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 | European Reference Materials' groups and subgroups |  |
European Reference Materials are organised into six different categories
(groups) that in turn contain several subcategories.
Each group has been assigned a letter and another letter defines each subgroup
in the main groups. The following table summarises the different groups and
subgroups:
You can click on each main group or subgroup to search all materials contained
in it.
| General Category | Letter | Subcategory | Letter | ERM code |
| Non-matrix -materials certified for purity and concentration, activity | A | Solid or liquid inorganic compounds and elements (pure and solutions) | A | AAXXX |
| Gases (pure and mixtures) | B | ABXXX |
| Solid or liquid small organic molecules (pure and solutions) | C | ACXXX |
| Organic macromolecules | D | ADXXX |
| Isotopically labeled materials | E | AEXXX |
| Others | Z | AZXXX |
| Food/Agriculture and related matrix materials certified for composition | B | Potable water and beverages | A | BAXXX |
| Animal matter | B | BBXXX |
| Plant/vegetation matter | C | BCXXX |
| Processed food and foodstuffs not covered above | D | BDXXX |
| Animal feeding stuffs | E | BEXXX |
| GM materials | F | BFXXX |
| Others | Z | BZXXX |
| Environmental and related matrix materials certified for composition | C | Waters (river, sea, ground) | A | CAXXX |
| Waste, effluents and leachates | B | CBXXX |
| Soils, sediments, sludge | C | CCXXX |
| Plant/vegetation matter | D | CDXXX |
| Animal bioindicator matter | E | CEXXX |
| Fly ash, fuel ash, incinerator ash | F | CFXXX |
| Others | Z | CZXXX |
| Health-related matrix materials certified for composition | D | Human body fluids: serum, urine, etc | A | DAXXX |
| Human tissue: hair, bone, teeth, etc | B | DBXXX |
| Others | Z | DZXXX |
| Industrial and engineering materials certified for composition | E | Ferrous alloys | A | EAXXX |
| Non-ferrous alloys | B | EBXXX |
| Polymers, plastics | C | ECXXX |
| Glasses, ceramics | D | EDXXX |
| Minerals, ores, rocks, clays | E | EEXXX |
| Fuels, coal, diesel | F | EFXXX |
| Semiconductors | G | EGXXX |
| Others | Z | EZXXX |
| Materials certified for physical properties | F | Mechanical properties (e.g hardness, impact toughness, viscosity) | A | FAXXX |
| Optical properties (e.g. Wavelength and absorbance materials) | B | FBXXX |
| Thermal properties (e.g thermal conductivity, calorific value) | C | FCXXX |
| Morphological properties (e.g Particle size, surface area) | D | FDXXX |
| Others | Z | FZXXX |
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