Sampling and assaying

TM2 - Metals Sampling and Assaying

All digital metals approved for listing on the TM2 must conform to strict requirements on quality, shape and weight, as outlined by the TM2.

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

Before

Samplers and Assayers are required to sample and evaluate the chemical quality of metals, which are subject to assessment, before a digital metal product is approved. Evaluation must comply with the quality requirements outlined in contract specifications.

After

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

Current TM2 metal specification for traded products (as of november 1, 2019)

Metal

Rhodium (Rh)

Name of Product

Baird Rhodium Digital

TM2 Symbol

BRD

Form

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.

Properties:

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