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INCI Name: Butyl Stearate
Product Code: 0029
CAS #: 123-95-5
EINECS: 204-666-5
Brand: HallStar®

HallStar® BST-COS is a low viscosity, low color and low odor emollient ester prepared from vegetable-derived triple-pressed quality stearic acid and n-butanol. It imparts a light smooth feel to skin, and its broad co-solubility make it useful as an emollient in a wide variety of personal care products and as a plasticizer and superfatting agent in nail care products.

Features & Benefits:

  • Biodegradable
  • Pigment Wetter & Dispersant
  • Resin Plasticizer
  • Solubilizing Agent
  • Superfatting Agent
Appearance Clear pale yellow liquid
Odor Mild, bland, characteristic
Acid Value (mg KOH/g) 0.5
Color (APHA = PtCo) 15
Saponification Value (mg KOH/g) 172
Refractive Index (25°C) 1.442
Iodine Value (gI2/100g) 0.5
Specific Gravity (25°C/25°C) 0.86
Water [Moisture] (%) 0.05
Insoluble In
  • Water
Soluble In
  • Cosmetic Esters
  • Fatty Alcohols (molten)
  • Mineral Oil
  • Silicones
  • Vegetable Oil
Toxicology Profile
  • CIR Expert Panel: Butyl Stearate is safe as used at levels of up to 25%. See JACT 4(5):107-46, 1985, for additional information.
  • Other: Butyl Stearate is used in flavors (FEMA No. 2214, JECFA No. 184), further attesting to its safety. The ACGIH TLV for airborne Butyl Stearate is 10 mg/m3 TWA (listed as Stearates).
  • Drum - 385lbs

Regional Approvals:

  • Australia
  • Canada
  • China
  • Japan
  • Korea
  • New Zealand
  • Philippines
  • Taiwan
  • US


  • Antiperspirants
  • Bar Soaps
  • Bath Additives
  • Deodorants
  • Depilatories
  • Eye Area Color Cosmetics
  • Facial Color Cosmetics
  • Facial Skin Care
  • Hair Colorants
  • Hair Conditioners
  • Hand & Body Care
  • Lip Care
  • Liquid Handsoaps
  • Nail Care
  • Shaving Products
  • Shower Gels/Body Washes
  • Styling Aids


Scroll right to view specs →
Name Regional Acceptance  Formula Number
Even Better Face and Neck CreamAustralia, Canada, EU, Japan, Korea, US145-21-02C

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The information presented herein is believed to be accurate and reliable, but no warranty or guarantee, expressed or implied, is made regarding the information or the performance of any product. Further, nothing contained herein shall be taken as any inducement or recommendation to use, manufacture or sell that may infringe any patents or any other proprietary rights now or hereafter in existence, nor to imply compliance with any regulatory requirements

The Hallstar Company - 120 South Riverside Plaza Suite 1620 - Chicago, IL 60606-3911 USA