Overview
Counting blank microspheres are precision-engineered polymer particles designed for laboratory calibration and quality control purposes. These spherical particles serve as reliable reference materials in various analytical techniques, particularly in flow cytometry and cell counting applications. Manufactured to strict specifications, these microspheres typically range from 1-20 microns in diameter with extremely tight size distribution tolerances. Their uniform properties make them ideal for instrument calibration, method validation, and inter-laboratory comparisons.
Physical and Chemical Properties
Counting blank microspheres exhibit exceptional uniformity in size, shape, and optical properties. Most commercial products have a coefficient of variation (CV) of less than 3% in diameter, ensuring reproducible results in analytical applications. The particles are typically made from polystyrene or other inert polymers, often containing fluorescent dyes for specific detection applications. Their density is slightly higher than water, allowing for stable suspension in aqueous solutions without rapid sedimentation.
Main Applications
The primary use of counting blank microspheres is in flow cytometry system calibration and performance verification. They help establish instrument sensitivity, alignment, and compensation settings. Other applications include hematology analyzer calibration, microscope stage micrometer calibration, and quality control in particle counting instruments. Some specialized formulations are used in diagnostic test development and research applications requiring precise particle enumeration.
Safety and Storage
While generally considered non-toxic, counting blank microspheres should be handled with standard laboratory precautions. Avoid creating airborne dust, and use appropriate personal protective equipment when handling dry powders. Storage requires protection from extreme temperatures and direct sunlight. Most products remain stable for 2-3 years when stored properly in their original containers at room temperature. Suspension formulations may require gentle mixing before use to ensure uniform particle distribution.
B2B Procurement Guide
When procuring counting blank microspheres, specify the required particle size, concentration, and any special certifications (e.g., NIST-traceable). Verify the supplier's quality control processes for particle uniformity. Consider ordering multiple size standards if needed for comprehensive instrument calibration. For bulk purchases, request certificates of analysis and consider stability testing for long-term storage. Lead times may vary depending on customization requirements.
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