Achieve high visual contrast with Thermo Scientific™ ChromoSphere™-T Certified Size Standards, colored polymer microspheres with NIST™-traceable diameters. These reference and calibration materials are used in the testing of filtration systems, vial cleaning evaluations, contamination control studies and calibration of injection devices.
ChromoSphere-T Size Standards were developed for use as reference or calibration materials in applications where a high visual contrast is desired. The product line consists of a large assortment of uniform particle sizes between 50 and 500 microns in either red or black color.
Internally dyed with deeply colored red or black dyes, resulting in very high contrast and visibility relative to most background materials
Mean diameters traceable to the standard meter through the National Institute of Standards and Technology (NIST)
Calibrated by optical microscopy
Made from cross-linked polystyrene divinylbenzene (PS-DVB) copolymer
Available as dry powders
Easily dispersed in aqueous media with the aid of a small amount of surfactant or in lower alcohols, such as methanol or ethanol
Minimal dye extraction when particles are suspended in pure alcohols
Other organic solvents, such as ethers or chlorinated hydrocarbons, should be avoided because they will swell the particles and completely extract the dye.