Image icon  Thermoset case of an electrical plug

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Description: The microstructure revealed by the dye consists of seams of filler material (flour or wood-pulp) which is introduced to the melt in a 2:1 ratio part way through the moulding process. Urea thermosets are used because they are hard, inexpensive, and have good resistance to electrical arcing. An additional benefit of a thermoset as opposed to a thermoplastic in this application is that should a failure occur, it will fail in a safe mode (charring, but retaining it form, rather than melting).
Keywords: electrical • formaldehyde • injection moulding • network • plug • polymer • thermoset • urea • urea formaldehyde
Categories: Science approaches > Microstructure
Materials > Polymers & elastomers > Plastics > Thermosets
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: DoITPoMS, University of Cambridge
J A Curran, Department of Materials Science and Metallurgy, University of Cambridge
Published by: DoITPoMS, University of Cambridge
License: This resource is released under the Creative Commons Attribution Non-Commercial Share Alike license (2.0 UK: England & Wales).
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Date created: 03 October 2002
Date added: 21 August 2009
Resource ID: 1628