Sintered glass filter plates & discs

The porosity class sets the pore range: a low number means coarse pores, a high number fine pores. Coarse plates suit gas distribution and coarse precipitates, such as the filter disc, bi-plane, 70 mm, porosity 0. Fine plates hold back fine precipitates but filter more slowly, as with the sintered disc, 120 mm, P4. The notation differs between products, P or Por., so read the pore range in µm on each product page rather than assuming two notations are equal. Funnels with built-in plates are in Büchner and filter funnels. Unsure? Ask sales@luminixhealth.com.

A loose plate or disc is for building into your own set-up or replacing a plate, usually by a glassblower, such as the filter plate for 1000 ml unit, 90 mm. A filter funnel or filter crucible with a fused-in plate is ready to use straight away and needs no glassworking; see Büchner and filter funnels and, for gravimetric work, crucibles. Choose a loose disc only if you have a holder or a glassblower; otherwise the ready-made funnel or crucible is simpler. Check on the product page that a plate is fused in. Questions? Ask sales@luminixhealth.com.

Borosilicate glass is the standard: chemically resistant, transparent and suitable for most filtrations and gas distribution. Quartz glass is chosen where the product page states higher purity or temperature resistance, such as the quartz glass filter disc, bi-plane, 90 mm. Stainless steel frits support membrane filters in 47 mm filter holders and do not break, as with the frit for 47 mm filters, stainless steel. For membrane filtration units, see bottle-top and vacuum filtration units. Check limits on each product page. Questions? Ask sales@luminixhealth.com.

Measure the seat in your set-up first: the disc must fit the inner diameter where it rests. Then choose the version. A bi-plane disc is flat on both sides for clamping or fusing in. A disc with a glass rim is easier to fuse into a tube or funnel. A disc with a bore lets a tube pass through the centre, as with the filter disc with bore, 23 mm, porosity 4. Diameter, thickness and tolerance are in the product title. For custom sizes or doubts, send your drawing to sales@luminixhealth.com.

A sintered glass filter is a disc of fused glass particles with a porosity grade, often 0 to 5, from coarse to fine. It is cleaned and reused. The porosity number, not a micrometre guess, is the specification. Hydrofluoric acid and strong alkali attack the glass.

Filtration holds back what is larger than the pores and lets the rest through. Paper is the ordinary laboratory filter. A membrane has a stated pore size and a polymer that must survive the solvent. A syringe filter is that membrane in a housing on a syringe. Glass fibre takes a higher dirt load. Ultrafiltration holds back macromolecules and passes salts. The pore size, the chemical compatibility and the volume are the three choices. Laboratory apparatus around filtration is indexed under ISO laboratory apparatus.

This shelf belongs to Filtration, inside Lab consumables. Luminix Health distributes this range for laboratory use.

The neighbouring shelves are Filter paper, Syringe filters, Filter cartridges & capsules, Membrane filters, Glass & quartz fibre filters, Bottle-top & vacuum filtration units, Ultrafiltration & concentrators, Filtration accessories, Extraction thimbles and Dialysis tubing & devices. The category above this shelf is Filtration.

Luminix Health distributes this range from the heart of Europe. We deliver across the EU in two to five days if in stock. Standard delivery is free from €250 excl. VAT. Cold-chain goods and dangerous goods under ADR are never included in that free delivery. The terms are in the Shipping Policy. Send a quote request, contact the team, or read who we are. The full brand index is on shop by brand.

The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology. If the article is not on the shelf, request a quote.