


It's tasty shit and not too harsh

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Fadedawg said:

ISO is a FDA class three solvent, with the following residual FDA standards:

Solvents in Class 3 (Table 3) may be regarded as less toxic and of lower risk to human health. Class 3 includes no solvent known as a human health hazard at levels normally accepted in pharmaceuticals. However, there are no long-term toxicity or carcinogenicity studies for many of the solvents in Class 3. Available data indicate that they are less toxic in acute or short-term studies and negative in genotoxicity studies. It is considered that amounts of these residual solvents of 50 mg per day or less (corresponding to 5,000 ppm or 0.5 percent under Option 1) would be acceptable without justification. Higher amounts may also be acceptable provided they are realistic in relation to manufacturing capability and good manufacturing practice (GMP).

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wompaa said:

my mind is blown if i think this is what it means .... so iso is cool to use ?

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Fadedawg said:

As long as you purge it below FDA standards.

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wompaa said:

my mind is blown if i think this is what it means .... so iso is cool to use ?

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wompaa said:

are fda in uk ?

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budchemist said:

Personally I dont think isopropyl is safe to use unless you use a vacuum and even then you have to be careful. Fadedawg is correct that if you purge to below FDA standards you are safe. The challenge is that there is no way that a home extractor could determine the concentration of isopropyl alcohol.

You would also need to consider that most of the research on isopropyl alcohol focuses on inhalation from an occupational exposure perspective and not direct concentrated inhalation. Isopropyl alcohol is metabolized by the body to acetone and then to acetic and formic acid (if my memory is correct). Acetone is a nervous system depressant.

It is very difficult to remove solvent from an oil using heat alone. Excess heating also runs the risk of degredation of your THC and CBD.

My recommendation is to spend the extra money and purchase an oil vacuum pump. Robinair makes good quality pumps that hold up well as long as you regularly change the oil. If money is tight you can use a water faucet aspirator.

If you go down this path, the best way to blast is directly into round bottom flasks. I use a 500mL 24/40 1 neck round bottom (cheap on aliexpress). That way you can connect directly to the pump using a vacuum/inlet 24/40 gas adapter. Going this route is significantly less expensive (and better performance) than using a vacuum chamber.

My next run I plan on documenting my extraction with photographs.

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wompaa said:

iv' seen these on youtube, so you put your oil in here a vacuum it out ?

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Robinair 15510 VacuMaster Single Stage Vacuum Pump. The pump above is definitely a step up in terms of vacuum ability. A better pump is required when using a vacuum chamber as you do get a greater loss of vacuum because there is more places for the air to escape.

That being said the system will do a good job and keep you safe.

My preference for chemical glassware is due to my years as a research chemist. I admit I have a bias as I spent 15 years of my life using it.