Wayne,

Solithane 113 is a pre-polymer as stated on the TDS
http://www.spolymers.com/pdf/Solithane_113.pdf

This material will cure slowly in the presence of moisture from the
ambient humidity.  Depending upon your factory set-up, you may see
variations in the humidity (lower than in the summer?), which coupled with
a greater thickness than usual would retard the cure time.  I am going to
go out on a limb since the manufacturer recommends the use of either amine
or polyol curatives that this material is not catalysed an so the moisture
cure reaction will be very slow.

If you use this material as a 2K system, then you need to ensure the mix
ratio, since this determines the final film properties, and the hardness
can range from A15 to D60 (which is a huge range).  The Tg of the coating
will also vary considerably over this range, which may result in you
having a softer film than you are used to, lower Tg etc, so your coating
may be 'stickier' than you are used to.

Feel free to share more details about your process if you like, I'll
assume you have been using this coating for a while and so, unless you
have changed your ESD bags recently, I'd bet something in your process has
changed, leading to the appearance of this 'new'issue.

Best Regards,

Phil.

+44 7703 795422

On 27/10/2011 22:11, "Douglas Pauls" <[log in to unmask]> wrote:

>In addition Wayne,  if the boards are being put into the bags directly
>after a heat-based cure (e.g. oven) and you do not allow them to cool to
>room temperature first, the coating will stick to the bags.  Check to see
>when your operators are putting the assemblies into the bags and make
>sure 
>they are not shortcutting the cure process.
>
>Doug Pauls
>
>
>
>Phil Bavaro <[log in to unmask]>
>Sent by: TechNet <[log in to unmask]>
>10/27/2011 03:58 PM
>Please respond to
>TechNet E-Mail Forum <[log in to unmask]>; Please respond to
><[log in to unmask]>
>
>
>To
><[log in to unmask]>
>cc
>
>Subject
>Re: [TN] ESD packaging material issue
>
>
>
>
>
>
>Wayne,
>
>Something doesn't sound right here.  Solithane S-113 is a polyurethane
>and 
>my experience is that fully cured urethane does not normally stick to the
>static dissipative interior of a multilayer ESD shielding bag.
>
>I would check to ensure that the conformal coating is fully cured before
>it gets put into the bag.
>
>I'll admit I haven't ever used Solithane S-113 and had a hard time
>finding 
>the data sheet.  Uniroyal was the manufacturer on the only archived
>datasheet I could find but the current website eluded me.
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of E-Mail Forum Wayne
>Knapp
>Sent: Thursday, October 27, 2011 1:13 PM
>To: [log in to unmask]
>Subject: [TN] ESD packaging material issue
>
>Hi Technetters,
>I could use your help resolving an issue I?m having with the ESD bags
>that 
>we are currently using for packaging. The ESD bags are sticking to the
>conformal coating (Solithane S-113) on the CCAs that are placed in the
>bag. We cannot change the coating that is used on the CCAs, so we are
>looking for ESD safe packaging bags that will not stick to the CCAs. Does
>anyone know if there is an ESD bag (material) that would not stick to the
>CCAs?  Any help identifying a suitable ESD bag material and supplier
>would 
>be appreciated.
>Thanks,
>Wayne
>
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