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Hello to all, I am looking for the Resonance Frequency (H2O) that cause water molecules to "stretch symmetrically". Thanks! Samuel

Hi all. I am in search of a liquid with for following application: I have a PC board covered with 100micron Cu layer. I want a liquid to map/draw/print and circit on the Cu. It have to adhere to the Cu. There after I want to use FeCl3 to dissolve the copper not covered by the "liquid". Then I...

Hi all. I am in search of a liquid with for following application: I have a PC board covered with 100micron Cu layer. I want a liquid to map/draw/print and circit on the Cu. It have to adhere to the Cu. There after I want to use FeCl3 to dissolve the copper not covered by the "liquid". Then I...

Ok! Did some measurements. ~104dB per compressor. And I have 22 of them. The acoustic guy estimates the noise levels to be about 116dB for the plant (still trying to figure out how he got to that). Can you comment on the use of white noise? The alternative would be lagging (and personel...

We use "modified" compressors to pump our process gasses through the plant. We have about 22 compressors that makes quite a lot of noise. ~ 130dB for one, then you add about 6dB for every compressor, thus in total more or less 256dB. We definitely need to provide ear protection for our...

Can you maybe name suppliers based in South Africa? If not, thanks anyway! Greetings Sampi

I am busy designing a venturi pump. the venturi works with air. The objective is to create a lowered pressure in the throught of the venturi to have some "suction" on another pipe that ends in the throught. The pipe contains a gas mixture of N2, H2 and SiH4 (108m3/hr) at about 86.5kPa (1atm)...

What I CAN tell you is that we seperate the Silane isotopes (which is the SiH4-28isotope and the SiH4-30isotope)to produce a very pure silane isotope (that is used to manufacture a super homogeneos silicon for the computer industry). The only process gasses is H2, N2 and SiH4

we produce a very pure SiH4 isotope

The process gasses are SiH4 (silane) and H2 and N2 that is used to flush the lines & equipment from time to time. Silane itself combusts spontaneously when it come in contact with aair (O2). To make things worst it is mixed with H2!! In the vent the "dirty" silane is burned yielding SiO2 (s)...

I am, once again, thrown into the deep end! I am in charge of training and safety of a new plant. I have to train the operators and other personnel concerned with safety. What I have is operational procedures for all the units on the plant as well as a simulator to simulate conditions and...

Flame Temp ~ 1600oC (2900oF) Gas Temperature will probably be around room temperature due to mixing in the pipes with other gases, but the absolute theoretical max. temperature, at the exit of the compressors, is 150oC (300oF). With the MAX. flow rate 200g SiH4/h. It will probably be ~100g/h...

What I know is that the particles sizes of the SiO2 is between 0.1 an 0.001 micron! What happens is during combustion, for some reason, the SiO2 form spider-web-like structures and floats in the air. (I think the get charged and them cling to one another). Will a wet srcubber be able to remove...

to Homayun thanks for the reply! SiO2 is a solid, very fine powder that forms as combustion product. looks almost like a spiders web - saw it once at a leakage in the pipesystem. SiH4(g) + O2(g) --> SiO2(s) + H2O(g, due to high flame temp) The scrubbing liquid is H2O. What I have in mind (due...

Hi 2 all, I have to design a wet scrubber for an effluent gas stream containing a very fine dust. This stream is abtained by burning SiH4 with O2 (it is a spontaneous combustion) to form SiO2 and H2O. The plan is do design a scrubber to remove the SiO2. I just started my career as chem eng and...