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American Educational Connecting Kjeldahl Bulb with Stopper for Distilling Apparatus, 50mm Bulb Diameter

4.1 out of 5 stars 16 customer reviews

Price: $11.40 ($11.40 / Each) & FREE Shipping on orders over $35. Details
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Specifications for this item
Brand Name American Educational Products
Part Number 7-400-2-B-1-A
Number of Items 1
Outside Diameter 50  mm
UNSPSC Code 41104820

It is kjeldahl connecting bulb. Comes in 50 millimeter diameter. See more product details


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Product Features

  • Connecting Kjeldahl bulb
  • 50 millimeter diameter
  • Comes with stopper
  • For distilling apparatus
  • Pack of 1

Product Details

  • Shipping Weight: 1 pounds (View shipping rates and policies)
  • Domestic Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • ASIN: B00657LR5O
  • Item model number: 7-400-2-B-1-A
  • Average Customer Review: 4.1 out of 5 stars  See all reviews (16 customer reviews)
  • Amazon Best Sellers Rank: #9,368 in Industrial & Scientific (See Top 100 in Industrial & Scientific)

Frequently Bought Together

  • American Educational Connecting Kjeldahl Bulb with Stopper for Distilling Apparatus, 50mm Bulb Diameter
  • +
  • American Educational 7-302-13 Borosilicate Glass Graham Condenser with Coil-Form Inner Tube, 300mm Length
  • +
  • American Educational  7-771000 Clear Borosilicate Glass 1000mL Flat Bomex Bottom Boiling Flask
Total price: $47.07
Buy the selected items together

Product Description

It is kjeldahl connecting bulb. Comes in 50 millimeter diameter.

Customer Reviews

Top Customer Reviews

By P on September 24, 2012
I ordered the product and received it MONTHS later. Beyond that, when i received the product, it has hairline fractures, and the number 6 stopper is wedged backwards on the bottom, redering it useless until i can get the stopper off, which is very difficult to do because the class is thin and flimsy.
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The tubing is skinny and fairly thin, so you certainly have to be careful with it. Also, it is not high throughput by any means - if you are boiling in a large container this bulb may allow the pressure to rise more than you'd like.

Normally I would give this 4 stars. However, on my third distillation run using this bulb I discovered that the output was fluorescing green! After quite a bit of investigation I discovered that the output stopper on my bulb had a potent fluorescent dye on it (probably fluorescein), and it was visible on the inside of the bubble wrap it came in using a UV light (it was entirely invisible in regular light). Hopefully this was a one-time thing (someone returned this particular bulb, or the person packaging it handled a leaking package of dye beforehand), and not something that is a recurring issue. Either way, since it shipped with an invisible contaminant that was not sufficiently removed with an initial rinse I'm docking it a star.
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This piece of glass works for it's intended purpose, but mine broke the lower tube off in storage. Pretty fragile little thing. Since then, I got a ground-glass kit, so I don't really need this anymore.
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Purchased for high school student who used to make projects. Quality item that was used often.
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Got mine overnight due to Amazon prime, so I got it amazingly fast no problem there. The box came well protected intact I had to go through several layers of bubble wrap then I got to a smaller box then finally encased in bubble wrap finally got to the item,so they really have stepped up shipping protection the product itself is what is pictured exactly nothing more nothing less stoppers came attached facing the correct direction no cracks or dings a lot of people complained about it being thin glass and it is pretty thin but that is to be expected. Like all glassware you just need to be careful handling it.
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This item is perfect for simple distillations, depending on the other glassware chosen, the stoppers may not fit. A few precautions, this item likes to break. The first order, the item broke prior to arrival. This was easily remedied and no harm done, except for a few days time delay. Very good product so far.

Will update as needed.
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This item is super thin, ended up breaking while try to flip the reversed stopper around and stabbed myself pretty badly... It works none the less but it was hell getting all pieces correct. Since it works I give it 2 stars or else it would had received none...
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assumed the robber stopper would fit the graham condenser since they came in a set but neither work, its a size 1(19-15mm) and the condenser is a 20mm inlet... they slide off well and have a nice seal so it wont be hard to replace them, but its just more money
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