We offer uniform polystyrene latex microspheres that may be used for standards, markers, or coated with proteins via adsorption for use in diagnostic tests and assays. Our spheres are synthesized via emulsion polymerization using polystyrene (PS) with or without divenylbenzene (DVB), which confers solvent and heat resistance to the crosslinked beads.nNon-functionalized beads are available in diameters from ~20 nm to 20 µm with typical size CVs of 5-10%. For applications that require highly stringent CVs (e.g. 2-5%) or larger bead sizes, contact us to inquire about product availability or customization. Unless noted otherwise, PS and PS/DVB microspheres are available as ~10% solids (w/w) aqueous suspensions in these standard amounts: 0.5, 1.0, 1.5, and 5.0 g