Melting point

The melting point is the temperature at which a compound changes from a solid to a liquid state . This parameter is a key indicator of purity, thermal stability, and conformity for many substances: plant extracts, waxes, fats, polymers, active ingredients, or cosmetic ingredients.

Measuring the melting point allows for the characterization of a product , verification of its identity , and the detection of potential impurities or chemical alterations. Indeed, a discrepancy between the theoretical and measured temperatures can reveal a compositional change, incomplete crystallization, or contamination.

Principle and method of analysis

The evaluation of the melting temperature is generally carried out using two approaches:

• Differential scanning calorimetry (DSC) : This thermal method measures the energy absorbed or released by a sample as it changes state. It offers high accuracy and a complete thermal curve , including melting temperature, crystallization, and phase transitions.
• Capillary method : used for powders and pure substances, this technique consists of visually observing the point of transition to the liquid state under progressive heating.

These analyses are essential for the food, cosmetics, polymer and nutraceutical sectors , where control of thermal behavior guarantees the quality and reproducibility of finished products.

For further information on thermal characterization, see also:

• differential scanning calorimetry (DSC ) ,
• thermogravimetry (TGA) ,
• or even the analysis of thermal stability .

Industrial applications

The measurement of melting temperature is relevant in many fields of application:

• Food and nutraceuticals : quality control of vegetable fats, butters, oils or waxes, to ensure good texture and stability at the temperature of use.
• Cosmetics : optimization of solid formulations (balms, lipsticks, hair waxes) whose melting conditions application and preservation.
• Materials and polymers : evaluation of polymer purity and crystallinity, control of additives and material compatibility.
• Phytotherapy and plant extracts : control of the stability of heat-sensitive bioactive compounds (polyphenols, terpenes, flavonoids).
• Chemistry and formulation : characterization of intermediate products or raw materials before integration into an industrial process.

Accurate determination of melting temperature is essential to ensure compliance with technical specifications , validate the purity of raw materials and optimize manufacturing processes .

Analytical interest and related analyses

Melting point analysis is often integrated into a complete heat balance that includes:

• the crystallization point for evaluating reverse transitions,
• the trouble point for studying low-temperature stability,
• the smoke point for edible oils and fats,
• and the melt flow index (MFI) for thermoplastic polymers.

This additional data allows for a better understanding of the thermal behavior, purity and transformation of the analyzed materials.

YesWeLab Services

YesWeLab works in collaboration with a network of partner laboratories accredited to ISO 17025 and/or COFRAC , specializing in thermal, physicochemical, and rheological analyses .
Our experts select the most suitable method based on the nature of the product, its composition, and its field of application .

Thanks to the YesWeLab digital platform , you can order your analyses online, track your samples, and access your reports with complete transparency.
Since 2020, YesWeLab has been supporting manufacturers in the cosmetics, food, chemical, and materials industries with the characterization and quality control of their products.

For any specific request or quote, contact our scientific team today.