301.1 Particle Size (powder and solid forms) These SRMs are for evaluating and calibrating specific types of particle size measuring instruments, including light scattering, electrical zone flow-through counters, optical and scanning electron microscopes, sedimentation systems, and wire cloth sieving devices. SRMs 1003c, 1004b, 1017b, 1018b and 1019b each consist of soda-lime glass beads covering a particular size distribution (PSD) range. RM 8010 is a three bottle set of different sands (A, C and D), intended for use in sieving only, and covers the sieve size range from 30 mesh to 325 mesh. SRM 659 consists of equiaxed silicon nitride particles measured using sedimentation. SRM 1978 consists of granular, irregular shaped zirconium oxide particles measured using sedimentation. SRM 1982 consists of spheroidal particles measured using scanning electron microscopy, laser scattering, and sieving. SRMs 1690, 1691, 1692, 1963 and 1964 are commercially manufactured monodisperse latex particles in a water suspension. SRMs 1960 and 1961 are monodisperse latex particles in a water suspension produced by the National Aeronautics and Space Administration (NASA). SRM 1965 consists of two different groupings of the SRM 1960 particles mounted on a microscope slide. Technical Contact: james.kelly@nist.gov RMs 8011, 8012 and 8013 are gold nanoparticles in water. Technical Contact: vincent.hackley@nist.gov Printer Friendly PLEASE NOTE: The tables are presented to facilitate comparisons among a family of materials to help customers select the best SRM for their needs. For specific values and uncertainties, the certificate is the only official source. - View Detail    - View Certificate    - View Report of Investigation   - View MSDS        SRM Description Particle Diameter Distribution (mm) Unit Size   1003c Glass Beads 20 to 45 (635 to 325 mesh) 28 g 1004b Glass Beads  40 to 150 (270 to 120 mesh) 43 g   1017b Glass Beads  100 to 400 (140 to 45 mesh) 70 g   1018b Glass Beads  220 to 750 (60 to 25 mesh) 87 g   1019b Glass Beads 750 to 2450 (20 to 10 mesh) 200 g   1021 Glass Beads 2 to 12 4 g   8010 Sand A (30 to 100 mesh) C (70 to 200 mesh) D (100 to 325 mesh) 130 g 130 g 130 g        SRM Description Particle Diameter Distribution (mm) Unit Size 659 Silicon Nitride 0.2 to 10 5 vials: 2.5g each 1978 Zirconium Oxide 0.33 to 2.19 5 g 1982 Zirconium Oxide 10 to 150 10 g   1984 Tungsten Carbide/Cobalt 9 to 30 14 g   1985 Tungsten Carbide/Cobalt 18 to 55 14 g        SRM Description Particle Diameter, nominal (mm) Unit Size 1690 Polystyrene Spheres (1 µm) 0.895 5 mL vial 1691 Polystyrene Spheres (0.3 µm) 0.269 5 mL vial  1692 Polystyrene Spheres (3 µm) 2.982 5 mL vial 1961 Polystyrene Spheres (30 µm ) 29.64 5 mL vial  1963a Polystyrene Spheres (0.1 µm) 0.1018 5 mL vial  1964 Polystyrene Spheres (0.06 µm) 0.06039 5 mL vial 1965 Polystyrene Spheres (10 µm) (on slide) 9.94 (hexagonal array) 9.89 (unordered clusters) 1 slide        SRM Description Particle Diameter, nominal (nm) Unit Size 8011 Gold Nanoparticles 10 nm 2 ampoules: 5 mL each 8012 Gold Nanoparticles 30 nm 2 ampoules: 5 mL each 8013 Gold Nanoparticles 60 nm 2 ampoules: 5 mL each