Overview
Hydroxypivalic acid (CAS 4835-90-9 ), commonly abbreviated as HPA, is a bifunctional organic acid used as a reactive building block in polymer synthesis and resin formulation.
Its combination of hydroxyl and carboxyl groups makes it a practical monomer for producing specialty polyesters and alkyd resins. Oxypivalic acid is an alternative name occasionally encountered in trade.
In coatings, HPA is used to synthesize hydroxyl-functional polyester resins that crosslink with isocyanates or melamines, delivering improved hardness and weatherability in automotive and industrial finishes.
Alkyd resin producers incorporate it to control molecular weight and introduce branching, directly influencing viscosity and drying performance in the final coating applications.
In adhesives and sealants, HPA-derived polyesters contribute flexibility and adhesion to demanding bonding applications. Pharmaceutical manufacturers use it as a chiral intermediate for synthesis.
It serves as a building block for active pharmaceutical ingredient synthesis. Hydroxypivalic acid is supplied as a white crystalline solid or powder for various industrial processes.
It is available in technical grade for industrial resin and polymer applications, with pharmaceutical-grade material offered where API synthesis requires tighter purity specifications.
Standard packaging ranges from small drums to bulk quantities depending on application volume. This versatile chemical ensures high performance across multiple manufacturing sectors.
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Physical Properties
| Melting Point | 124 °C |
| Boiling Point | 156-159 °C @ Press: 25 Torr |
| Density | 1.221 g/mL at 25 °C(lit.) |
| Flash Point | >230 °F |
| Color | White to Almost white |
| Form | powder to crystal |
| Water Solubility | Soluble in water. |
| Vapor Pressure | 0.446Pa at 25℃ |
| Refractive Index | n 20/D 1.5215(lit.) |
| Log P | -0.02 |
Safety & Handling
Danger GHS05 GHS07 Hazard Statements H315 Causes skin irritation H318 Causes serious eye damage H335 May cause respiratory irritation Precautionary Statements P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P271 Use only outdoors or in a well-ventilated area. P280 Wear protective gloves/protective clothing/eye protection/face protection. P317 Get emergency medical help. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P332+P317 Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. 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 | 2918.19.9000 |
| WGK (Germany) | 1 |
Other Names
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Chemical Properties
- CAS Number
- 4835-90-9
- EC Number
- 225-419-8
- Mol. Weight
- 118.13
- HS Code
- 2918.19.9000
- Category
- Organic Acids