Glossary PP
This glossary contains an overview of the most used terms in the polypropylenes business.
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Alphabetical Search |
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| A |
| Abrasion |
Scratch resistance
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| Abrasive (wear) |
Loss of polymer material by friction
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| Absorption (of light) |
Light transmission
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| Abuse resistance |
Resistance of a polymer to physical damage by rought treatment
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| Additives |
Substances added to base materials such as plastics in small quantities during manufacturing or processing, ususally with the aim to alter properties. Examples, anti-oxidant, heatstabiliser, plasticiser, processing aid.
An additive may be essential for obtaining the end product (e.g. processing aids), or it may be added to obtain certain properties in the end product (e.g. a UV-stabiliser)
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| Adhesion |
The phenomenon of two different materials being held together by physical attachment of their surfaces.
Adhesion usually has a more permanent character than cling and blocking.
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| Amorphous |
Having an undifferentiated, non-crystalline structure.
All liquids and glasses are amorphous, high molecular weight polymers and rubbers also lack a definite crystal structure and a well defined melting point: they are considered to be high-viscosity liquids. Macromolecules never can be made completely crystalline, but only partially: small crystalline areas exist in an amorphous structure. Slow cooling of the melt promotes crystallinity. Crystallinity also refers to the volume percentage of the crystalline phase.
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| Antioxidant |
An organic compound added to e.g. plastics, to retard deterioration caused by oxidation (ISO) (during processing).
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| Antistatic agent |
Substance that minimizes accumulation of electrostatic charges during processing or end-use of e.g. plastic sheeting
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| ASTM |
Adhesion = the state in which two surfaces are held together by interfacial forces.
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