Alcohols & Glycols
REACH
2-butyne-1,4-diol
CAS Number
110-65-6
EC Number
203-788-6
Abbreviation
BYD
What is 2-butyne-1,4-diol?
2-Butyne-1,4-diol (CAS 110-65-6), also known as bis(hydroxymethyl)acetylene, is a bifunctional acetylenic diol used as a corrosion inhibitor, chemical intermediate, and stabilizer.
Where is 2-butyne-1,4-diol used?
- Metalworking and acid pickling baths: corrosion inhibitor
- Steel and iron surfaces: protection during descaling and cleaning
- Polymer and resin manufacture: monomer or crosslinking intermediate introducing acetylenic functionality into polyurethanes
- Polyesters and specialty coatings
- Textile and leather processing: stabilizer and preservative additive in treatment baths
- Electroplating formulations improve deposit quality and suppress unwanted oxidation.
Commercial specifications
- Concentrations commonly available at 35% and 98%+ for technical-grade applications
- Packaging typically ranges from drums to IBC totes depending on volume requirements
Other Names (Synonyms)
bis(hydroxymethyl)acetylene|1,4-dimethoxyacetylene|1,4-dihydroxy-2-butyne|But-2-yne-1,4-diol|1,4-BUTYNEDIOL|2-Butynediol|Agrisynth B3D|2-Butin-1,4-diol|BYD
What are the physical properties of 2-butyne-1,4-diol?
Melting Point 58 °C
Boiling Point 238 °C @ Press: 760 Torr
Density 1.2
Flash Point 306 °F
Appearance yellow solid
Color slightly brown
Form Crystalline Platelets or Flakes
Water Solubility 3740 g/L (20 ºC)
Vapor Pressure <0.1 mm Hg ( 55 °C)
Refractive Index 1.4804
pH 4-7.5 (100g/l, H2O, 23℃)
Log P -0.73 at 25℃
How is 2-butyne-1,4-diol classified and handled safely? Learn More
Danger
GHS05· Corrosive GHS06· Toxic GHS08· Health Hazard GHS07· Irritant
Hazard Statements
H301 Toxic if swallowed
H311 Toxic in contact with skin
H312 Harmful in contact with skin
H314 Causes severe skin burns and eye damage
Precautionary Statements
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P262 Do not get in eyes, on skin, or on clothing.
P264 Wash … thoroughly after handling.
Which trade and regulatory codes apply to 2-butyne-1,4-diol?
HS Code 29053980
UN Number 2716
ADR Class 6.1
Packing Group III
Storage Class 6.1C - Combustible acute toxic Cat.3
toxic compounds or compounds which causing chronic effects
WGK (Germany) 2