| Abbreviation | Definition |
|---|---|
| HCN | Hydrogen Cyanide |
| HCOOH | formic acid |
| HCR | High Chemical Resistance |
| HCSI | Halliburton Chemistry Scoring Index |
| HCSR | Hazardous Chemical Substances Regulations |
| HCT | HydroChloroThiazide |
| HCVD | Halide Chemical Vapor Deposition |
| HCVD | Hybrid Chemical Vapor Deposition |
| HCVD | Hydride Chemical Vapor Deposition |
| HCVD | Hydride Chemical Vapour Deposition |
| HCW | Household Chemical Waste |
| HDA | Hydroxy Decanoic Acid |
| HDCT | Higher Diploma in Chemical Technology |
| HDDMA | HexaneDiolDiMethAcrylate |
| HDI | Hexamethylene Di Isocyanate |
| HDL | high density lipoprotein |
| He | Helium |
| HEC | High-Elongation Carbon |
| HED | Hot Electron Death |
| HEDP | 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid |