NIKK Knowledge Base: H
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Hardness
The resistance against penetration of a hard object, e.g. metal ball or needle, is called hardness of a material.
Heat resistance
The heat resistance of a polymer is defined as the maximum admissible temperature for practical use. There are different measurement methods available: Martens, Vicat and HDT according ISO /R 75.
Often the Vicat temperature is used as the maximum admissible temperature for plastic components.
Heat transition coefficient
The heat transition coefficient is a measure of the thermal isolation behaviour of a material.
Hexene
Hexene is a hydrocarbon compound with 6 carbon atoms: C6H12. Hexene was used as a copolymer e.g. in polyethylene (PE100).
High voltage testing
For the quality tests of a weld a high voltage and high frequency test instrument is used. By means of this test procedure bubbles or cavities could be found.
Hydrolysis
Hydrolysis is a chemical process in which a water molecule reacts with a substance resulting in the split of that substance into two parts. Hydrolysis was e.g. used in the waste water industry to split big organic substances into smaller parts (e.g. sugar, acids or alcohols) so bacteria’s could handle these parts.
Hygroscopy
Hygroscopy is the ability of materials or surfaces to attract or hold water molecules from the surrounding atmosphere or water. Thermoplastic polymers are normally not hygroscopic but due to different additives polymers could attract water.
But the amount of water uptake is under 1% at normal atmosphere.
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