School of GeoSciences

Epoxy Resins

The withdrawal (2007) of the Ciba-Geigy resin Araldite MY 778 and Hardener HY 951 from the market has forced the Facility to re-look at the most suitable epoxy resins to use for Secondary Ion Mass Spectrometry (SIMS) analysis.

S. Engwell and M. Hall (2008)


Over 90% of the samples studied by the Facility are embedded in, or mounted with, one of the commonly available resins. Ideally, these resins should have a low viscosity, set quickly, set hard, be compatible at high vacuum and contain no element that will compromise the SIMS chemical or isotopic analysis. In addition, they should be suitable for petrological study, imaging (e.g. cathodoluminescence (CL), backscatter electron (BSE)) and electron micro-probe analysis (EPMA).

The following pages present the results from a variety of measurements on the commonly used resins, together with comments on their suitability and advice on sample preparation. Any additional information or comments concerning these, or other epoxy resins are welcome and should be addressed to the Ion-Microprobe Facility at There is also a fantastic web site by Epotek at that will answer all the questions you have about epoxy resins.

Epoxy Resins Tested: Buehler:

  • EpoThin
  • EpoHeat
  • EpoxiCure
  • TransOptic (not an epoxy resin, but a fine grained thermoplastic)
  • ProbeMet (not an epoxy resin, but an epoxy mounting compound with copper filler)
  • KonductoMet (not an epoxy resin, but a Phenolic mounting compound with graphite filler)


  • SpeciFix-20
  • EpoFix


  • Ciba Geigy MY 778 & HY 951
  • Robnor Resins PX771c (previously CY1301 & HY1300)
  • Korapox 439
  • Domestic Rapid-set Araldite (Partial Tests Only)
  • Domestic Araldite (Partial Tests Only)
  • Varian Torr Seal (Partial Tests Only)
  • Petropoxy