Overview
Hexahydrophthalic anhydride , commonly abbreviated as HHPA, is a cycloaliphatic anhydride used as a curing agent and reactive intermediate across epoxy and polyester systems. Its saturated ring structure makes it a preferred choice over aromatic anhydrides.
This chemical, identified by CAS 85-42-7 , is valued where UV stability and color retention are procurement priorities. It is a primary hardener for epoxy resin systems in electrical encapsulation and casting compounds.
In powder coatings, it delivers long pot life and controlled cure profiles. In alkyd and polyester resin synthesis, it functions as a monomer building block, contributing to resins used in industrial coatings and can coatings.
Adhesive and sealant formulators use this material to tune flexibility and adhesion in structural bonding applications. It also appears as a reactive modifier in specialty plasticizer production for polymer matrices.
Its cycloaliphatic backbone improves compatibility with PVC and other materials. The product is supplied as a low-melting solid or liquid, depending on isomer composition and temperature during the handling process.
It is typically handled and shipped in molten form for industrial volumes. Standard commercial grades are available at high purity for resin and coating applications, ensuring consistent performance in manufacturing.
Technical grade material is the predominant market form for industrial use. No food or pharmacopoeial grades like FCC , USP , Ph.Eur. , BP , EP , or ACS are standard for this specific product.
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Physical Properties
| Melting Point | 32 °C |
| Boiling Point | 146 °C @ Press: 15 Torr |
| Density | 1.18 |
| Flash Point | >230 °F |
| Color | White to Off-White |
| Form | Solid |
| Water Solubility | 4.2g/L at 20℃ |
| Vapor Pressure | 0.31Pa at 25℃ |
| Refractive Index | 1.4620 (estimate) |
| Log P | -4.14 at 20℃ |
Safety & Handling
Danger GHS05 GHS08 GHS07 Hazard Statements H317 May cause an allergic skin reaction H318 Causes serious eye damage H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled H335 May cause respiratory irritation H336 May cause drowsiness or dizziness Precautionary Statements P233 Keep container tightly closed. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. 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. P284 In case of inadequate ventilation wear respiratory protection. P317 Get emergency medical help. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P403 Store in a well-ventilated place. 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. P333+P317 Get emergency medical help. P342+P316 Get emergency medical help immediately. 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 | 29172090 |
| Storage Class | 11 - Combustible Solids |
| WGK (Germany) | 1 |
Other Names
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Chemical Properties
- CAS Number
- 85-42-7
- EC Number
- 201-604-9
- Mol. Weight
- 154.16
- HS Code
- 29172090
- Category
- Flavors & Fragrances