Thoughts on helpful Videos

NTS, 03/04/2014

Videos

I have found some videos to share some cleanroom info. There will probably be at least a few (if not more) good bits of new info in each. I'll also add my notes.

Video 1 (Cleanroom)

https://www.youtube.com/watch?v=tVAZo2uhOB0&noredirect=1

What an awesome soundtrack! No one uses the ISO specification in my experience.

Video 2 (Gowning)

https://www.youtube.com/watch?v=qRGcdjxMHd0&noredirect=1

[Watch to just 4:53]

You do not need to card in individually at UT. Our setup and rules are a bit different, as are some of the cleanroom suit parts (no surgeon's mask or bouffant needed). 95% of our booties are not large clasped ones. Typically, gloves are the first thing you put on at UT. It minimizes getting your oils and flakes on the cleanroom suit.

Video 3 (Acid bench)

https://www.youtube.com/watch?v=Lg9U2PYqsC4&noredirect=1

Follow along with my notes for this video.

We have different hoods, but this video covers basics. We have open top fume hoods (this is the only place I remember seeing them). Around 3:30, the video touches on an important point about liquid leftover from the previous user; you cannot assume it's safe. This is just one reason why people not cleaning up after themselves is such an annoyance and also a practical and safety problem. We do not have a Ph test set as in the video. We tend to just douse the bench with a DI water sprayer, and then dry it well.

The user at 4:55 is making a mistake (mistake 1); do you know what it is? She makes another mistake at 5:28 (mistake 2). Also, she puts on the apron too quickly; this is only OK is it is new. Even then, you must check for any defects (holes, tears).

UT acid gloves get reused a few times. Always inspect them before use. If you don't trust them, or if they are the wrong size, get a new pair! The N2 gun inflation method shown in the video is questionable. Do you know why? However, the other method for checking the glove for pinholes is only a little better: You jiggle the glove while holding it open to get air into it, then twist the opening to trap air and slowly slide your hand down to see if any air is lost through the fingers or palm. The user has once again made a mistake she made earlier. Have you figured it out yet?

At 7:15 she handles an acid bottle with just gloves. At UT, the convention is to have full PPE on (apron, face shield, acid gloves) to transport acid bottles.

What does the user do wrong, again, from 7:20-7:37? Does 7:30-7:34 look safe? We remove gloves differently do to trying to resue them a few times. The user does remove the PPE in the correct sequence.

Skip from 9 minutes to 11 minutes. We don't have chemical warning forms, but you shouldn't be leaving an acid bench when using it.

HF is a particularly nasty chemical. It etches glass so I have the proper plastic labware for it. It can seep through your skin without any symptoms, and will then attack the calcium in your bones. Any potential HF exposure must be treated as if the HF has been absorbed; acid training will cover this. The user who demos pouring in the video contaminates the acid by wiping out the inside of the cap.

Disposal of chemicals and empty bottles is important, and will be covered in the official acid bench training. Our group does not store any chemicals. At 15:25 the user is handling an empty acid bottle without acid gloves, which is not safe.

Some of the training and rules concerning acid benches conflict a little, e.g. you cannot check acid gloves for pinholes without risking exposure through the N2 gun or acid glove palms. It is my goal to teach you the best practices, that accord as much as possible with the official training; there is no perfect procedure in the UT cleanroom (though better procedures could be implemented).

Video 4 (Plasmatherm PECVD)

https://www.youtube.com/watch?v=hgnpcTbgQTs

We do somethings differently, still a good overview.