Propylene Glycol USP grade is safe for human consumption, including inhalation. It is used as a germ killer in both solid and gas forms. It's in your prescription drugs. It's in your cosmetics and soaps. It's in your food. It's in your water. It's in tobacco products. It's used in fog machines. It's even in biodegradable antifreeze.
All the Material Data Safety Sheets I've found on PG only list a mild respiratory irritation when inhaled as a vapor.
Long term exposure is a different story. I haven't found anything on that, but the e-cig users who inhale PG vapors all the time don't report having any problems so far.
Added:
I found the medical resources on that question:
http://www.ncbi.nlm.nih.gov/pubmed/18158714
http://jpet.aspetjournals.org/content/91/1/52.abstract
Yes, propylene glycol is a humectant.
The chemical formula of propylene glycol is C3H8O2.
Propylene glycol can be made through a chemical process called hydration of propylene oxide, where propylene oxide reacts with water to form propylene glycol. This reaction is typically carried out in the presence of a catalyst, such as an acid or a base, to facilitate the conversion of propylene oxide into propylene glycol.
The weight of a liter of propylene glycol is approximately 1.036 kilograms.
No, propanediol and propylene glycol are not the same. Propanediol is a chemical compound with two hydroxyl groups, while propylene glycol is a chemical compound with one hydroxyl group.
Yes, Ethylene glycol and Propylene glycol are very similar chemically, therefore, can be mixed without any bad consequences for the engine.
Propylene glycol used to be in vehicle antifreeze.
Yes, propylene glycol is a humectant.
The chemical formula of propylene glycol is C3H8O2.
Propylene glycol has covalent bonds.
Propylene glycol can be made through a chemical process called hydration of propylene oxide, where propylene oxide reacts with water to form propylene glycol. This reaction is typically carried out in the presence of a catalyst, such as an acid or a base, to facilitate the conversion of propylene oxide into propylene glycol.
From www.fao.org/ag/agn/jecfa-additives/specs/Monograph1/Additive-360.pdf Propylene glycol alginate is an ester of alginic acid in which some of the carboxyl groups are esterified with propylene glycol, some neutralized with an appropriate alkali and some remain free.
The weight of a liter of propylene glycol is approximately 1.036 kilograms.
Propylene glycol in fireball
Propylene glycol is generally considered safer than ethylene glycol for use in coolant/antifreeze due to its lower toxicity. This makes propylene glycol a preferred choice for applications where accidental ingestion may occur, such as in RVs or marine engines. Additionally, propylene glycol is less harmful to the environment compared to ethylene glycol.
No, propanediol and propylene glycol are not the same. Propanediol is a chemical compound with two hydroxyl groups, while propylene glycol is a chemical compound with one hydroxyl group.
Most of them contain propylene glycol.