The Institute provides a limited number of Reference Materials (RM). The materials are very well characterised and of a high industrial relevance.


Production of Reference materials (RM)

The Institute for Interlaboratory Studies started preparation of Reference Materials in 1996, to aid its participants in their needs for additional proficiency support. The Reference Materials are certified on the basis of the results of one or more interlaboratory studies. The materials are multipurpose and available in handy quantities. Certification reports are available for each RM and can be obtained from the Institute. The certificates available through this web site are for information only and are not the valid certificates.

All reference materials have a guaranteed shelf life. The Institute regularly monitors the validity of the materials and after a positive evaluation the shelf life is extended and the corresponding certificate is updated.

However, it has to be noted that the RMs are only available for participants in one of the iis PT schemes.

How to order the Reference Materials? Order them via this orderform.


Available Reference Materials produced by iis

Type of Reference Material Certified values Amount
ultra low sulfur B5 diesel Mono Aromatics by IP 391 (in %M/M), Cloud Point, Density @ 15°C, Sulphur (9.96 ± 0.28 mg/kg), Water (in mg/kg)

100 ml

ultra low sulfur B7 diesel Poly-Aromatics by IP 391, Cloud Point (-3.15 ± 0.16 °C), CFPP (-13.58 ± 0.26 °C), Pour Point, Density, Sulphur (7.26 ± 0.12 mg/kg), Flash Point (62.6 ± 0.2 °C), Kinematic Viscosity @40°C, D86 distillation and Water (52.1 ± 1.7 mg/kg).

100 ml

n-decane for Flash Point Flash Points near 50°C using methods IP170 / ISO13736, ASTM D56, D3828/IP303 & IP523/ISO3679

100 ml

Regular aviation kerosine (type Jet Fuel A1) Aromatics, Density @ 15°C, Freezing Point, Kin. viscosity, MSEP, Naphtalenes, Smoke Point, Sulphur, Distillation (i.b.p., 50% rec., f.b.p.)

250 ml

High purity o-xylene p-Xylene, m-Xylene, Ethylbenzene, Cumene, Styrene, Ethyltoluene, n-Propylbenzene

55 ml

Used lubricating oil/waste oil Wear metals: Al, Ba, Ca, Cr, Cu, Mg, P, Zn

10 ml

Fuel Oil Micro Carbon Residue

20 ml

Ethanol Purity, Purity on db, Strength %V/V, Apparent Density @20°C, water

100 ml

Mono Ethylene Glycol, MEG Acidity D1613, Aldehydes, Colour Pt/Co, Density at 20°C, D1078 distillation, Iron, Specific Gravity 20/20 °C and Water.

250 ml

Methanol Colour, Density at 20°C, Specific Gravity 20/20°C, IBP (D1078), 50% rec. (D1078), Dry Point (D1078), Benzene, Ethanol

250 ml



  • Multipurpose materials
  • The reference materials can be used for various test parameters, since they were validated for more than one parameter. In principal the materials have been tested according to common commercial specifications.
  • The parameters that could be certified with the highest certainty are indicated on the certificate as 'reference values', in agreement with ISO Guide 34 and 35. Those parameters that could not be certified with the highest certainty, are still referred on the certificates, but as indicative values only.




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