This is used for Buchner Funnels, chromatography columns, parallel synthesis of small molecules for molecular diversity, and peptide synthesis reaction vessels. This is the same as the standard material for laboratory apparatus, i.e. Pyrex 7740, Kimax KG-33, or Schott Duran. Frit porosities are defined in three different systems, as shown below:

1. Ace, nominal pore size, in microns:

A	145-174 µm
B	70-100 µm
C	25-50 µm
D	10-20 µm
E	4-8 µm

2. Kimble & Corning Pore size, in microns:

Extra Coarse	170-220 µm
Coarse	40-60 µm
Medium	10-15 µm
Fine	4-5.5 µm
Very Fine	2-2.5 µm
Ultra Fine	0.9-1.4 µm

3. Robu & Schott (ISO 4793) nominal pore size, in microns:

P00 (P500)	250-500 µm
P0 (P250)	160-250 µm
P1 (P160)	100-160 µm
P2 (P100)	40-100 µm
P3 (P40)	16-40 µm
P4 (P16)	10-16 µm
P5 (P1.6)	1.0-1.6 µm

Please indicate bore size when you place your order.