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Lieu : États-UnisMembre depuis : 01 sept. 2007

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Avis (133)

300mm,24/40,Glass Spiral Reflux Condenser,New Advance Chemistry Lab Glassware

04 août 2019

Very efficient condenser -- Dimroth type

These are arguably more efficient than a Friedrichs condenser. There is far more surface area available for condensation, with multiple nested cold layers and many redundant drainage channels. However, they are less tolerant of bumping/foaming, so it can be best to place them above a self-draining bump trap and/or chromatography bulb. Be sure to run the coil in the direction that produces counterflow heat exchange. I liked this design so much that I have in total now bought 4 of them in various sizes.

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Sodium Carbonate (Soda Ash, Washing Soda) 5 Lb Pack 9764

08 nov. 2018

Can be used to make bleach

Mix with a concentrated solution of calcium hypochlorite bleaching powder and a dash of lye for stabilization cautiously using a water bath (look up video instructions) to make high concentration sodium hypochlorite bleach. Note the reaction will produce a large amount of calcium carbonate gunk that you may need to dissolve back off your glassware with a reasonably strong hydrochloric acid solution, so try to have some of that or a reasonable substitute on hand in advance. Also be sure to store the bleach solution in a freezer or at least refrigerator for further stability. I get so tired of arbitrary consumer product regulations making weak cleaning chemicals. I use 30% hydrogen peroxide instead of 3%. I intend to do similarly with sodium hypochlorite bleach.

10 5/16" Hose Barb Stem Pneumatic Air Compressor Hose Quick Connect Fitting Plug

14 juin 2019

Saves time

No more screwing hose barb fittings into quick connect fittings

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