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Subject:
From:
Joyce Koo <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Joyce Koo <[log in to unmask]>
Date:
Wed, 28 Dec 2011 22:26:01 +0000
Content-Type:
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Yap. Raining chocolate from your reflow oven is not good. 
--------------------------
Sent using BlackBerry


----- Original Message -----
From: Terry Munson [mailto:[log in to unmask]]
Sent: Wednesday, December 28, 2011 02:20 PM
To: [log in to unmask] <[log in to unmask]>
Subject: Re: [TN] Oven contamination

From a metallurgical standpoint there is  no cross contamination but we have seen flux residues condensing in the vent stacks and drip back on the board surface (we refer to it as orange duck sauce). This residue is very corrosive. With the thermal differences between leaded and lead free the venting is important to check. I know this is not the answer to your original question but is important to investigate.  

Terry Munson 
Foresite 
765-457-8095


On Dec 28, 2011, at 1:04 PM, Reuven Rokah <[log in to unmask]> wrote:

> Lead free oven can be used for Sn/Pb oven but Sn/Pb oven some time cannot
> be used for Lead free process because of lake of power / control etc.
> Reuven
> 
> On Wed, Dec 28, 2011 at 7:57 PM, Stadem, Richard D. <[log in to unmask]>wrote:
> 
>> No, it does not. The use of the same equipment to process both (or
>> various) alloys is done on a regular basis worldwide. I even know of
>> situations where the same stencil/squeegee is used for both RoHS and leaded
>> versions of a particular product. Of course, they are thoroughly cleaned
>> and inspected between runs. Both products are run through the same wash
>> process as well, in the industry this is a common practice.
>> Could there be an individual renegade solderball entrapped somewhere of
>> the wrong alloy? Possibly.
>> Does that constitute a violation of RoHS? No, it is not more than .05% of
>> any solder joint.
>> 
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Keith Calhoun
>> Sent: Wednesday, December 28, 2011 7:38 AM
>> To: [log in to unmask]
>> Subject: [TN] Oven contamination
>> 
>> We were recently asked a question by one of our customers that I didn't
>> have an answer to.
>> Does the use of a common reflow oven for leaded and RoHs products result
>> in any cross contamination of these products.
>> On first glance I would have just said no, that isn't an issue, but I
>> want to know if anyone else has ever looked into this in any detail.
>> 
>> Thanks for all the support;
>> 
>> Keith S. Calhoun
>> Manufacturing Engineering Manager
>> Sopark Corporation
>> 3300 South Park Avenue
>> Lackawanna, New York 14218
>> 716-822-0434 Ext. 237
>> [log in to unmask]
>> 
>> 
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> 
> 
> 
> -- 
> 
> Best Regards,
> 
> *Reuven Rokah*
> 
> Mobile: 972-52-60-120-18
> Tele-fax: 97239360688
> <http://www.rokah-technologies.com/>[log in to unmask]
> [log in to unmask]
> www.rokah-technologies.com
> 
> **
> This e-mail message is intended for the recipient only and contains
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> 
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