Size and count controls4 µmSize Standard and Count Control 4 µmCat. No. 22040-20Pack size 20 mLPrice Size and count controls
Size Standard and Count Control 8 µm
- Cat. No.
- 22080-20
- Diameter
- 8 µm
- Pack size
- 20 mL
- Type
- Certified reference material
- Manufacturer
Technical data
| Nominal diameter | 8 µm |
|---|---|
| Form | suspension |
| Concentration | 10⁷ ± 10% particles/mL |
| Counting channel | ≥ 6 µm |
| Material | Monodisperse polystyrene microspheres |
| Refractive index | 1.59 at 589 nm |
| Density | 1.05 g/cm³ (slow settling) |
| Diameters | 0.1-100 µm |
| Nominal concentration | From 10⁹ particles/mL (0.4 µm) to 10⁴ particles/mL (90-100 µm), referred to a threshold channel |
| Count uncertainty | ±10% |
| Diameter traceability | SI, including NIST |
| Calibration | Electron or optical microscopy, ESZ, SPOS, laser diffraction and ADC, with reference materials from ISO/IEC 17025 accredited institutes and NIST SRMs |
| Pack | 20 mL dropper bottle |
| Storage | Room temperature (4-30 °C) |
Description
Size standard and count control in the same bottle: monodisperse polystyrene microspheres with diameter traceable to SI, including NIST, and number concentration checked on every lot, with a count uncertainty of ±10%. The low-residue aqueous medium keeps background interference to a minimum, and concentrations are ready for direct use or simple dilution in liquid laser particle counters. Refractive index 1.59 at 589 nm and density 1.05 g/cm³, so settling during the test is slow. 20 mL dropper bottles with long shelf life at room temperature.
Applications
- Size calibration of liquid laser particle counters
- Count accuracy check on a threshold channel
- Routine checks and instrument validation
- Known dilutions to check concentration linearity
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.