IBM has also had serious problems with zinc whiskers in the past.
Recently the state of Colorado had a major problem caused by zinc-plated
computer raised floor growing whiskers that broke off and were pulled
into the electronics by the cooling air. The whiskers caused shorting
and system failures.
Best regards,
Andy Kostic
Andrew D. Kostic, Ph. D.
Engineering Fellow
Northrop Grumman
Electronic Systems
Product Integrity Engineering
(410) 765 6594
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of David Douthit
Sent: Friday, August 26, 2005 8:13 AM
To: [log in to unmask]
Subject: Re: [LF] Nuts and Bolts
Phil,
Have you experienced any issues with whiskers forming on that zinc
plated hardware?
NASA has had some serious problems with it.
David A. Douthit
Manager
LoCan LLC
Phil Nutting wrote:
>Our spec to our hardware vendor is either Zinc plating or stainless
>steel. Buying cadmium plated screws has been not allowed for at least
>the last 10 years at our facility.
>
>-----Original Message-----
>From: Leadfree [mailto:[log in to unmask]] On Behalf Of Michael McMonagle
>Sent: Thursday, August 25, 2005 11:51 AM
>To: [log in to unmask]
>Subject: Re: [LF] Nuts and Bolts
>
>Lots of inexpensive hardware and metal parts (like those used in
>consumer
>products) is cad plated, which doesn't sound homogeneous....
>
>Mike McMonagle
>Quality Engineer
>OYO Geospace
>7007 Pinemont Drive
>Houston, TX 77040
>713-986-8650
>
>
>-----Original Message-----
>From: Leadfree [mailto:[log in to unmask]] On Behalf Of Blair K. Hogg
>Sent: Thursday, August 25, 2005 10:24 AM
>To: [log in to unmask]
>Subject: Re: [LF] Nuts and Bolts
>
>Do any metal formulations commonly used in hardware contain cadmium?
>
>Blair
>
>
>
>>>>[log in to unmask] 08/25/05 10:23AM >>>
>>>>
>>>>
>Can you give a concrete example of a stainless steel that is not
>inherently free of "RoHS elements" to the specified limits? Doubtless
>you are thinking of hexavalent chromium. But alloyed metals cannot be
>said to have any valence; this exists only in compounds. They are also
>"homogeneous" (according to the definition), to boot.
>
>Brian
>
>Scott Hoeptner wrote:
>
>
>>How are different organizations dealing with obtaining compliance for
>>hardware "stock" items (ex: screws, washers, nuts, etc.)? It seems
>>that the vast majority of distributors of mounting hardware buys to
>>industry "spec" and cannot ascertain the true source of supply. For
>>example, they seem to take the position that stainless steel is
>>inherently free of RoHS elements. How can it be a safe bet when they
>>cannot identify specific manufacturer and chemical makeup? Any
>>thoughts?
>>
>>
>>
>>Thanks,
>>
>>Scott C. Hoeptner
>>
>>Vice President of Engineering
>>
>>HME
>>
>>phone: (858) 535-6036
>>
>>fax: (858) 535-6019
>>
>>[log in to unmask]
>>
>>
>>
>>
>
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