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Calibration Standards
Accurate measurement of fine particle size materials is important in a wide range of applications: acrylic latex paints, impact modifiers, emulsion based adhesives, PVC resins, pigments, fillers, carbon blacks, abrasives, photographic emulsions, and many others.
CPS Instruments Europe offers a series of calibration size standards in the submicroscopic to macroscopic size range. These standards can be used with a variety of particle sizing equipment to verify instrument calibration. Customers who purchase the CPS Disc Centrifuge receive two of these calibration standards for use with their instrument.
The sizes of CPS calibration standards are verified by direct physical means (eg. sedimentation rate under known conditions or sieve analysis using certified seives). All calibration standards are also cross-checked by measurement against other NIST tracable standards using the CPS Disc Centrifuge when smaller than 100 microns. All standards are guaranteed to be correct in both stated average size (+/- 2%), distribution width (that is, total distribution width and/or half-height width), and with respect to the presence of agglomerates of the primary particles. Many calibration standards below 5 microns particle diameter contain a fraction of agglomerated particles. The majority of agglomerate material in a calibration standard is usually in the form of 'doublets' (two primary particles stuck together), though some standards also contain a fraction of triplet, quadruplet, and higher agglomerates as well. Agglomerates can lead to significant errors in instrument calibration, especially for systems based upon laser light scattering or particle counting, since these systems often do not have sufficient resolving power to differentiate between primary and agglomerated particles.
Standards below 10 microns diameter are normally sold as dispersions in water, although many can also be prepared as non-aqueous dispersions. Standards above 10 micron diameter are available as an aqueous dispersion, a non-aqueous dispersion, or as dry powder. Each standard is shipped with a particle size distribution and certificate of analysis. Please be aware that it may be necessary to substitute a slightly different size standard if stock of one particular size is not available. All aqueous samples are stabilized with an anionic emulsifier unless the purchaser specifies otherwise. The following standards are normally sold as ~0.05% active content dispersions in either water or in 8%/92% ethanol/water; in 125 ml containers:
PVC, 0.223 micron
PVC, 0.263 micron
PVC, 0.377 micron
PVC, 0.460 micron
PVC, 0.585 micron
PVC, 0.855 micron
PVC, 1.27 micron
Polystyrene, 0.354 micron
Polystyrene, 0.996 micron
Polybutadiene, 0.40 micron
Monocrystalline Diamond, 0.52 micron (Stokes equivalent size)
Standards between 0.1 micron and 2 microns are also available in a range of other polymers, including polystyrene, polymethyl methacrylate, and polyvinylidene chloride. Certified standards can be produced to your specification by special order. In most cases, we can ship a special order standard that is +/- 5% from your requested (target) size. Please inquire for details about special orders.
These standards are all spherical (or nearly spherical), non-porous, PVC homopolymer or copolymer particles, and are normally sold as either an aqueous suspension (125 ml) or as a dry powder. Sizes larger than 22.4 microns contain 10 grams active weight, 17.5 and 22.4 micron sizes contain 5 grams active weight.
17.5 microns, total width +/- 2.5 microns
22.4 microns, total width +/- 2.3 microns
27.9 microns, total width +/- 3.3 microns
34.6 microns, total width +/- 3.4 microns
41.5 microns, total width +/- 3.5 microns
49 microns, total width +/- 4 microns
58 microns, total width +/- 5 microns
69 microns, total width +/- 6 microns
82.5 microns, total width +/- 7.5 microns
98 microns, total width +/- 8 microns
115.5 microns, total width +/- 9.5 microns
137 microns, total width +/- 12.5 microns
167 microns, total width +/- 17 microns
The above distribution comes from the CPS Disc Centrifuge. It is a mixture of 9 calibration standards.
CPS Instruments Europe offers a series of calibration size standards in the submicroscopic to macroscopic size range. These standards can be used with a variety of particle sizing equipment to verify instrument calibration. Customers who purchase the CPS Disc Centrifuge receive two of these calibration standards for use with their instrument.
The sizes of CPS calibration standards are verified by direct physical means (eg. sedimentation rate under known conditions or sieve analysis using certified seives). All calibration standards are also cross-checked by measurement against other NIST tracable standards using the CPS Disc Centrifuge when smaller than 100 microns. All standards are guaranteed to be correct in both stated average size (+/- 2%), distribution width (that is, total distribution width and/or half-height width), and with respect to the presence of agglomerates of the primary particles. Many calibration standards below 5 microns particle diameter contain a fraction of agglomerated particles. The majority of agglomerate material in a calibration standard is usually in the form of 'doublets' (two primary particles stuck together), though some standards also contain a fraction of triplet, quadruplet, and higher agglomerates as well. Agglomerates can lead to significant errors in instrument calibration, especially for systems based upon laser light scattering or particle counting, since these systems often do not have sufficient resolving power to differentiate between primary and agglomerated particles.
Standards below 10 microns diameter are normally sold as dispersions in water, although many can also be prepared as non-aqueous dispersions. Standards above 10 micron diameter are available as an aqueous dispersion, a non-aqueous dispersion, or as dry powder. Each standard is shipped with a particle size distribution and certificate of analysis. Please be aware that it may be necessary to substitute a slightly different size standard if stock of one particular size is not available. All aqueous samples are stabilized with an anionic emulsifier unless the purchaser specifies otherwise. The following standards are normally sold as ~0.05% active content dispersions in either water or in 8%/92% ethanol/water; in 125 ml containers:
Standards between 0.1 micron and 2 microns are also available in a range of other polymers, including polystyrene, polymethyl methacrylate, and polyvinylidene chloride. Certified standards can be produced to your specification by special order. In most cases, we can ship a special order standard that is +/- 5% from your requested (target) size. Please inquire for details about special orders.
These standards are all spherical (or nearly spherical), non-porous, PVC homopolymer or copolymer particles, and are normally sold as either an aqueous suspension (125 ml) or as a dry powder. Sizes larger than 22.4 microns contain 10 grams active weight, 17.5 and 22.4 micron sizes contain 5 grams active weight.
The above distribution comes from the CPS Disc Centrifuge. It is a mixture of 9 calibration standards.