OECD Test 102 – Determination of 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 , phytosanitary and cosmetic .

Compliant with OECD guidelines and carried out according to good laboratory practices (GLP) , this test allows the evaluation of thermal stability , approximate purity , and the detection of possible 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)
• Fusion method under inert atmosphere (if risk of oxidation)
• Method using automatic fusion apparatus (e.g. Mettler FP)
• Hot plate or metal block method

The melting point or range is recorded from the first appearance of liquid to 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 is a single temperature for a pure substance, while the melting range is the temperature range between the beginning and end of melting. A large gap often indicates an impurity or mixture .

What substances can be tested with OECD 102?

This test applies to solid substances , organic or inorganic, non-volatile and thermally stable . Materials melting 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, phytosanitary products, INCI and pharmacopoeias.

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