| Abbreviation | Definition |
|---|---|
| HFP | HexaFluoroPropylene |
| HFP | High Flow Polymer |
| HIPS | High Impact Polystyrene |
| HLH | Hypoplastic Left Heart |
| HMDI | Hexamethylene Diisocyanate |
| HMHDPE | High Density High Molecular High Density Polyethylene |
| HMHDPE | High Density & High Molecular High Density Polyethylene |
| HNBR | Hydrogenated Nitrile Butadiene Rubber (Acrylonitrile-Butadiene Rubber) |
| HPAS | High Performance Adhesive System |
| HQRP | High Quality Refined Plastic |
| HRE | Rockwell E Hardness Number |
| HRM | Rockwell M Hardness Number |
| HRR | Rockwell R Hardness Number |
| HTE | High Temperature Elastomer |
| HVAR | High Voltage Arc Resistance to Ignition |
| HVTR | High Voltage Tracking Rate |
| HWI | Hot Wire Ignition |
| IBS | Interactive Blowing System |
| IIR | Butyl Rubber |
| IM | Injection Molded |