Mike, In addition to agreeing with Eric's employee comments I would like to offer a few other observations on the subject. The majority of shops that produce .008 mil lines/spaces that I have seen, do not have controlled 'clean' rooms. I have also been in at least two shops that boasted of .003 mil capability that had NO clean room or even positive pressure in the imaging areas. In both cases when ask about production yields, prerehearsed 'tap dance' answers were given. Neither shop knew or was willing to share their actual shop defect rates based on the their lack of air born contamination control in the imaging areas. I have also seen many shops with what was advertised as a clean room but noticed there was no positive pressure. Basically, from a sales point they look cool but without enough positive pressure to keep out contaminates from the other processes, both chemical and dust, the actual 'clean' value of the room is near zero. In my opinion, considering your .008 requirement description, I would steer away from using a class "100K Clean Room" title by procedure. If you do, some auditor will want to see your Mil testing proof. I don't believe you need to go through that. A more practical approach would be to write your procedure to specify/control the items you mentioned (since they are already in place) with one addition. In this procedure close your control loop by including the MRB function. Have your production defects reviewed daily/weekly by MRB. A minimum effort by your MRB group should be able to easily identify defects caused by imaging contamination. Simply tracking these defects will have many benefits. It will document the quality capability of your imaging process. It will provide justification for any needed improvements. It can demonstrate the 'no added value' of any steps that you have deleted. It will also serve to impress the auditors that your actually do monitor your image process quality and follow your procedure. This approach will allow you to fine tune your 'clean' room to fit the quality needs of your other processes without over kill. Norm Dill ---------- From: E.Janssens@MT0004 To: [log in to unmask] Subject: FAB: IMAGE ROOM CLEANLINESS Date: Friday, October 11, 1996 3:18AM In-Reply-To: The letter of Friday, 11 October 1996 02:20 Dear Mike, Based on my experience with reduced dust level enviroments for plotter rooms I want to make a non technical remark. Dust levels are reduced by acting on 3 levels: dust generation prevention, dust entrance prevention and dust removale. Every clean room systems supplier can offer you technical solutions. But the system is only as good as it is used. The best systems can be ruined by the operators. The people are the biggest and most unpredictable dust source. I suggest you concentrate more on people and their behaviour. Some suggestions: - make a clean programme and have it respected - no food and beverage in the yellow room - no papers or magazines - have operators wearing a headcap (and gloves?) as a reminder that they are in a clean room A good discipline in a good enough enviroment will bring you more than an expensive clean room manned by careless operators. Success Eric Janssens *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************