Doug-

I'm not sure if the posting below was solicited or not, but many of us
sure do appreciate this type of informational posting, as the anxiety
builds over losing the MIL-P-13949 security blanket.

As I write this, I'm finally printing out the 150+ pages of IPC-4101,
hoping to gain some familiarity with it before I'm compelled to use it.

Regards,

Michael Alderete
> ----------
You wrote...
> ------------------------------
>
> Date:    Fri, 18 Sep 1998 17:59:16 -0400
> From:    Doug Sober <[log in to unmask]>
> Subject: Cancellation of MIL-S-13949H
>
> isola USA
> 100 Tillessen Blvd.
> Ridgeway,  SC  29130
> +1-803-337-4000
> +1-803-337-8821 fax
>
> 20 July 1998
>
>
> To:             Isola USA Customers
>
> Subject:        Conversion to IPC-4101 from MIL-S-13949H
>
>
> As of 30 November 1998, MIL-S-13949H will be canceled by the Defense
> Supply Center Columbus (DSCC).  This means that all references to
> MIL-S-13949 must be removed from labels, certificates of compliance,
> part numbers and other pertinent drawings relative to base materials
> and
> printed boards.  At that time isola USA will only issue certificates
> of
> compliance for IPC-4101 which was published December 1997 by the
> IPC.=20
> Isola USA will not be able to certify any base materials to
> MIL-S-13949H
> after the 30th November date.
>
> Our understanding of the DSCC policy is the 30 November 1998 timeline
> is
> on a "point of sale" basis.  Materials manufactured before this date
> but
> certified after 30 November will still only carry the IPC-4101
> certification.  Materials shipped from distribution warehouses after
> 30th November 1998 will have the MIL-S-13949H reference, the Cage Code
> and the Qualification Reference Number (QRN) crossed off and IPC-4101
> inserted on certificates of compliance and master box labels. =20
>
> From a customer viewpoint, the quality levels of base materials
> shipped
> will not be affected by this certification change since the
> performance
> requirements of IPC-4101 are equal to or more stringent than
> MIL-S-13949H.  Isola USA still plans to conduct what is the equivalent
> of Group A, B and C inspection on laminates and prepregs as directed
> by
> IPC-4101 and our Quality Management Team (QMT).  All new product
> grades
> not previously listed on a MIL-S-13949H Qualified Product List (QPL)
> will be qualified at an independent test laboratory and the data
> readily
> available for review.
>
> I have attached a summary of some of the differences between the two
> specifications as well as a template letter for you to use with your
> customers.  If you have any questions concerning IPC-4101, please call
> me directly at 803-337-4203 or fax me your questions at 803-337-8821.
>
>
> With kind regards,
>
> Douglas J. Sober
>
> Corporate Director of Quality
>
>
>
>
>
> SIGNIFICANT DIFFERENCES BETWEEN
> MIL-S-13949H AND IPC-4101
>
>
> General Information Differences
>
> Prepregs and laminates are on the same slash sheet.
>
> Slash sheets are organized by "families" with open spaces for new
> materials that fit the family concept.
>
> The entire specification is in metric with no English references.
>
> The latest test methods are attached to the document.=20
>
>
> Paragraph 1.2.2
>
> Laminates can be ordered as a dielectric space (without copper) or as
> an
> overall thickness (including copper) foil.  Currently laminates can
> only
> be ordered as a dielectric space.
>
>
> Table 1
>
> The copper foil table now includes type "R", reverse treated
> electrodeposited for grade 1 and type "S" for reverse treated
> electrodeposited for grade 3.
>
>
> Paragraph 1.2.5 and 3.8.3.1.2
>
> Surface Quality Class now includes a "D" designation which provides
> the
> most stringent surface quality call-out.  No pits, dents or epoxy
> spots
> over 5 mils.  MIL-S-13949H has "B" as the tightest class which allows
> 1
> pit up to 15 mils.
>
>
> Paragraph 1.2.7
>
> Prepregs are ordered using 3 parameters, resin content, resin flow,
> and
> the "optional" parameter.  Prepreg can be tested by new test methods
> such as rheology, % Cure, or delta.
>
>
> Paragraph 3.1.2
>
> Quality Conformance Testing is conducted as determined by the
> Manufacturers Quality System as outlined in IPC-PC-90.  In the absence
> of a Manufacturing Quality System, conformance testing is conducted at
> the same frequency as MIL-S-13949H.=20
>
>
> Paragraph 3.1.5, and 3.3
>
