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3. Control
3.1 Control methods
The structural parameters of high-density polyethylenes are measured using laboratory techniques of varying degrees of sophistication.
SCROLL TO TOPThe degree of crystallinity can be measured by differential thermal analysis, X-ray diffraction or infrared spectroscopy. Indirectly, density measurement provides an estimate of crystallinity. Routine checks focus on density measurement. This is carried out in accordance with NFEN ISO 1183. In most cases, density...
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Control
Properties
Bibliography
- (1) - PEACOCK (J.A.) - Handbook of Polyethylene – Structure, properties & applications. - MARCEL DEKKER INC. (2000).
- (2) - GRANN-MEYER (E.) - Polyethylene Pipes in applied engineering – Handbook. - TOTAL (2005).
Also...
Standards and norms
• The two main control standards (§ 3.1) used to distinguish the different grades of PE-HD according to their density and melt flow rate at 190 ˚C (MFR) are:
- Plastics – Methods for determining the density of cellular plastics – Part 1: Immersion method, liquid pycnometer method and titration method - NF EN ISO 1183-1 - 2004
- Plastics – Determination of the melt flow rate (MFR) and melt...
Regulations
NF 388 mark – Plastic tanks used for unburied storage of domestic heating oil in premises.
NF 114 mark – Polyethylene pipes for combustible gas distribution networks, drinking water distribution networks, irrigation and industrial applications, non-drinking water and pressurized wastewater systems.
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Petrochemical Market Dynamics Polyolefins. Report, july 2010
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Statistical and economic data
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European market
Aside from the impact of the 2009 crisis, PE-HD production in Europe will continue to decline as a result of the announced closure of certain production units. Western Europe continues to export mainly to Central European countries such as Hungary, Romania, the Czech Republic and Poland, the latter receiving the largest volume. Outside the...
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