Scott,
DO NOT allow steel hardware to come into contact with aluminum.
The results are very destructive (rapid corrosion!).
David A. Douthit
Manager
LoCan LLC
Scott Hoeptner wrote:
>There is general agreement that for hardware, the safest bet in being
>RoHS compliant is to stick with "stainless steel." I'd like to hear
>what various companies are doing to appease their marketing groups when
>it comes to aesthetics and the use of "black" screws. Is there a
>reasonable solution? Oxidizing of stainless seems to give different
>results from different suppliers. Our history has shown that this
>process leads to corrosion. Thoughts? Alternatives?
>
>Best Regards,
>Scott C. Hoeptner
>Vice President of Engineering
>HME
>phone: (858) 535-6036
>fax: (858) 535-6019
>[log in to unmask]
>
>-----Original Message-----
>From: Leadfree [mailto:[log in to unmask]] On Behalf Of Genny Gibbard
>Sent: Thursday, August 25, 2005 1:41 PM
>To: [log in to unmask]
>Subject: Re: [LF] Nuts and Bolts
>
>For RoHS we are ordering only Stainless Steel. Many zinc coatings are
>not compliant, and it isn't worth the effort of trying to spec and track
>that metal process for fractions of a cent, at this point.
>Maybe when zinc RoHS options are more common, we'll go back, but my
>impression is many of the hardware sources we use are "RoHS?? what's
>that? It's going to cost you..."
>
>-----Original Message-----
>From: Leadfree [mailto:[log in to unmask]]On Behalf Of Phil Nutting
>Sent: 25-Aug-05 2:35 PM
>To: [log in to unmask]
>Subject: Re: [LF] Nuts and Bolts
>
>
>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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