> Self declaration form IPC-LQP-1730 is a prerequisite to certifying to
> IPC-4101.  The document IPC-LQP-1730 will be published by the IPC at
> the
> same time as the IPC-4101 specification.=20
>
>
> Paragraph 3.1.7 and 3.4
>
> Qualification testing must be conducted by the supplier at any
> IPC-QL-653 approved laboratory.  The qualification data must be
> summarized and readily available for review.  The qualification
> testing
> regime is the same as prescribed by MIL-S-13949H.
>
>
>  Paragraph 3.4.1
>
> A thin laminates specimen 10 mils or less qualifies all thin laminates
> (30 mils and less).  A thick laminate specimen greater than 30 mils
> qualifies all thick laminates. =20
>
>
> Paragraph 3.4.2
>
> For a given slash sheet, the thinnest prepreg qualifies all the
> thicker
> prepregs.
>
>
> Table 5
>
> Table 5 now includes Delta Tg and Average X/Y CTE as optional tests.
>
> In the absence of a Manufacturers Quality System, the frequency of
> testing is the same as MIL-S-13949H.
>
> The test method for flammability has been changed from the "MIL"
> method
> to the standard UL method 94.
>
>
> Table 6
>
> Electrical tests and some environmental tests are performed on
> prepregs
> after pressing into a thin laminate.
>
> Prepreg testing for flammability is only conducted as a thin laminate
> specimen.
>
>
> Paragraph 3.9.1.1
>
> Peel Strength is called out as a single value for 35 micron foil.
> Foil
> weights greater than 35 micron must meet the required value for 35
> micron.  Foils less than 35 micron may be plated up to 35 micron and
> tested as is the current specified procedure in MIL-S-13949H.
>
>
> Paragraph 3.9.1.2
>
> Dimensional stability is now specified as a nominal value with a
> tolerance range.  The supplier must provide the nominal value for
> dimensional stability for each construction.  Currently the
> MIL-S-13949H
> specification uses zero as the nominal value.  IPC-4101 will reward
> consistency of dimensional movement.
>
>
> Paragraph 3.9.2.2.6
>
> Gel Time is an optional test.  It can be replaced with other
> characterization tests if desired such as rheological flow, Cure % or
> Delta H.
> =20
>
> Paragraph 3.9.2.2.8
>
> Volatile Content is an optional test.
>
>
> Paragraph 3.10.2.3
>
> Dicy Crystals is an optional test.
>
>
> Paragraph 3.15
>
> MSDS forms must be available for materials supplied under this
> specification.
>
>
> Paragraph 5.2
>
> The supplier is responsible for establishing written guidelines for
> their authorized distributors. =20
>
>
>
> Template Letter
> (To be used by the printed circuit shop to their customer)
>
>
>
> (Name of the contact at your Customer)
> (Your Customer's name)
> (Your Customer's business address)
>
>
> Dear =85=85.,
>
> As you may be aware, MIL-S-13949H and its associated Qualified Product
> List (QPL) will be canceled as of 30 November 1998.  The Defense
> Supply
> Center Columbus (DSCC) communicated the cancellation in a letter from
> David M. Moore dated 11 June 1998.  By definition from the personnel
> at
> DSCC, cancellation means that (your name) will not be able to purchase
> laminates and prepregs certified to MIL-S-13949H any longer.  Our
> current suppliers of base materials have informed (your name) that
> certificates of compliance and related paperwork will only reflect
> IPC-4101, a base materials specification developed by industry experts
> within the IPC and published in December 1997 after the cancellation
> date.
>
> From our viewpoint, the quality levels of base materials received by
> (your name) and shipped to (your Customer's name) will not be effected
> by this certification change as the requirements of IPC-4101 are equal
> to or more stringent than MIL-S-13949H.
>
> In preparation for this change, (your name) would like the purchasing
> information and drawings of (your Customer's name) to now reflect
> certification to IPC-4101 in place of MIL-S-13949H.  At the very least
> we request a letter from (your Customer's name) indicating that you
> accept the IPC-4101 replacement of MIL-S-13949H for certification
> purposes.
>
> The conversion to IPC-4101 is a few short months away.  We need to
> start
> working together now to prevent confusion on 30 November 1998.
>
> Please contact me at your earliest convenience at (your telephone
> number).
>
>
>
> Sincerely yours,
>
>                 =09
> (your name)
> (your title)
>
>

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