Search found 19 matches

by Yang Minju
Fri Aug 31, 2018 7:02 am
Forum: New User Chat Area
Topic: Chamber contamination by vacuum grease
Replies: 22
Views: 2340

Re: Chamber contamination by vacuum grease

I bought a valve! The only thing left is waiting...
by Yang Minju
Thu Aug 30, 2018 8:39 am
Forum: New User Chat Area
Topic: Chamber contamination by vacuum grease
Replies: 22
Views: 2340

Re: Chamber contamination by vacuum grease

I found the same cheaper ball valve on eBay! https://www.ebay.com/itm/Ball-Valve-Vacuum-isolation-both-sides-KF16-flange-Stainless-Steel-Body-A53X-LW/172169127841?hash=item28161467a1:g:-HsAAOSw44BYLVKy The seller says the working range is 5*10-2 pa(maybe around 3 micron?). I plan to use this as a va...
by Yang Minju
Wed Aug 29, 2018 3:10 pm
Forum: New User Chat Area
Topic: Chamber contamination by vacuum grease
Replies: 22
Views: 2340

Re: Chamber contamination by vacuum grease

Thank you for your advice. I plan to buy a low-cost ball valve at Amazon for $80. I think I'll be able to post pictures of deuterium gas plasma on the forum. I hope this is the last problem... By the way, do I have to put the plasma pictures on du jour to join the plasma club? I'm not sure, but this...
by Yang Minju
Tue Aug 28, 2018 1:54 pm
Forum: New User Chat Area
Topic: Chamber contamination by vacuum grease
Replies: 22
Views: 2340

Re: Chamber contamination by vacuum grease

I'm so glad I guessed right! But I have a short question. I can not ventilate the pump line, so I unlock the vacuum gauge KF on the chamber to release the vacuum and close the KF with a cap. Will the chamber become contaminated again? If so, I would like to vent by adding KF T-way to the fore line. ...
by Yang Minju
Mon Aug 27, 2018 11:51 am
Forum: New User Chat Area
Topic: Chamber contamination by vacuum grease
Replies: 22
Views: 2340

Re: Chamber contamination by vacuum grease

Fortunately, I didn't re-apply the vacuum grease. I have a chance! I checked the valve hole for a good blockage and tried turning the pump on again. I was nervous at first, but I was really happy to see the chamber fall down to 10 microns! As I thought, the valve was the problem. I'm thinking of rep...
by Yang Minju
Sun Aug 26, 2018 12:51 pm
Forum: New User Chat Area
Topic: Chamber contamination by vacuum grease
Replies: 22
Views: 2340

Re: Chamber contamination by vacuum grease

oops, I forgot to draw the gas dryer. Fortunately, I checked the problem point and the seal was good! But terrible problem is appeared...When I closed the valve between the chamber and the pump, I found that there was a leakage of 400 microns per second. I've sprayed the IPA and checked it, but I do...
by Yang Minju
Fri Aug 24, 2018 4:30 pm
Forum: New User Chat Area
Topic: Chamber contamination by vacuum grease
Replies: 22
Views: 2340

Re: Chamber contamination by vacuum grease

The scratch is large enough to be seen and touched. O-ring and vacuum grease seem to be keeping the vacuum well, considering that no problem when IPA was sprayed. The scratch is located above the ISO63 flange.
I will be able to reply after 20 hours. Thank you very much for your help!
by Yang Minju
Fri Aug 24, 2018 2:21 pm
Forum: New User Chat Area
Topic: Chamber contamination by vacuum grease
Replies: 22
Views: 2340

Re: Chamber contamination by vacuum grease

Sadly, I have already sealed a leak point using hysol...I'm sorry. I heartily Thank you for your consideration. The next day, when the hysol is fully cured, it will connect to the chamber again and test the vacuum. This time, I hope the chamber will go below 50 microns without any leaks. By the way,...
by Yang Minju
Fri Aug 24, 2018 6:27 am
Forum: New User Chat Area
Topic: Chamber contamination by vacuum grease
Replies: 22
Views: 2340

Re: Chamber contamination by vacuum grease

Thank you for your advices! Unfortunately, I don't have an extra Viton O-ring, but I don't think I'll handle this part again, so I could seal it with a hysol 1c. Also, Dow Corning Vacuum Greece have low vapor pressure, so i think it does not seem to affect the chamber if contaminated. First of all, ...
by Yang Minju
Thu Aug 23, 2018 1:37 pm
Forum: New User Chat Area
Topic: Chamber contamination by vacuum grease
Replies: 22
Views: 2340

Chamber contamination by vacuum grease

Hello. I started my first chamber yesterday. But the vacuum didn't drop below 15,000 microns, and I used IPA and find the leak at the diff pump. But I tried using a lot of Dow corning vacuum grease to stop the leak because leak looked small. The pressure was reduced to 600 microns as soon as, but so...