5. Product control
5.1 Expandable polystyrene
Molecular weights are generally measured by gel permeation chromatography (GPC), and pentane and residual styrene monomer contents by gas chromatography. Granulometry is controlled using sieves.
These physico-chemical measurements are not enough, and it is necessary to transform the product (pre-expansion and molding) to determine its actual behavior.
This is achieved using small-scale equipment. In this way, for example, the bulk density obtained under given expander setting conditions can be determined. Similarly, a cycle time can be checked during the molding phase, followed by a given physical property of the molded product.
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...Economic data
The global EPS market totalled 3.75 million tonnes in 2004, of which 46% was used in packaging.
The breakdown of the insulation and packaging markets varies from one continent to another. These are entirely representative of building traditions (whether or not to insulate) and the importance of industries using EPS packaging. In Japan, for example, a leader in the electronics sector and the world's...
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