Whitehouse Scientific

Particle Size and Sieve Standards from Whitehouse Scientific

With an experience of over 25 years, Whitehouse scientific is Europes highest ranking certification laboratory for primary methods of particle size analysis. Sigma- Aldrich offers a wide range of polydisperse particle size standards and sieve calibration standards from Whitehouse scientific.

Certified Polydisperse Particle Size Standards

These NIST and NPL traceable standards were commissioned by the Bureau of Certified References (BCR) and are measured by a large international team including the 20 top laboratories in the field of particle size. For the certification of the glass particles, several unambiguous primary methods such as microscopy, sieving, sedimentation and Coulter counter were used.

The standards are delivered in Sets of 10 vials in quantities suitable for any method of analysis without further subdivision.

Table 1. Polydisperse Particle Size Standards from Whitehouse Scientific

Cat. No.	Product Name	Pack size	Add to Cart
51358	Polydisperse Particle Standard  0.1 - 1 µm	10 x 0.02 g
42459	Polydisperse Particle Standard    1 - 10 µm	10 x 0.1 g
05724	Polydisperse Particle Standard    3 - 30 µm	10 x 0.05 g
94078	Polydisperse Particle Standard    3 - 30 µm	10 x 0.1 g
80847	Polydisperse Particle Standard  10 - 100 µm	10 x 0.25 g
40579	Polydisperse Particle Standard  10 - 100 µm	10 x 0.5 g
08718	Polydisperse Particle Standard  10 - 100 µm	10 x 1 g
57563	Polydisperse Particle Standard  50 - 350 µm	10 x 0.5 g
78456	Polydisperse Particle Standard  50 - 350 µm	10 x 2.5 g
94773	Polydisperse Particle Standard 150 - 650 µm	10 x 2.5g

Certified Sieve Calibration Standards

The Sive Calibration Standards from Whitehouse Scientific offer a unique method of calibrating sieves with traceability to NIST and NPL. The glass microspheres are delivered in sets of single shot bottles in order to eliminate operator sampling errors.
The calibration requires only about 2 minutes following a simple procedure: The glass microspheres are placed into the sieve which is shaken either manually or mechanically, until an equilibrium has reached and no more particles pass the sieve.

Figure 1: Calibration graph for the 63µm sieve standard

By weighing the sieve and the single shot bottle before and after the equilibration, the percentage of microspheres passing the sieve can be calculated and the mean aperture size of the sieve can thus be determined using the calibration graph supplied with the test certificate. Figure 1 shows an example of a calibration graph for the 63µm sieve standard.

Table 2. Sieve Calibration Standards from Whitehouse Scientific

Cat. No.	Product Name	Mesh #	Calibration Range	Pack size	Add to Cart
12655	Sieve Standard 45 µm	325	42.0 - 50.8	5 x 1.0 g
49500	Sieve Standard 63 µm	230	56.6 - 70.4	5 x 1.0 g
42696	Sieve Standard 75 µm	200	67.1 - 82.8	5 x 1.0 g
61847	Sieve Standard 106 µm	140	91.4 - 117	5 x 1.0 g
18867	Sieve Standard 125 µm	120	112 - 139	5 x 1.0 g
75446	Sieve Standard 150 µm	100	134 - 167	5 x 1.5 g
43390	Sieve Standard 180 µm	80	161 - 199	5 x 1.5 g
41544	Sieve Standard 250 µm	60	226 - 281	5 x 2.5 g
67246	Sieve Standard 300 µm	50	270 - 333	5 x 2.5 g
78900	Sieve Standard 500 µm	35	440 - 557	5 x 2.5 g