Diacetyl, Acetyl Propionyl, and Acetoin in Flavorings with data - Blogs - E-Cigarette Forum
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Diacetyl, Acetyl Propionyl, and Acetoin in Flavorings with data

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by , 05-10-2014 at 07:27 PM (1561 Views)

There are more than 2,000 substances used in flavoring manufacturing. The FDA regulates flavorings to ensure they are safe when eaten. Many flavorings have been in longstanding use and are classified by the FDA as "Generally Recognized as Safe" (GRAS) to eat. Thus far, the FDA does not require testing for other routes of exposure, such as inhalation.

Some flavoring manufacturers are using alternative substances for diacetyl in formulating flavorings. These compounds are acetoin and acetyl propionyl. Like diacetyl, these are 'GRAS' substances that are approved for use in food. Their chemical structures are very similar to diacetyl and have been found to be equally as harmful for inhalation.

Companies are not required to report if their flavorings contain less than 1% of diacetyl or diacetyl substitutes (https://www.dir.ca.gov/title8/5197.html).

Two companies (FA and TFA) have shown that in quantities with less than 0.5%, 1000s of ppbs have been found, yet NIOSH recommends the exposure limit (REL) for vapor inhalation up to 8-31 ppb.

CDC - NIOSH flavorings exposure
OSHA- Diacetyl and Diacetyl Substitutes
FDA New Authority on E-cigarettes

Department of CA Diacetyl Report of Use
Diacetyl Standard Becomes Official - Cal-OSHA

FlavourArt Clearstream

TPA Spec Sheet and Components 513-86-0
TPA Spec Sheet and Components 600-14-6

IJ - Impact of Flavor Variability

VP LIVE - interview

Flavor and Manufactures Association Updated List April 28, 2014
FEMA flavor - Safety/Assesment/Regulatory Flavors (E-Cigarettes)
Perfumer/Flavorist Fema

Special thanks to we2rcool =)

Updated 06-24-2014 at 04:27 AM by RocketPuppy

Misc. Info


  1. Deeo's Avatar
    The way I see it is we still inhale these flavourings in food as we suck or chew. Am I wrong? Are these flavourings not in lollipops or sour candies , cough candies such as Vicks or Halls etc?
  2. RocketPuppy's Avatar
    Diacetyl isn't a toxin until it's heated. Once heated, the vapor produced becomes toxic.
  3. Deeo's Avatar
    Oh I see we'll lets hope that all ejuice companies stop using these.
  4. RocketPuppy's Avatar
    Hope so too!
  5. Sdh's Avatar
    Informative blog! Thanks RP!
  6. RocketPuppy's Avatar
    Please keep me apprised if I've missed anything or if anything needs updating.
  7. UserDave's Avatar
    thanks for this
  8. RocketPuppy's Avatar
    Of course! =)
  9. Satiated's Avatar
    It would be easier to see a list of the safe products so we could buy only those instead of looking at the list we shouldn't be using.
  10. RocketPuppy's Avatar
    Quote Originally Posted by Satiated
    It would be easier to see a list of the safe products so we could buy only those instead of looking at the list we shouldn't be using.
    I agree, but the list is constantly changing. However, there are threads in the diy section that keep up to date information. FlavourArt and The Flavour Apprentice are the only companies I know of who test for the most minute ingredients.
  11. Zelphie's Avatar
    Im not sure I understand. As far as Im aware FA did remove Diacetyl but the Clearstream Project was not related. Also, FA, as far as I know, never tested for or removed AP or Acetion. So how are people choosing which flavors to vape from FA? They list "vaping flavors" but those are not AP or Acetion free??

    The only one I know of is TFA who lists all 3 plus Butyric Acid.

    I love FA, so if I missed something please do direct me to info that I may have missed over the past few years.