EPRUI Biotech supplies two different matrix of particle size standards: Polystyrene and Silica. The particle size ranges from 20nm to 100um.
We supplies a full range of size standard microspheres based on patented particle technology. All of our particles standards are determined by Coulter Counter, DPS Disk Centrifuge, Dynamic Light Scattering, TEM, SEM, and Optical Microscope against Standard Reference Materials (SRMs) from the National Institute of Standards and Technology, U.S. Department of Commerce (NIST). The particle sizes of these microspheres are therefore traceable to globally recognized primary standards of NIST SRMs.
All particle size standards supplied from EPRUI are either cross-linked polymer or silica microspheres. The polymer particle size standards >1um in diameter are based on highly crosslinked polystyrene for improving physical and chemical stability.