LISTSERV - LEADFREE Archives - LISTSERV.IPC.ORG

LEADFREE Archives

August 2005

Leadfree@IPC.ORG

	LISTSERV Archives
	LEADFREE Home
	LEADFREE August 2005

	Log In
	Register

	Subscribe or Unsubscribe

	Search Archives

Options:	Use Monospaced Font Show Text Part by Default Show All Mail Headers
Message:	[<< First] [< Prev] [Next >] [Last >>]
Topic:	[<< First] [< Prev] [Next >] [Last >>]
Author:	[<< First] [< Prev] [Next >] [Last >>]

Subject:	Preferred Tg rating for PCB and Cost implications
From:	to Paul Taylor <[log in to unmask]>
Reply To:	(Leadfree Electronics Assembly Forum)
Date:	Thu, 25 Aug 2005 10:38:54 +0100
Content-Type:	text/plain
Parts/Attachments:	text/plain (41 lines)

Hi All

We are looking at specifying a Higher Tg rated material for our PCB
laminates, currently we use Tg 120 to Tg 140 for 'leaded' production.  We
intend to use Tg 170 for our lead free production, however our
sub-contractor says that he could use Tg 155
The data that I have points to a greater  reliability with Tg 170 (our
equipment is predominantly in market for 10 years) and we have seen data
on delamination over time of low rated laminates in the higher rated
temperatures, however on the other hand we are being pushed for a 15-20%
increase in the bare PCB cost to use Tg 170 (it looks like laminate cost
is up 15% per square foot).  Its probably a short term blip on cost until
the major laminate suppliers get on board with volume production of the
higher Tg material, but I was wondering if any of you had any views,
recommendation or experiences, my questions go along the lines:

1) what do we think the industry standard Tg rating will be
2) are there any lower cost, lead free temperature profile compliant
laminates in development
3) are these cost implications both normal and justified for the short
term
4) is there a different view on Tg rating between US/UK and Asia

regards

Paul
Paul R Taylor
Senior Engineer, RoHS Compliancy Group, IED
Pitney Bowes Ltd
The Pinnacles, Elizabeth Way, Harlow, Essex, CM19 5BD
tel: +44 1279 449 744      fax +44 1279 449 594

-------------------------------------------------------------------------------Leadfee Mail List provided as a service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Leadfree
To temporarily stop/(start) delivery of Leadree for vacation breaks send: SET Leadfree NOMAIL/(MAIL)
Search previous postings at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-------------------------------------------------------------------------------
email: [log in to unmask]         website: www.pb.com

ATOM RSS1 RSS2

LISTSERV.IPC.ORG