Particle size check standard

Check Spheres are an inexpensive particle size standard designed for daily use to confirm the performance of most types of particle size analysers. They are not designed as a replacement for certified reference materials but as an inexpensive daily confirmation of instrument performance.

The Check Spheres are supplied at a 1% concentration, which is considerably higher than most certified materials, thus the amount required to carry out the check is less and substantially more checks can be carried out.

They are available in a range of discrete sizes from 1 µm (micron) to 140 µm.

The Spheres are manufactured using the 'Ugelstad-process' and are extremely monisized, producing CVs of less than 3% on the main peak of the distribution.

The spheres can be supplied with a NIST traceable certificate at an additional cost if required.