The bristles don't need to be grounded, just be non-static generating, like the metal handled, natural horsehair acid brushes we have been using. And, yes, our operators are grounded to the workstation. With regard to the test with ionizer, a lot of charge could be generated by a brush with, say nylon bristles, but the ionizer would immediately mask/dissipate the charge surrounding the action and make any possible measurement erroneous. The field measuring equipment would only see the ionized blanket and not the generated charge, no? The first test you suggest I believe, without ionizer, is all you need to determine a safe process. You'll also find that the presence of solvent, as opposed to a dry brush, prevents the accumulation of charge and makes it safe for even the most sensitive components. R. G. Blomberg Staff Production Engineer -----Original Message----- From: Cash, Alan [mailto:[log in to unmask]] Sent: Wednesday, February 23, 2000 12:26 PM To: [log in to unmask] Subject: Re: [TN] Anti static brushes You cannot ground insulative bristles, even if the handle of the brush is conductive. The operator must be grounded to the common ground of the work station. Use of an ionizer would be a help. Measure the static field generated by brushing a bare board with your cleaning solvent without the ionizer and then with the ionizer. You may find that the charge generated is not damaging to your most sensitive part on the board using the ionizer. Please refer to the newly released ANSI/ESD S20.20-1999 for more details. Al Cash -----Original Message----- From: Lee Whiteman [mailto:[log in to unmask]] Sent: Wednesday, February 23, 2000 7:39 AM To: [log in to unmask] Subject: Re: [TN] Anti static brushes If you are going to use a non static dissipative brush, we strongly recommend that your operators be grounded to earth ground and that an ionizer be present and in use at the workstation. Suggest you get a copy of ANSI / EIA-625: Requirements for Handling Electrostatic Discharge Sensitive (ESDS) Devices for your review. We also recommend that you know the sensitivity of your devices. For example, Class 0 devices are sensitive to 200 Volts or less. Bob Lawler Senior Design Engineer ACI / EMPF Telephone: (610) 362-1200; Ext. 222 FAX: (610) 362-1290 E-Mail: [log in to unmask] Lee Whiteman Senior Manufacturing Engineer ACI / EMPF Telephone: (610) 362-1200; Ext. 208 FAX: (610) 362-1290 E-Mail: [log in to unmask] -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Michael D. Doty Sent: Tuesday, February 22, 2000 3:25 PM To: [log in to unmask] Subject: Re: [TN] Anti static brushes These are commonly refered to as solder brushes. They are putting on the flux paste prior to sweating pipes. Mike Doty ______________________________ Reply Separator _________________________________ Subject: Re: [TN] Anti static brushes Author: "Blomberg; Rainer (FL51)" <[log in to unmask]> at smtplink-hadco Date: 2/22/00 3:09 PM Chris, We use very inexpensive metal-handled acid brushes with bristles cut down to approx. 3/8 inch. We have been using them for years. Nearly any production tool supply house has them. R. G. Blomberg Honeywell - Space Systems Staff Production Engineer -----Original Message----- From: Christopher Murphy [mailto:[log in to unmask]] Sent: Tuesday, February 22, 2000 2:51 PM To: [log in to unmask] Subject: [TN] Anti static brushes Dear All, we currently use static dissipative brushes for cleaning wasted chips off our placement machine feeder bases, and we also use them with a solvent for cleaning localised areas of boards when rework has been carried out. The problem is that they are very expensive, so does anyone know of any sources of reasonably inexpensive brushes? I have seen other companies use wooden handled paint brushes with the bristles cut down for these purposes - I assume this is not a good thing due to the bristles not being ESD safe ? Thanks in advance for any replies. Chris Murphy, Tait Electronics, New Zealand ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. 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