In order to change the properties of plastics additives are used during compounding.
Additives are auxiliaries which influence the properties of the plastic granules during processing or the usage of the plastic part.
A distinction is made in reinforcing agents, functional additives and fillers.
Reinforcing agents are e.g. Fibers. Glass or carbon fibers are used to improve the mechanical properties. They increase the strength and rigidity of the components.
Functional additives are e.g. heat stabilizers, impact modifiers, UV stabilizers and processing aids. In general a few percent of the additive result in specific properties.
Fillers e.g. chalk or talc are usually inexpensive additives that reduce the price of the plastic granules.