School of GeoSciences

The Results

The Facility recommends the use of EpoxiCure, SpeciFix-20 or EpoFix for SIMS analysis

Summary

Ideally, the 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, it should be suitable for petrological study, imaging (e.g. cathodoluminescence (CL), backscatter electron (BSE)) and electron micro-probe analysis (EPMA). No resin meets all these requirements.

The table below presents a star rating, culminating in an Engwell score. Clearly, some materials or analyses may put a different importance on any of the properties.

  • Viscosity
    five
    5 Stars for the viscosity closest to water
  • Hardness
    five
    5 Stars for the resin closest to the hardness of common rock forming minerals.
  • Cure Time
    five
    5 Stars for shortest cure time
  • Composition
    five
    5 Stars for the cleanest composition that would not compromise a SIMS analysis
  • Cathodoluminescence
    five
    5 Stars for the lowest luminescence
  • e-Beam Damage
    five
    5 Stars for the most robust resin to e-beam bombardment
  • Bonding, Gap and Relief
    five
    5 Stars for the best bonding, smallest gap and minimal polishing induced relief.
 
Epoxy Resin Viscosity Vacuum Test Hardness Cure Time Composition Bonding Gap Relief 'Luminescence e-beam Damage Engwell Score
EpoThin
five
five
two stars
three half stars
4 star
five
two half stars
One star
starry star
One star
32
EpoHeat
4 star
three half stars
starry star
Four and a half stars
five
five
One star
two stars
starry star
starry star
34
EpoxiCure (Cured at Room Temperature)
starry star
three half stars
five
three half stars
4 star
five
4 star
4 star
starry star
five
40
EpoxiCure (Cured at 65oC)
starry star
three half stars
five
three half stars
starry star
five
One star
starry star
4 star
two stars
33
TransOptic
1 none
1 none
4 star
five
five
1 none
two stars
One star
Not Tested
1 none
 
ProbeMet
1 none
five
Not Tested
five
1 none
1 none
starry star
4 star
Not Tested Not Tested  
KonductoMet
1 none
4 star
Not Tested
five
1 none
1 none
starry star
five
Not Tested Not Tested  
SpeciFix-20
starry star
starry star
4 star
three half stars
4 star
five
three half stars
five
two half stars
starry star
36.5
EpoFix
starry star
4 star
starry star
starry star
starry star
five
five
4 star
starry star
starry star
36
Ciba Geigy MY778 & HY951
starry star
4 star
4 star
two stars
4 star
five
five
4 star
two stars
five
38
Robnor Resins PX771c
starry star
three half stars
three half stars
1 none
4 star
five
starry star
4 star
1 none
two stars
28
Korapox 439
two stars
starry star
two stars
two stars
starry star
five
Four and a half stars
One star
1 none
two stars
24.5
Domestic Rapid Set Araldite
half sss
Not Tested
1 none
five
One star
Not Tested Not Tested Not Tested Not Tested Not Tested  
Domestic Araldite
half sss
Not Tested
1 none
Four and a half stars
1 none
Not Tested Not Tested Not Tested Not Tested Not Tested  
Varian Torr Seal
half sss
Not Tested Not Tested
4 star
1 none
Not Tested Not Tested Not Tested Not Tested Not Tested  
Petropoxy
One star
three half stars
five
five
two stars
1 none
4 star
starry star
five
half sss
29

 

Comments

  • The Facility recommends the use of EpoxiCure, SpeciFix-20 or EpoFix for SIMS analysis, although other resins should be considered for specific requirements such as low viscosity.
  • Transoptic shatters samples during the pressure/heating procedure and we wonder why it is suggested for delicate samples. It produces a network of gaps in contact with the sample and the surfaces of the pressure vessel. Its pump-down time is long and blisters badly under electron beam impact.
  • Konductomet also fractures samples during the pressure/heating procedure.
  • Rapid-set araldite has a high viscosity and contains C, O, Al and Cl as well as sulphur.