OECD Test 102 – Determining the Melting Point or Melting Range

Perform the OECD 102 test to accurately determine the melting point or melting range of a pure chemical substance. This fundamental parameter of physicochemical characterization is required in REACH , biocides , plant protection products , and cosmetics .

In accordance with OECD guidelines and carried out according to good laboratory practices (GLP) , this test allows for the evaluation of thermal stability , approximate purity , and the detection of any impurities or transformations during the transition to the liquid state.

Technical description:

The OECD 102 test defines several methods for determining the melting point or melting range of a solid substance, depending on its nature:

• Capillary method (direct visualization)
• Inert atmosphere fusion method (if there is a risk of oxidation)
• Method using an automatic fusion apparatus (e.g., Mettler FP)
• Hot plate method or metal blocks

The melting point or interval is recorded between the first appearance of liquid and complete melting. The method is applicable to the majority of non-volatile solid organic and inorganic substances.

OECD Test 102: Frequently Asked Questions

What is the difference between melting point and melting range?

The melting point corresponds to a single temperature for a pure substance, while the melting range is the range of temperatures between the beginning and end of melting. A large difference often indicates an impurity or a mixture .

What substances can be tested with OECD 102?

This test applies to solid , organic or inorganic, non-volatile , and thermally stable . Materials that melt by decomposition require alternative methods.

Is this test mandatory for REACH or cosmetic registrations?

Yes. The melting point is a physicochemical data required in most regulatory dossiers, including REACH, biocides, plant protection products, INCI and pharmacopoeias.

At YesWeLab, we collaborate with a carefully selected network of laboratories, most of which are certified and/or accredited (ISO 17025, COFRAC, etc.). These laboratories are chosen based on your specific needs, the matrices to be analyzed, and the required analytical techniques or methods.
If you have any particular requirements, please do not hesitate to specify them in your request: our scientific team will do everything possible to respond accurately and promptly.
Since 2020, numerous manufacturers, distributors, and engineering firms have entrusted us with the management of their analyses, sending us their samples through our digital platform.
To learn more or submit a specific request, contact our team today.