A good place to look at recent IPC documents for status is
http://www.ipc.org/html/revstat1.htm, there you will find that IPC-233A was
superceded by IPC-FC-232.

The old 233 says the 233/1 refers to specification sheet 1, M is adhesive
type (acrylic).  23 translates to 2  unsupported film 2 mils thick per para
1.2.1.7 and the last 3 means class 3 - high reliability.  The zeros in
between mean there is no call out for:
supporting dielectric film
reinforcement method
reinforcement type
supporting dielectric film.

IPC-FC-233A/1 says it is flexible adhesive Bonding film (acrylic)  Material
designation 000M and gives the required properties, the tests, and methods
of test.

> -----Original Message-----
> From: Duckworth Randy CIV WRALC/LYPME [SMTP:[log in to unmask]]
> Sent: Wednesday, August 11, 1999 9:42 AM
> To:   [log in to unmask]
> Subject:      [TN] Adhesive per IPC-FC-233
>
> Technetters,
>
>      This is my second attempt to send this message, so I hope you don't
> get
> two copies.
>
>       I have a drawing dated 1984 that references an adhesive per
> IPC-FC-233/1 0000M23.  I believe this to be a two mil thick acrylic
> adhesive
> sheet, but I have not been able to confirm this.  Also, can anyone tell me
> what current IPC spec covers this type of adhesive?  Thanks in advance!
>
> Randy Duckworth
> Process Engineer
> Robins AFB, GA
>
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