Glossary PP
This glossary contains an overview of the most used terms in the polypropylenes business.
Searching our database can be done by using the text search. All relevant matches for your query will be returned.
Alternatively you can browse the terms starting with a specific letter you choose.
| Enter Name |
Alphabetical Search |
|
|
| D |
| Density |
Specific gravity. The mass of a material per unit volume, expressed (specific gravity) in kilogramms per cubic meter (kg/m) for solids and liquids.
The density of materials is temperature-dependent, as most materials expand when they are heated and shrink when they are cooled. The density of water is 1000 kg/m3 at a tempeture of 4°C. The density of plastics is measured according to the gradient method described in ASTM D 1505. A higher density will result in a higher stiffness. Plastics with a low degree of branching have a high density.
|
| Differential Scanning Calorimetry (DSC) |
In Differential Scanning Calorimetry (DSC) the sample and a reference material are heated and cooled in a defined manner. DSC provides a rapid method for the determination of the temperature profile of a polymeric material. This includes e.g. measurement of heat capacity, specific heat, melting, crystallisation and glass transition temperatures, heat (enthalpy) of fusion, crystallisation, study of thermal stability or reaction kinetics and in certain cases identification of the polymer or polymer mixture.
|
