Quartz 100mm Light-Shielding Cuvette With Stopper, 7 ml, Standard 80, PTFE Stopper, 1pc/ea, C1000SS

Description

Spectroscopy Applications

Light-Shielding Design

This cuvette uses a light-shielding (black-wall) design with a narrow 3 mm internal width. The frosted or coated exterior walls block ambient light from entering the sample chamber, ensuring that only the collimated beam from the spectrophotometer interacts with the sample. This is critical for high-sensitivity absorbance measurements where stray light would otherwise degrade photometric accuracy, particularly at high absorbance values (OD > 3).

PTFE Stopper

The PTFE stopper creates an airtight seal over the cuvette opening, preventing solvent evaporation during extended measurements and protecting air-sensitive or hygroscopic samples from atmospheric exposure. PTFE is chemically inert to virtually all laboratory solvents and contributes no background absorbance or fluorescence, ensuring clean spectra. The stopper fits snugly by friction and can be removed and replaced one-handed for rapid sample exchange. Ideal for volatile solvents, long kinetic runs, and any application where maintaining sample concentration and composition is critical.

Why Standard 80 Construction?

Standard 80 cuvettes are assembled using optical-grade adhesive to bond precision quartz panels, achieving transmittance >80% at 200–2500 nm. This fabrication method delivers reliable optical performance at an accessible price point — ideal for routine measurements with aqueous samples. Standard 80 cuvettes are intended for use with aqueous (water-based) solutions only; organic solvents, strong acids, or strong bases may attack the adhesive joints. For solvent-resistant applications, consider Sintered 83 or Molded 83 alternatives.