Standard Sample & Sample Preparation /

Certified Reference Materials (CRMs), RM, SUS & Consumables

What is the difference between CRM, RM, SRM, ERM & SUS?

Reference material (RM) is the generic term for a group of either pure substances or matrix materials, which are used for calibration, method validation, the establishment of metrological traceability, method development, and various quality control purposes (proficiency testing, charting, etc). If the reference material fulfils a number of requirements (proven homogeneity and stability, characterisation of the property values using suitable, well-described and validated methods) this information may be summed up in a certificate, thus being a certified reference material (CRM). SRM® is a trademark registered by the US National Institute for Standards and Technology (NIST) for the certified reference materials they produce and stands for Standard Reference Material. Any ERM® is a trademark of the European Communities for CRMs produced by partners of the European Reference Material (ERM) co-operation and fulfilling stringent quality criteria.

Reference Material Certificate - Document accompanying a certified reference material stating one or more property values and their uncertainties, and confirming that the necessary procedures have been carried out to ensure their validity and traceability. (ISO Guide 30: 1992)

Setting-up Samples (SUS) have an uncertified analysis and to be used as a guide. They are used to meet the day-to-day setting-up requirements or shift-to-shift adjustment of spectrometers or instrument for production control analysis. The quality of SUS samples is to be homogeneous.

RM (Reference Material)

Reference Material (RM) - Material, sufficiently homogeneous and stable with respect to one or more specified properties, which has been established to be fit for its intended use in a measurement process

  • RM is a generic term.
  • Properties can be quantitative or qualitative, e.g. identity of substances or species.
  • Uses may include the calibration of a measurement system, assessment of a measurement procedure, assigning values to other materials, and quality control.
  • A single RM cannot be used for both calibration and validation of results in the same measurement procedure.
  • International Vocabulary of Metrology – Basic and General Concepts and Associated Terms has an analogous definition (VIM - ISO/IEC Guide 99:2007, 5.13), but restricts the term "measurement" to apply to quantitative values and not to qualitative properties. However, Note 3 of ISO/IEC Guide 99:2007, 5.13, specifically includes the concept of qualitative attributes, called "nominal properties".

(ISO Guide 30:1992/Amd 1:2008)


Reference material characterized by a metrologically valid procedure for one or more specified properties, accompanied by a certificate that provides the value of the specified property, its associated uncertainty, and a statement of metrological traceability

  • The concept of value includes qualitative attributes such as identity or sequence. Uncertainties for such attributes may be expressed as probabilities.
  • Metrologically valid procedures for the production and certification of reference materials are given in, among others, ISO Guides 34 and 35.
  • ISO Guide 31 gives guidance on the contents of certificates.
  • VIM has an analogous definition (ISO/IEC Guide 99:2007, 5.14).

(ISO Guide 30:1992/Amd 1:2008)


Setting-up Samples (SUS) have an uncertified analysis and to be used as a guide. They are used to meet the day-to-day setting-up requirements or shift-to-shift adjustment of spectrometers or instrument for production control analysis. This process is usually called "drift correction", "standardization of the calibration", or "re-standardization" depending on manufacturers. The quality of SUS samples is to be homogeneous.


We supply various accessories & consumables for

  • OES Spectrometer - Gas regulator, AVR / UPS, Tungsten Electrode, Argon Copper tube & fittings, filter pad, Electrode brush, Ferrous Sample Sand Paper, JIS Mushroom mould for Aluminium Alloy, Chill Cast Mould for Cast Iron, Sample Holder, Sample Grinders & etc.
  • XRF Spectrometer - Gas regulator, Normal & Thermal printer paper, XRF poly-C film, XRF Etnom® Film, XRF Mylar® Film, XRF Poly-Propylene Film, XRF Prolene® Film, XRF Ultralene Film, XRF sample cups, CK-100 Cup, Aluminium (Al) Cap, On-site Sample Preparation Tools kit, Drift Monitor Samples, SUS-Check Samples & X-ray light bulb. XRF Sample Cups available for Shimadzu, Oxford (X-Supreme & Lab-X), Spectro, Bruker, JEOL, Rigaku, Horiba, Thermo, Panalytical, Niton, Innox-X, Skyray, Jordan Valley, ARL, Asoma, Kevex, Metorex, Siemens, Spectrace, Philips, Fisons.
  • ONH Analyzer - Universal Graphite Crucible, Standards, Accelerators & etc.
  • CS Analyzer - Universal Ceramic Crucible (High Quality), Standard, Accelerators & etc.
  • Microscope - Glass slide & Coverslips, scaled slide, Calibration slides, Lens Cleaning Tissues, Storage Box, Dust cover, light bulb, light illuminator (UV and Fluorescent), Camera adaptations, Objective lens, Immersion Oil, Lens cleaning kit, Filters & etc.

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