We let three different persons perform the Scotch 600 test on thickfilm gold 
on LTCC.  The samples were all run in one batch. We got three variations on 
the test, depending on how the tape was pressed on, what pull angle was used 
and with what speed the tape was pulled.  One guy pulled off nearly all the 
strings and pads. Strings were 0.04 x 1.00 inch and pads were 0.1 x 0.1 
inch. Very subjective, as you said.  We have abandoned the  test and go for 
soldered pins on 0.1x 0.1 inch pads and use a Sebastian pull tester instead.

Inge

PS. Nowadays, we need not worry much about the adhesion. So, we have a whole 
big box with 600 tape reels, which will probably end in everyone's drawer.

----- Original Message ----- 
From: "Peter Swanson" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, September 02, 2009 6:06 PM
Subject: Re: [TN] Adhesion tape test


Lamar,

The (possibly apocryphal) tale about the adhesive strength required when
one of these adhesive tape tests was being written is that the engineer
concerned took a roll of conventional stationery Sellotape (translation
= Scotch tape)  from his desk drawer and decided that that would
suffice.

As this is a reasonably crude go/no-go test with some subjectivity to
it, it might be OK to try the same!

Regards,
Peter
--------------------------------------------------------
Peter Swanson           [log in to unmask]
INTERTRONICS               http://www.intertronics.co.uk
Tel: +44 1865 842842                Oxfordshire, England

INTERTRONICS is dedicated to providing quality material, consumable
and equipment solutions to the high technology, high performance
assembly industries, incorporating outstanding levels of technical
support and customer service.

Read our news! http://www.intertronics.co.uk/blog/blog.htm

INTERTRONICS is the trading name of Cygnet Electronics Ltd,
registered in England No 1835617. Registered office:
17 Station Field Industrial Estate, KIDLINGTON, Oxfordshire, OX5 1JD,
ENGLAND.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lamar Young
Sent: 02 September 2009 16:50
To: [log in to unmask]
Subject: [TN] Adhesion tape test

I need help finding a suitable replacement tape to perform adhesion
testing per ASTM D3359, the tape test method.

The Permacel 99 tape that was mentioned is no longer available.  We have
tried a replacement tape recommended by a tape vendor, but the backing
released from the adhesive during the test (the adhesive stuck better to
the substrate than the backing).

Any help would be much appreciated.

Lamar

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