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Science and Engineering at The University of Edinburgh

School of GeoSciences

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Hardness Tests

[test] The hardness of the resins were measured using a Shore S1-D hardness tester, factory calibrated and checked against the supplied reference block.

Ten readings were taken from each resin disk. The highest and lowest readings were rejected and the average and standard deviation of the remaining eight are listed below.

The hardness of ProbeMet and KonductoMet was not tested because of the inhomogeneity of the material.


Notes on Hardness:

There are many scales used in the measurement of hardness. The unit most frequently used for resins is the Shore D scale. Some values from every day objects (apart from Indium!) are listed below.
  • Perspex, 87.84 +/- 0.12
  • PVC, 81.10 +/- 0.47
  • Indium, 29.5 +/- 0.42
  • Yellow BIC biro case, 81.5 +/- 0.25

Epoxy Resin Supplier Specification Shore D Hardness
Avg (+/- Stdev)
EpoThin 78

79.1 +/- 0.71

EpoHeat 85

80.1 +/- 0.50

EpoxiCure (Room Temperature Cure) 82

85.3 +/- 0.46

EpoxiCure (Cured at 65oC) 82

84.9 +/- 0.18

TransOptic No specific figure given

82.4 +/- 0.53

SpeciFix-20 84

82.8 +/- 0.45

EpoFix 78

80.1 +/- 1.10

Ciba Geigy  MY778 & HY951 Not Known

82.1 +/- 1.23

Robnor Resin  PX771c 85

81.4 +/- 0.63

Korapox 439 Not Known

79.4 +/- 0.84

Petropoxy Not Known

85.3 +/- 0.78

Domestic Rapid Set Araldite Not Known

78.9 +/- 0.34

Domestic Araldite Not Known

78.5 +/- 0.76

Varian  Torr Seal Not Known

83.8 +/- 0.97

Epotek 85

87.5 +/- 0.14

Nanoindentation Tests

Experiments were carried out by Wenzhong Zhu at the University of the West of Scotland

Two sets of indentation test were carried out on each specimen: One test batch of three test points at maximum load of 100 mN, the other batch of nine test points at a maximum load of 10 mN. The spacing between the indentation points is 100 Ám.


Indent Load ~10mN
Epoxy Resin Youngs Modulus GPa
Avg (+/- Stdev)
Hardness GPa
Avg (+/- Stdev)

Korapox 439

2.335 +/- 0.050

0.084 +/- 0.001

Transoptic

2.737 +/- 0.056

0.094 +/- 0.002

EpoThin

3.495 +/- 0.098

0.126 +/- 0.007


Indent Load ~100mN
Epoxy Resin Youngs Modulus GPa
Avg (+/- Stdev)
Hardness GPa
Avg (+/- Stdev)

Korapox 439

2.323 +/- 0.039

0.079 +/- 0.001

Transoptic

2.777 +/- 0.015

0.090 +/- 0.002

EpoThin

3.506 +/- 0.016

0.123 +/- 0.001

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