NIST Traceable Size StandardsUniform Latex ParticlesWe manufacture uniform plain polystyrene (PS) nano and microspheres in size ranges from 30nm to 15µm. Particles are synthesized by emulsion polymerization or seeded emulsion polymerization which result in a very narrow size distribution. Two types of surface-modified PS latex particles are available: Carboxylated PS latex and Aminated PS latex. These surface modifications cause the particles to be more hydrophilic in nature than our unmodified latex.Product specifications:Concentration: aqueous suspension of 10% w/vaverage diameter tolerance will be within 10% of each specified catalog numberNaN3 preservative <=0.1%recommended storage 2–8oCavailable for order in 5mL, 15mL, and 100mL quantities