This was regard passivated zinc chromate plating on steel: there are two common classes, one is more durable in terms of cosmetic protection but results in very poor galvanic continuity between mechanically mating parts and thus is not suitable where EMI considerations are concerned. This class has a gold or yellow finish.
Spec for this type: UK: BRIGHT ZINC PLATE TO BS 1706 Fe/Zn 8 c 2C The other class which is much thinner and is suitable for steel enclosures where EMI is of concern is silver or "clear" in finish colour. Spec for this type is: UK: BRIGHT ZINC PLATE TO BS 1706 Fe/Zn 8 c 1A US: BRIGHT ZINC, ASTM B633, TYPE III, Fe/Zn 8 Chris James Engineering Services Manager Dolby Labs Inc. Wootton Bassett - Wiltshire - SN4 8QJ tel: 44 (0) 1793 842136 fax: 44 (0) 1793 842101 c...@dolby.co.uk http:\\www.dolby.com -----Original Message----- From: UMBDENSTOCK, DON [mailto:umbdenst...@sensormatic.com] Sent: Monday, November 30, 1998 8:21 PM To: 'EMC-PSTC Discussion Group' Subject: Coatings that affect EMC performance Hello Group, I remember recently (within the last quarter?) reading a thread about different coatings, one of which everyone said "don't use". I have searched through the RCIC "Recent Threads" and could not find a related subject. Can anyone steer me to that thread? (something about "yellow ____"?) Regards, Don Umbdenstock Sensormatic --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
