Powder size standards170 µmPowder MicroStandards™ Particle Size Standard 170 µmCat. No. 82017-01Pack size 1 gPrice Powder size standards
Powder MicroStandards™ Particle Size Standard 250 µm
- Cat. No.
- 82025-01
- Diameter
- 250 µm
- Pack size
- 1 g
- Type
- Certified reference material
- Manufacturer
Technical data
| Nominal diameter | 250 µm |
|---|---|
| Form | powder |
| Particles per gram | about 1.2 × 10⁵ |
| Material | Cross-linked polystyrene |
| Density | 1.05 g/cm³ |
| Refractive index | 1.59 at 589 nm |
| Diameters | 3-500 µm (34 diameters) |
| Quantity | 1 g |
| Traceability | SI and NIST, through standards certified by ISO 17025 accredited metrology institutes and NIST SRMs |
| Calibration uncertainty | Below 2.5%, as required by ISO 21501-4 |
| Lot certificate | Certified mean diameter |
| Storage | Room temperature (4-30 °C), away from direct sunlight |
Description
Cross-linked polystyrene microspheres as dry powder, for size and count instruments that can only be calibrated with dry particles. The certified mean diameter is traceable to SI and NIST through standards certified by ISO 17025 accredited metrology institutes and NIST reference materials, with a calibration uncertainty below 2.5%: the level required by ISO 21501-4 for airborne particle counters. Density 1.05 g/cm³, refractive index 1.59 at 589 nm, diameters from 3 to 500 µm in 1 g bottles. They are not meant to be redispersed in water.
Applications
- Calibration and verification of airborne particle counters (ISO 21501-4)
- Dry dispersion particle sizers, such as dry laser diffraction
- Size and count instruments that accept dry particles only
What you receive
Certificate
Lot certificate with certified diameter or concentration, traceable to NIST and SI.
Import and shipping
Import, customs and Italian invoice handled by VitaSan Labs, tracked shipping.
Technical support
We help you choose diameter, concentration and format for your instrument and method.
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Are the standards traceable?
Yes: mean diameter, standard deviation and uncertainty are traceable to NIST and the International System of Units (SI) and stated on the certificate of every lot. The ISO/IEC 17025 series is certified by an accredited metrology laboratory.
Which control do I need for USP <788>?
For subvisible particle counting in injectables, use the PharmaCount controls: the USP <788> set for routine verification, the 3M and PC sets for single diameters. For USP <729> there is PharmaCount BiCal.
Can I order a diameter I do not see?
Yes: other diameters, concentrations and dyes are available on request. Tell us the value you need and we will send a quote.
How do I see the prices?
List prices per pack, excluding VAT, are shown after signing in to the customer area. With the quote request we confirm price, availability and delivery time.