Overview
Chlorendic anhydride (CAS 115-27-5 ), also known as HET anhydride, is a halogenated cyclic anhydride used as a reactive flame retardant and curing agent in polymer systems.
Unlike additive flame retardants, it chemically incorporates into the polymer backbone, delivering durable fire resistance without migration or leaching during the product lifecycle.
In epoxy resin formulations for electrical laminates and printed circuit boards, it functions as a hardener that simultaneously imparts flame retardancy, reducing the need for separate additive packages.
Unsaturated polyester resins for construction panels, ducting, and marine components use this material to meet fire performance standards required in building and transportation applications.
Aerospace and defense composite manufacturers specify it where structural parts must satisfy stringent self-extinguishing or low flame-spread requirements for critical safety components.
It is also used in alkyd resin synthesis where halogen-based fire resistance must be built into the resin rather than applied as a coating, ensuring long-term material stability.
The product is supplied as an off-white to pale yellow crystalline powder or solid. Technical grade is the standard commercial form, with purity typically specified at 98% or higher.
Packaging is available in fiber drums or multi-wall bags suited for bulk industrial procurement. Proper storage in a cool, dry environment is recommended to maintain chemical integrity.
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Physical Properties
| Melting Point | 239 °C |
| Boiling Point | 486.58°C (rough estimate) |
| Density | 173 g/cm³ |
| Appearance | WHITE CRYSTALLINE POWDER OR CHUNKS |
| Color | White to Almost white |
| Form | powder to crystal |
| Water Solubility | insoluble |
| Vapor Pressure | 0-0.003Pa at 20-24.85℃ |
| Refractive Index | 1.5550 (estimate) |
| Log P | -1.59-1.39 at 20-25℃ |
Safety & Handling
Warning GHS07 GHS08 Hazard Statements H315 Causes skin irritation H317 May cause an allergic skin reaction H319 Causes serious eye irritation H335 May cause respiratory irritation H351 Suspected of causing cancer H373 May causes damage to organs through prolonged or repeated exposure H412 Harmful to aquatic life with long lasting effects Precautionary Statements P203 Obtain, consult and follow expert instructions for use. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P271 Use only outdoors or in a well-ventilated area. P272 Contaminated work clothing should not be allowed out of the workplace. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P318 IF exposed or concerned, get medical advice. 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. P333+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. 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+P351+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
- 115-27-5
- EC Number
- 204-077-3
- Mol. Weight
- 370.8
- HS Code
- 29172090
- Category
- Monomers & Building Blocks