Using HairPLEX™ in leave-in and rinse-off hair formulas
Asked by: testwork168168
On: June 05, 2026
Product Type:
Cosmetics
Answered
Question
Can this substance be added to a leave-in formula?
- If it can be added, will its effectiveness decrease over time?
Can this substance be added to Rinse off formulas such as treatment, shampoo and left on, or does it have to be mixed only specifically for use with treatment or shampoo?
Can it be used every day, or as often as needed?
Answer
For HairPLEX™ (Bis-Aminopropyl Diglycol Dimaleate):
Leave-in formula
- It can be mixed into water-phase formulas because the product is water-soluble and can be used within pH 3-9.
- However, the catalog’s main recommended applications are intensive hair treatment / conditioner / chemical-service protection systems, where the product is left on hair for at least 15 minutes before rinsing.
- For a leave-in product, use is possible from a formulation standpoint, but the finished product should be stability-tested, and the dosage should usually be kept lower than intensive rinse-off/treatment use to avoid sticky feel, buildup, or heaviness.
- Efficacy should not suddenly disappear just because it is in a leave-in format, but performance over time depends on finished-formula stability, pH, storage, packaging, and compatibility with other ingredients. For finished products, confirm by stability testing. Store away from heat/light.
Rinse-off formulas such as treatment or shampoo
- Yes, this is the main recommended use style.
- HairPLEX™ may be mixed with treatment/conditioner or water-based systems. Catalog guidance recommends leaving on hair at least 15 minutes for full effect; shorter contact time may reduce performance.
- For shampoo, it can be formulated in, but because shampoo has short contact time and is rinsed quickly, bond-care performance may be lower than in a treatment/conditioner that is left on for 15 minutes or more.
- It is not limited only to “mix immediately before use”; it may be included in a finished formula, but the finished formula must be checked for stability, pH, preservation, and compatibility.
Frequency of use
- It can generally be used daily or as often as needed if the finished product is mild and suitable for the scalp/hair.
- Practical recommendation: use more frequently when hair is damaged from bleaching/coloring/perm/straightening; reduce frequency if hair feels heavy, coated, dry, stiff, sticky, or scalp irritation occurs.
Typical catalog usage range: 5-30%. For conditioner/treatment, the catalog recommends around 20-25%; for milder leave-in products, start lower and test the sensory feel and stability first.
