Overview
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 across metalworking and polymer industries.
Its two reactive hydroxyl groups flanking a triple bond make it a valued building block for synthesis and surface protection applications. In metalworking and acid pickling baths, it functions as a corrosion inhibitor.
This compound protects steel and iron surfaces during descaling and cleaning operations. Polymer and resin manufacturers use it as a monomer or crosslinking intermediate to introduce acetylenic functionality into polyurethanes.
It is also utilized in polyesters and specialty coatings. In textile and leather processing, it acts as a stabilizer and preservative additive in treatment baths, helping to extend bath life and protect substrates.
Electroplating formulations also incorporate it to improve deposit quality and suppress unwanted oxidation during plating processes. This versatile chemical is supplied as a liquid or aqueous solution for various uses.
Concentrations are commonly available at 35% and 98%+ for technical-grade applications. Technical grade is the standard commercial specification for industrial corrosion inhibition and synthesis use.
Packaging typically ranges from drums to IBC totes depending on volume requirements. This ensures safe handling and efficient transport for large-scale industrial operations and chemical manufacturing facilities.
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Physical Properties
| 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℃ |
Safety & Handling
Danger GHS05 GHS06 GHS08 GHS07 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 H317 May cause an allergic skin reaction H318 Causes serious eye damage H331 Toxic if inhaled H335 May cause respiratory irritation H370 Causes damage to organs H372 Causes damage to organs through prolonged or repeated exposure H373 May causes damage to organs through prolonged or repeated exposure 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. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P272 Contaminated work clothing should not be allowed out of the workplace. P280 Wear protective gloves/protective clothing/eye protection/face protection. P316 Get emergency medical help immediately. P317 Get emergency medical help. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P330 Rinse mouth. P363 Wash contaminated clothing before reuse. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P316 Get emergency medical help immediately. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P308+P316 Get emergency medical help immediately. P333+P317 Get emergency medical help. P361+P364 Take off immediately all contaminated clothing and wash it before reuse. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P301+P330+P331 Rinse mouth. Do NOT induce vomiting. P302+P361+P354 IF ON SKIN: Take off immediately all contaminated clothing. Rinse skin with water/shower. P305+P354+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| 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 |
Other Names
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Chemical Properties
- CAS Number
- 110-65-6
- EC Number
- 203-788-6
- Mol. Weight
- 86.09
- HS Code
- 29053980
- Category
- Alcohols & Glycols