Sampling and assaying

TM2 - Metals Sampling and Assaying

All technological metals approved for listing on TM2 must conform to strict requirements on quality, shape and weight, as specified by TM2 Rules.

TM2 Samplers and Assayers are independent organisations skilled in the chemical analysis of metals and play an important role before and after technological metals are listed.


Samplers and Assayers are required to sample and evaluate the chemical quality of technology metals, which are subject to assessment before the technological metal product is approved. The evaluation must comply with the quality requirements outlined in the product specifications.


Samplers and Assayers will issue certificates of analysis based on agreed sampling procedures for technology metals to be placed on TM2 where original providence documentation may not be available.

Current TM2 metal specification for traded products 


Rhodium (Rh)

Name of Product

Baird Rhodium Digital

TM2 Symbol



Rhodium (999.0) in sponge form

Summary Description

Rhodium sponge is a high purity powdered or granular form of rhodium metal with high porosity. Rhodium metal sponge powder is typically coarser than 200 mesh and has a wide variety of uses including functioning as an oxygen getter and catalyst.


Molecular Weight 102.91
Appearance Solid
Melting Point 1966 °C
Boiling Point 3727 °C
Density 12.41 gm/cc
Solubility in H2O N/A
Electrical Resistivity 4.51 microhm-cm @ 20 °C
Electronegativity 2.2 Paulings
Heat of Fusion 5.2 Cal/gm mole
Heat of Vaporization 127 K-Cal/gm atom at 3727 °C
Poisson's Ratio 0.26
Specific Heat 0.0583 Cal/g/K @ 25 °C
Tensile Strength N/A
Thermal Conductivity 1.50 W/cm/K @ 298.2 K

Have any questions?
Please fill in you contact detail

Your e-mail