Differences Between Quartz and Glass Cuvettes

Here is the English translation of the comparison between quartz and glass cuvettes:
Quartz cuvettes and glass cuvettes play different roles in laboratories. Based on professional experimental guidelines, they have significant differences in the following core dimensions:
1. Wavelength Range
석영 보울: Have an extremely broad transmission range, covering ultraviolet (자외선), visible, and near-infrared regions (typically 190–2500 nm). They exhibit high transmittance and no absorption peaks in the UV band (190–400 nm).
유리 컷: Are only suitable for the visible light region (typically above 340 nm). They strongly absorb light below 320 nm in the UV region and therefore cannot be used for measuring substances in the UV range.
2. Chemical Resistance
석영 보울: Made of high-purity silicon dioxide, they possess excellent corrosion resistance. Except for hydrofluoric acid (HF), which must be strictly avoided, they can withstand most strong acids (e.g., 6 mol/L hydrochloric acid), absolute ethanol, and organic solvents without degradation.
유리 컷: Have relatively weaker chemical resistance. Although brief exposure to most strong acids at room temperature is safe, prolonged contact or exposure to strong alkalis (especially when heated) can easily corrode the glass surface, causing it to turn white and rough while reducing transparency.
3. Thermal & Physical Properties
석영 보울: Feature an extremely low coefficient of thermal expansion, allowing them to withstand rapid temperature fluctuations from -50°C to +150°C without cracking. They also have high mechanical strength with a Mohs hardness of up to 7.
유리 컷: Have limited heat resistance and are prone to deformation or cracking at temperatures exceeding 90°C.
4. Identification Methods
Letter Markings: Typically, quartz cuvettes are marked with the letters “Q”, “S”, or “QS” (representing Quartz) on the rim, whereas glass cuvettes are marked with the letter “G” (representing Glass).
Instrument Testing Method: If the markings are unclear, you can set the spectrophotometer wavelength to around 250 nm for testing. A cuvette with an absorbance value of less than 0.07 Abs is made of quartz, while one with a significantly higher absorbance value is made of glass.
5. Cost & Lifespan
석영 보울: Have the highest initial purchase cost. However, if properly maintained (avoiding scratches and HF exposure), they boast the longest lifespan and can typically be used for several years.
유리 컷: Are moderately priced with a lifespan usually measured in months or years. It is recommended to replace them every 1–2 years to prevent decreased transmittance.