TGA Measurements under controlled humidity - METTLER TOLEDO

TGA-Sorption System

Measurements with controlled humidity

The TGA-Sorption System is designed to analyze materials under defined conditions of temperature and relative humidity (RH).

  • Unique flexibility – a highly sensitive thermobalance combined with full sorption analysis capability
  • Defined environment – the effect of moisture and temperature on material properties can be easily investigated
  • Pre-conditioning versatility – methods allow the use of elevated preconditioning temperatures (up to 150 °C)

 

The design concept combines the performance and versatility of the large furnace TGA 1,TGA 2, TGA/DSC 1, TGA/DSC 2, TGA/DSC 3+ or TGA/SDTA85xe thermobalance with a unique interface approach that allows a humidity generator to be connected via a transfer line within a few minutes.

Measurements at controlled relative humidity provide information that is crucial for understanding the effects that moisture content can have on the properties of a wide range of materials:

  • Processing – spray-dried powder that becomes moist can potentially block production equipment
  • Product shelf life – can be shortened by moisture uptake due to inadequate packaging
  • Structural properties – moisture content can reduce bioavailability and influence the therapeutic effect

 

 

関連文書

製品パンフレット

STARe Excellence ソフトウェア カタログ(日本語版)
熱分析は、さまざまな分野で広く使用されている確立された分析手法です。 品質保証、品質管理、プロセス開発、製品開発、そして研究において貴重な結果と新しい情報を提供します。 さまざまな熱分析手法を組み合わせて使用することで、多くの問題を解決することができます。
STAR熱分析システム(日本語版)
熱分析は、サンプルが加熱、冷却、または一定温度で保持された場合の物理的または化学的特性の変化を温度あるいは時間の関数として測定する技術です。

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TGA-Sorption System

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TGA-Sorption System

Application Examples

   

Dynamic sorption curve

The TGA curve shows the uptake and release of moisture by a sample of amiloride hydrochloride dihydrate as a function of relative humidity (RH). The stages of the analysis include:

  • Temperature program with a preconditioning segment (dehydration) at 125 °C (dotted line)
  • Increase of RH in steps of 10% with equilibration (red curve)
  • Resulting weight changes for each 10% change in RH (black curve)

At a RH of about 50%, the substance has regained its original water of crystallization. Further increase of RH results in the uptake of free surface water. This is liberated when the RH is reduced.

 

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