BACOENG 1.5 Gallon Tempered Glass Lid Stainless Steel Vacuum Chamer Perfect for Stabilizing Wood, Degassing Silicones, Epoxies and Essential Oils

Great unit, like everything about it except for how the valves go through the wall. THere are a couple flimsy orings and the whole valve assembly just flops around. I was able to tap it for ⅛" npt (or ¼", I don't remember right now) and it held well against a gasket, so I was satisfied.

I'm new to vacuum degassing. I did some research on products and settled on the Bacoeng setup. I originally was going to get a smaller chamber but decided to spend a bit extra on the 1.5 gallon size. I'm glad I did. It fits a decent sized container or several small ones for degassing and having the gauge on the side leaves the glass top clear for viewing the process. It's fun to put marshmallows in and let my 7yo learn some things. It holds the vacuum really well. I pulled it to -29.5 and left it for 24 hours and held without issue. The glass lid is heavy and it seals quickly and the chamber walls/floor are thick and sturdy. The gauge and valves that come with it are sturdy and work very well with the chamber and the silicon mat is thick and appears very well made. It's packed really well and arrived quickly with no damage. If I had to nitpick on something, it would be the rubber washer used for the gauge on the inside of the chamber. You've got to tighten the inner nut quite a bit to squish the washer enough to ensure it seals properly. See picture. Having a thicker washer, or maybe one that's a bit more solid would help it seal a bit easier. Otherwise 5 stars all around.

Lo uso para joyería en el proceso de casting, es muy útil, también es seguro y me brinda mucha confianza. Su valor es muy económico y con una bomba de vacío podemos armar el equipo necesario por un precio mucho más inferior que comprar un equipo de marcas para joyería. Se los recomiendo mucho para quienes comienzan y no tienen mucho recurso económico.

I bought this chamber intending to use it for freeze drying, which requires a vacuum around 200 microns. Unfortunately, there are a couple of bad design choices that prevent this chamber from reaching that pressure. The first is that the chamber uses a bulkhead fitting that goes through a hole in the side of the chamber. The bulkhead fitting is flat, and the chamber wall is curved, so it uses a rubber washer and compression to keep the connection sealed. Despite my best efforts, I could never get it to seal well enough to not leak in a tiny bit of air. The best I could do was around 2000 microns (about 0.3% of atmospheric pressure), about 10x higher pressure than I needed. The second problem is that the fittings and hose used are very small in diameter. The hose may have a 1/4" fitting, but it's actual inner diameter is less than 1/8". When running a vacuum pump at very low pressures, the diameter of the hose has to be as large as possible to maintain a good flow rate. I think that this chamber is well suited to tasks like degassing which require a modest vacuum. I saw questions from other potential buyers where BACOENG responded claiming that their chambers can reach as low as 25 microns. I suspect that the chambers that have the fittings on the top (through the flat acrylic lid) can probably get that low, but not this design. Either that or I got a defective fitting. One last thing: The glass lid is very heavy and strong (which is a plus) but the actual chamber walls are pretty thin, and when the chamber is pumped down or vented the metal bottom makes a very loud pop as the atmospheric pressure causes it to bend inward ever so slightly. It is kind of startling and I wish they had made it just a little bit thicker to prevent that.

First, I am super pleased with my purchase. It is made with good quality materials and works as it should. Once assembled, I pulled 25 inches of vacuum and closed the valves. After 30 minutes, the gauge hadn’t moved. I chose the glass lid because of its ability to work with some materials that the acrylic lid was not recommended for. Plus, it also gives you a clear and unobstructed view of what’s going on inside. The vacuum gauge assembly must be attached to the pot, but it only takes a minute and a 16mm wrench. Now for the rest of the story. I am embarrassed to say, but when the unit arrived I could not find the hole in the chamber pot. I sent Baco Engineering a message. Their response was prompt and expressed an honest concern for the issue with a couple of options to address it. They asked if I could send a photo. Well, during the “photo shoot” I found the hole. The point here is that beyond my embarrassment, that Baco Engineering stands behind their products and are very concerned about their quality and customer satisfaction. Well done Baco Engineering.