12 PPM Butane / Propane in MA

That’s wild…pentane exposure limit (PEL) is 1,000 ppm averaged over an 8-hour workshift, heptane is like 500ppm over the same amount of time.

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I would imagine that back filling with propane once purged of the mass of butane can help as a volitile gas sweep
The propane will fight harder than the butane to escape the solution (paste)
And maybe takes butane for the ride along
Something like steam distillation where the steam distill compounds with a higher bp than the steam it self
No idea if it would work thou
What’d the ppm required with iso-pentane ?
Be nice to find an azeotrope gas for this riddle DME ?
Sadly when playing with gasses
Measuring content of final product was not available so I have very little insight

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Propane

https://www.google.com/url?sa=t&source=web&cd=&ved=2ahUKEwi_7P69nJKGAxUOhYkEHX4nAdMQFnoECA0QBg&url=https%3A%2F%2Fnj.gov%2Fhealth%2Feoh%2Frtkweb%2Fdocuments%2Ffs%2F1594.pdf&usg=AOvVaw0-NZzHMdEIEHKxzquvqorR&opi=89978449

: HAZARD. OSHA: The legal airborne permissible exposure limit (PEL) is 1,000 ppm averaged over an 8-hour workshift. NIOSH: The recommended airborne exposure limit (REL) is 1,000 ppm averaged over a 10-hour workshift. ACGIH: The threshold limit value (TLV) is 1,000 ppm averaged over an 8-hour workshift.

Isobutane

NIOSH: The recommended airborne exposure limit (REL) is 800 ppm averaged over a 10-hour workshift. ACGIH: The threshold limit value (TLV) is 1,000 ppm (as Aliphatic hydrocarbon gases) averaged over an 8- hour workshift.

https://www.google.com/url?sa=t&source=web&cd=&ved=2ahUKEwjHqa_unJKGAxX-g4kEHYeXDAQQFnoECA4QBg&url=https%3A%2F%2Fnj.gov%2Fhealth%2Feoh%2Frtkweb%2Fdocuments%2Ffs%2F1040.pdf&usg=AOvVaw21R8o-zP1F5nQGQ_2CQ6rF&opi=89978449

Butane

800 ppm
NIOSH: The recommended airborne exposure limit (REL) is 800 ppm averaged over a 10-hour workshift.

https://www.google.com/url?sa=t&source=web&cd=&ved=2ahUKEwjz6eWPnZKGAxVTlYkEHTKHDN8QFnoECA4QBg&url=https%3A%2F%2Fnj.gov%2Fhealth%2Feoh%2Frtkweb%2Fdocuments%2Ffs%2F0273.pdf&usg=AOvVaw3ysW7_y7-z30m566-BPJ04&opi=89978449

Well then people gotta be rexing their shit in pentane and using that to grow stones.

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I just noticed that link showing 12 ppm limits on C3 and C4s has a lengthy footnote citing the base for their limitations is information from the Commission of the European Communities, Scientific Committee on Food generated in 1999. What ? From where? When? They may as well have cited some drawings from ancient Egypt translated using the Rosetta Stone. The fine print reads:

“The upper limits are based on residual solvent recommendation by the Commission of the European Communities, Scientific Committee on Food (SCF, 1999). SCF has evaluated propane, n-butane and iso- butane as extraction solvents and determined that a residue level of 1mg of residual hydrocarbon per kg of food consumed is safe. The SCF evaluation suggests that these hydrocarbons are typically present in prepared foods in amounts less than 0.1 mg/kg. After careful review of the SCF assessment, MDPH has adopted a level of 1 mg/kg (or 10 times the background level of 0.1 mg/kg) as a health-protective residual solvent limit for cannabis oil.”

I’ve got a couple pressing matters to deal with this morning, but might look into this a little further as time permits. Off the topic of this thread, but dealing with solvent purity, one of those matters I’m addressing today involves purity issues with n-butane new supplier bringing into the industry. The manufacturer is claiming purity of 99.8% and touting a 3rd party analysis to confirm the claim. Long story short is last year we bought a cylinder from them and had it sent directly to 3rd party lab for testing revealing a whopping 95.81% purity. If you are approached by a salesperson offering product from a new source, delivered product at an unbelievably low price, recognize that the product doesn’t come close to meeting any state’s minimum standards for solvent purity. Get your solvent tested, get your solvent tested, get your solvent tested.

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Verified that Mass set a scant level of 12 ppm by the National Library of Medicine.

“California’s Bureau of Cannabis Control has set a residue limit of 5,000 ppm for both solvents in the final product,16 which is the same limit that the USP assigns across the board to its list of 26 “less toxic” solvents. The limit in Massachusetts is a scant 12 ppm.17 And Colorado’s Marijuana Enforcement Division initially set its limit at 800 ppm, bumped it up to 5,000 ppm a few years later,18 and settled on 1,000 ppm in 2018.19,20

It could seriously be that Massachusetts, is trying to be all hipster capture all the flavors and terps matter more than anything else and we only sell the most recent strains kind of state.

Wicked over commericalized and wicked vertically integrated.

It’s terp sauce state.

Could just be a conspiracy to keep butane, isobutane and propane concentrates out of Massachusetts.