 | Haze | | A degree of cloudiness in a plastic material. |
| HD | | High Durability |
| Heat Activated | | To soften a dried thermo-plastic adhesive film to a sticky stage by application of heat. After bringing the adhesive to its melting point, the process of bonding can then take place. |
| Heat Aging | | A controlled environment to provide an indication of any deterioration of an end use or finished product. |
| Heat Resistance | | Property of a material which inhibits the occurrence of physical or chemical changes caused by exposure to high temperatures. |
| HG | | High Gloss |
| High Temperature Adhesive | | An adhesive that will enable a pressure-sensitive label to adhere or stick well when applied to a hot substrate and has a high degree of resistance to aging or deterioration at elevated temperatures. |
| Holding Power | | The ability of a tape to resist slippage under shear stress. Usually measured by applying a standard area of tape to a vertical test panel and suspending standard weight on the free end of the tape. |
| Hot Melt | | A pressure-sensitive adhesive applied to the liner or backing in a hot molten form which cools to form a conventional pressure-sensitive adhesive. |
| Hot Stamping | | A decorating process in which the desired image is transferred to a substrate by a heated, positive copy die. Images are normally limited to one color positive copy line. |