Methylpropanediol

Functions
Solvent
Solubilizer
Emulsifier
Moisturizer
Preservative booster
Pigment wetting agent
Penetration enhancer
CAS Number(s)
2163-42-0
EINECS number(s)
412-350-5
FDA UNII
N8F53B3R4R

Methylpropanediol (2-methyl-1,3-propanediol or MP diol) is a humectant glycol, a clear and colorless viscous liquid with a very low odor, used in personal care products and fragrances. Thanks to its excellent solubilizing and moisturizing properties, 2-methyl-1,3-propanediol is a good alternative to other glycols (Propylene, Butylene, DiPropylene, and Pentylene glycols), Glycerin, and Sorbitol.

MethylPropanediol can serve as an emulsifier with an HLB value of 8.9 with outstanding lubricating, skin feel, and synergy with Glycerin. It has good antimicrobial properties and acts as a safe preservative booster. In addition, 2-methyl-1,3-propanediol helps control the formulation's viscosity, saves energy processing in low temperatures, and wets pigments in decorative cosmetics. In perfume, it improves the spread of and enhances the fragrance. It can also serve as a penetration booster for other ingredients like AHAs and BHAs, speeding up adsorption and improving the formula's effectiveness.

Glyclols are frequently utilized in emulsion products to improve freeze/thaw stability. Test with MP diol-containing products showed the ability of a product to be frozen and then recover without product degradation in multiple cycles in a range of -20°C for twenty-four hours and 25°C for twenty-four hours. It prevents phase separation encountered using traditional glycols. Cosmetic products must exhibit adequate elevated temperature stability to be considered satisfactory to enter the marketplace. It is anticipated that ninety days at 45°C will approximate a shelf life of at least two years, and methylpropanediol will allow formulators to achieve those standards while producing the clearest products compared to traditional glycols.

Used in all types of skin, lip, nail, and hair care applications, MethylPropanediol is a multifunctional and eco-friendly ingredient that provides even distribution, prolonged moisturization, and better shelf life. Although it is a synthetic ingredient, the cosmetic Ingredient Review expert panel determines methyl-propanediol as safe for personal care products, tested for an extended period without significant adverse or sensitizing effects on the skin, hair, and nails.
Synonyms
2-methyl-1,3-propanediol
2-Methylpropane-1,3-diol
1,3-Propanediol, 2-methyl-

Ingredient products

MBR® Medical Beauty Research
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Biologique Recherche

Methylpropanediol is an isomer of 1,3-butylene glycol and offers similar performance characteristics. It has a broad solvency that helps enhance fragrances while giving clear, homogenous solutions.

Methylpropanediol is a low molecular weight glycol that does not contain chlorine compounds, ozone-depleting substances, or heavy metals and is not manufactured using them. It also has low volatility and a high flash point of 113°C.

Methylpropanediol showed no evidence for either target organ effects or bioaccumulation, even at repeated, high-level oral exposures. It also was not genotoxic, with or without activation.

Methylpropanediol is an ecologically safe ingredient that is biodegradable by aerobic microorganisms and exhibits low aquatic toxicity. The biodegradation products are carbon dioxide and water since it contains only carbon, hydrogen, and oxygen atoms. However, it is not classified as" readily biodegradable" but has been characterized as inherently biodegradable.