Final polishing should use 0.25 micron abrasive
Samples with porosity should be vacuum-impregnated with resin to fill void space
Thin sections: 45-48mm long, up to 25mm wide, 1mm thick with up to 0.5mm thick polished sample above the glass slide
Disks: 25.5mm or 29.5mm diameter, thickness 5-25mm
It may be possible to accommodate other formats - please discuss details with Chris Hayward
Lakeside, Canada Balsam and styrene-based resins must not be used for preparation.
Samples should arrive at the laboratory 2 days before the EPMA session for coating
Samples must be cleaned after polishing and before carbon coating to remove traces of abrasive particles and lubricants. This is done at Edinburgh using petroleum spirit.
A method for the preparation of micro- and cryptotephras, developed by Mike Hall at Edinburgh, will shortly be published in the Geological Society Special Publication on Marine Tephras (Hall and Hayward, in press).
Please discuss any queries related to sample preparation or format with Chris Hayward well in advance of your scheduled EPMA booking
Potential users are strongly encouraged to discuss the sample preparation with TAU Staff prior to arrival. Grinding, polishing and carbon coating facilities are available within the Tephra Analysis Unit.