12BG (1,2-butanediol) is a glycol with hydroxyl groups on the first and second carbon of the 4-carbon chain. It can react with a dicarboxylic acid (for example phthalic acid or adipic acid), for use as a polyester polyol or a plasticizer. Moreover, it is also possible to make it react with an unsaturated dicarboxylic acid (for example, maleic anhydride) for use as an unsaturated polyester resin raw material.

  • CAS: No. 584-03-2 (T)
  • EINECS: No. 209-527-2
  • Japan, Chemical Substances Control Law: METI-No. 2-235
  • Japan, Industrial Safety and Health Law: No. 2-235
  • Japan, Poisonous and Deleterious Substances Control Law: Not applicable.
  • Japan, Fire Services Law: Hazardous material Class 4 Petroleums No.3 (water-soluble liquid).




Common Names 1,2 Butanediol
1,2-Butylene Glycol
Structure 12BG
CAS No. 584-03-2
Japan, Chemical Substances Control Law METI-No. 2-235
Japan Poisonous and Deleterious Substances Control Law Not applicable
Japan, Fire Services Law Hazardous material Class 4 Petroleums No.3 water-soluble Hazardous Rank III
Molecular Weight 90.1
Appearance Colorless to pale yellow liquid
Odor Acetic acid smell
Specific Gravity (25/4℃) 1.002
Viscosity(mPa・s) 38(at 20℃)
Boiling Point (℃) 193
Freezing Point (℃) -42
Flash Point (℃) 110 (Cleveland open cup)
Autoignition Temperature (℃) 394
Vapor pressure (kPa) 0.0027(at 20℃)
Heat of Vaporization (kJ/mol) 61.3 (at boiling point)
Heat capacity (kJ/kg・K) 2.404(at 20℃)
Thermal conductivity (W/m・K) 0.2105(at 20℃)

Since 1982, Mitsubishi Chemical's Yokkaichi plant has produced 14BG along with 12BG from butadiene using our proprietary technology.



12BG shows outstanding characteristics as a raw material for use as polyester plasticizers (for vinyl chloride resin), polyester polyols (soft segment of urethane resin), and unsaturated polyester resins. These products find a wide range of applications from everyday consumer products to industrial materials used in electric cars. 
It is anticipated that the use of these products will continue to expand.

Main Applications

  • Vinyl Chloride Resin Plasticizers
    A non-migrating plasticizer can be made by reacting with an aliphatic diacid such as adipic acid to form a low molecular weight polyester which subsequently undergoes esterification with an aliphatic alcohol like hexanol.

  • Polyester Polyol for Urethane Resins
    Polyols for urethane resins can be made by reacting with either an aliphatic diacid such as adipic acid or with an aromatic diacid such as phthalic acid at the terminal hydroxyl group to form a low molecular weight polyester polyol.  The urethane resin made from this material has excellent physical properties.

  • Unsaturated Polyester Resins
    By reacting with unsaturated aliphatic dibasic acids such as maleic acid or its anhydride and aromatic dibasic acids such as phthalic acid, a polyester resin can be made.  This unsaturated polyester resin may be used by dissolving it with a polymerizable monomer such as styrene.
    Because 12BG has an ethyl group, solubility in the polymerizable monomer is improved.  This facilitates treatment and results in a highly water-resistant resin

  • Various Other Polyester Raw Materials
    It can be used as a raw material for adhesive resins, etc.

  • Other Applications
    It can be used as a solvent, coolant, refrigerant, hydraulic fluid, or fine chemical raw material.

    Storage and Handling

    12BG is hygroscopic and will be degraded by oxygen, so the storage container should be sealed with dry nitrogen.  It is recommended that storage be at less than40℃.  12BG is classified under the Japanese Fire Services Act as a hazardous material, Class 4, Petroleums  No.3, water soluble, Hazardous Rank III.
    Volatility is low, and 12BG is unlikely to catch fire by itself at room temperature.  However, in case it is burning, dry chemical, foam (alcohol resistant), or large amounts of water are effective.  12BG has relatively low toxicity and is a relatively safe chemical.  When handling, however, protective equipment such as protective gloves and goggles should be worn.



Product Specifications

Item Specification
Hue (Hazen) <50
Moisture (%) <1
Purity (%) >80
Monoester (%) Balance
Diester (%) Balance
Acid Value (mgKOH/g) <1

Esters are acetates.

Available Quantities

Tanker Truckload (Lorry) 10ton / 13ton
Drum 200kg

Inquiries Concerning Products

Mitsubishi Chemical Corporation
C4 Derivatives Unit

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