Grease, boiling stones & sealants

Grease makes a joint slide smoothly and seal well, also under vacuum, but traces can reach your product or sample and must be removed when you clean the glassware; a silicone-free option is the silicone-free ground-joint grease, 100 g. A PTFE sleeve seals without any grease, prevents joints from seizing and leaves nothing behind, which suits trace analysis and syntheses where contamination matters. The size you need is the NS size marked on the joint. Glassware with ground joints is in ground joint glassware. Questions? Ask sales@luminixhealth.com.

Boiling stones give vapour bubbles a place to form, so liquids boil evenly instead of bumping. For analytical work, such as distillations before a determination, use stones made for analysis, like the boiling stones B for analytical work; for preparative work, use the boiling stones A for preparative work. Add them to the cold liquid, never to a liquid that is already hot, because it can boil over violently. Use stones once, as their pores fill up. Questions? Ask sales@luminixhealth.com.

Read the size on the joint itself: the NS or ST marking, such as 29/32, gives the largest diameter and the length of the ground zone in millimetres. The sleeve must carry exactly the same size, as with the PTFE sleeves ST 60/46. Sleeves with a grip collar are easier to remove from a tight joint, such as the ST sleeves for joints, PTFE, with grip collar. Check both parts of the joint before you order; a wrong size does not seal. Unsure which size you have? Send a photo of the marking to sales@luminixhealth.com.

For screw threads on bottles and caps, a flat gasket in the matching thread size seals the joint; choose the material for your liquid, with PTFE for aggressive chemicals. For pipe threads and metal fittings, PTFE tape wrapped in the direction of the thread is the common solution. For hoses and quick couplings, the seal is usually in the connector itself, so you pick the right fitting rather than a separate seal; see hose connectors, adapters and fittings. Check the thread size on the part before ordering. Tell us the connection and we will find the seal: sales@luminixhealth.com.

Grease seals a ground joint. Boiling stones give a liquid a place to start boiling so it does not bump. A sealant does the same job as grease when grease would contaminate the product. They are small, and they decide whether a joint weeps.

The small tools of the bench are what the hand actually holds: a spatula for a powder, forceps for an object that must stay clean, a brush for a narrow neck, a desiccator when a dried sample must not take up water again. None of these reads a measurement. They keep the measurement possible. The apparatus around them is listed under ISO laboratory apparatus.

This shelf belongs to Tools & accessories, inside Labware. Luminix Health distributes this range for laboratory use.

The neighbouring shelves are Spatulas & spoons, Other lab tools & accessories, Lab furniture, trolleys & storage, Tweezers & forceps, Scissors, scalpels & dissecting instruments, Weighing boats, dishes & paper, Desiccators & desiccant, Timers, stopwatches & calculators, Stationery, books & lab notebooks, Brushes & cleaning tools, Stirring rods, spreaders & glass tools, Cutting & sealing tools and Gas handling & burners accessories. The category above this shelf is Tools & accessories.

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.