Thioglycolate Salts in Perm Lotions, Explained
Thioglycolate chemistry powers both depilatory cream and cold wave/perm lotion — but the two products use it in almost opposite ways. Here’s how the family of salts fits into hair waving and straightening formulations.
Breaking Bonds to Dissolve Hair vs. Breaking Bonds to Reshape It
Depilatory cream and cold wave lotion both rely on thioglycolate salts breaking the disulfide bonds in keratin — but they’re solving completely different problems. Depilatory cream aims to fully dissolve the hair shaft. Cold wave lotion aims to temporarily loosen the hair’s internal structure just enough to reshape it around a roller, then lock the new shape in place with a neutralizer.
This difference in goal is exactly why the two product categories use different pH ranges, different salts, and different processing times — even though the underlying chemistry family is the same.
How Cold Wave / Perm Chemistry Works
Where Each Salt Fits in Hair Treatment Chemistry
| Salt | Primary Role | Perm Lotion Status |
|---|---|---|
| Ammonium Thioglycolate | Cold wave / perm lotion | Dominant / industry standard |
| Sodium Thioglycolate | Hair waving preparations | Secondary / specific formulations |
| Potassium Thioglycolate | Specialty hair treatments | Limited / niche use |
| Calcium Thioglycolate | Depilatory cream (primary) | Not the standard choice |
This table reflects general industry practice, not an exhaustive account of every formulation on the market. Specific product formulations vary by manufacturer.
Our Focus: Depilatory Cream, Not Perm Lotion
We manufacture calcium thioglycolate and formulate it into depilatory cream base — this is where the calcium salt is the standard, well-established active ingredient. We are not positioning calcium thioglycolate as a substitute for ammonium thioglycolate in perm lotion formulations; that would require dedicated formulation development we haven’t undertaken.
If you’re formulating a cold wave or perm product and researching the broader thioglycolate salt family, we hope this page is a useful reference — even though it’s outside our current product line.