Do these substances emit formaldehyde gas when heated?

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The discussion centers on concerns about whether cyclomethicone and glyoxylic acid emit formaldehyde gas when heated by hair straighteners or dryers. Cyclomethicone is widely used in various personal care products and is not expected to release formaldehyde under normal heating conditions. Glyoxylic acid, known for its strong odor and potential to irritate skin and respiratory systems, is acknowledged as a weak acid that could cause reactions. The inquiry about formaldehyde seems to stem from a negative reaction experienced during a keratin treatment application. Participants suggest that the substances are likely thermostable and that allergic reactions might be the cause of the symptoms experienced. Overall, the consensus leans towards the unlikelihood of formaldehyde release from these compounds when heated.
lk0306
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Hey there,

Trying to confirm whether or not these substances emit formaldehyde gas when subject to heat of hair straightener and hairdryers. Both were ingredients in a keratin treatment i used at home and i had a crazy reaction (irritated skin, eyes, hair, nose and lungs) in the process of heating in the application process.

- Cyclomethicone
- Glyoxylic acid
 
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Cyclomethicone - looking at the formula I'd say it was somewhat unlikely. It is in widespread use in hair products, deodorants, skin care products (and some other products as well) and it would not be used in hair products if a hairdrier caused it to release formaldehyde.

Glyoxylic acid is reported as having an obnoxious odour, and it can be an eye, skin and respiratory irritant - it is a weak acid, so that is to be expected.

Why did you mention formaldehyde anyway? Smell?

Given that there would likely be only small amounts of these in any hair treatment, why did you ask about this pair in particular?

I got the info within seconds using google, incidentally. It was easy to find.

And the above is just my opinion. I am not an expert on these compounds, just a normal chemist.
 
I agree with DrJohn.

It is possible you have allergies. The compounds appear thermostable so it's unlikely to be formaldehyde unless your heat gun belongs to Area 51.
 

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