Description
Specifications Table
Product Name – Caffeine melting point standard, 235 – 238 °C
Quantity/Pack Size – 1 g
Form – Crystalline powder
Grade – Analytical standard
Application – DSC/TGA calibration, melting point verification
Product Overview
The caffeine melting point standard (235-238°C) is a high-purity crystalline reference material designed for precise calibration of thermal analysis instruments, particularly differential scanning calorimeters (DSC) and thermogravimetric analyzers (TGA). This analytical-grade standard undergoes rigorous purity verification to ensure a sharp, reproducible melting transition, eliminating baseline drift or thermal lag that could compromise experimental accuracy. The material’s uniform particle size distribution and minimal moisture content (<0.1%) prevent premature degradation, while its sealed packaging preserves integrity during storage. Compatible with most commercial thermal analysis systems, this standard adheres to pharmacopeial specifications for melting point determination, making it ideal for quality control labs, research facilities, and educational institutions requiring traceable reference materials. Its chemical stability under standard lab conditions (20-25°C) ensures long-term reliability, with no detectable polymorphism or sublimation under recommended handling protocols. The 1 g pack size provides sufficient quantity for multiple calibrations while minimizing exposure to atmospheric contaminants. For optimal performance, store in the original container with desiccant and avoid prolonged exposure to light or humidity.
FAQs
1. What is the typical shelf life of this caffeine melting point standard under ideal storage?
When stored unopened in its original packaging at 15-25°C with desiccant, the standard retains its certified melting point for at least 24 months from the date of manufacture. Exposure to humidity or temperature fluctuations may reduce this period.
2. Can this standard be used for both DSC and TGA calibration procedures?
Yes, the caffeine standard’s well-defined melting transition and thermal stability make it suitable for calibrating both differential scanning calorimeters and thermogravimetric analyzers, though DSC is the primary application due to its sharp endothermic peak.
3. Are there any known incompatibilities with common lab solvents or materials?
The standard is chemically stable with most inert materials like glass or stainless steel but may dissolve in polar solvents such as chloroform or ethanol. Avoid contact with strong oxidizing agents or alkaline solutions.
4. How does this compare to other organic melting point standards like benzoic acid?
Caffeine offers a higher melting point (235-238°C vs benzoic acid’s 122°C) and a more pronounced endothermic transition, making it preferable for high-temperature calibration. Benzoic acid is often used for lower-temperature verification.
5. What precautions should be taken when handling this standard to prevent contamination?
Use clean, dry tools to transfer the powder and avoid breathing dust. Work in a fume hood if weighing large quantities, and always reseal the container immediately after use to prevent moisture absorption.
