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Hand Lay-Up
A fabrication method in which reinforcement layers are placed in mold by hand, saturated with resin and then cured to the formed shape.

Hardener
A substance or mixture added to a plastic composition to promote or control the curing action by taking part in it.

Honeycomb
Lightweight, cellular structure made from either metallic sheet materials or non-metallic materials (e.g., resin-impregnated paper or woven fabric) and formed into hexagonal nested cells, similar in appearance to the cross section of a beehive, that serves as a core material in sandwich constructions. Honeycomb may also be metallic or polymer materials in a rigid, open-cell structure.

Hybrid
A composite laminate comprised of laminae of two or more composite material systems, e.g., graphite and glass. It also applies to woven fabrics having more than one type of fiber.