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SMTnet Express February 7, 2013, Subscribers: 26168, Members: Companies: 13281, Users: 34286

Technical Library

Effect of Silicone Contamination on Assembly Processes

Silicone contamination is known to have a negative impact on assembly processes such as soldering, adhesive bonding, coating, and wire bonding. In particular, silicone is known to cause de-wetting of materials from surfaces and can result in adhesive failures. There are many sources for silicone contamination with common sources being mold releases or lubricants on manufacturing tools, offgassing during cure of silicone paste adhesives, and residue from pressure sensitive tape. This effort addresses silicone contamination by quantifying adhesive effects under known silicone contaminations. The first step in this effort identified an FT-IR spectroscopic detection limit for surface silicone utilizing the area under the 1263 cm-1 (Si-CH3) absorbance peak as a function of concentration (µg/cm2). The next step was to pre-contaminate surfaces with known concentrations of silicone oil and assess the effects on surface wetting and adhesion. This information will be used to establish guidelines for silicone contamination in different manufacturing areas within Harris Corporation.

First published in the 2012 IPC APEX EXPO technical conference proceedings.

by: John Meyer, Carlyn A. Smith, Ph.D.; Harris Corporation

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Forum search results for related keywords: surface contamination, silicone, FT-IR, wetting

SMT / PCB Products

NC258 Lead-Free
Solder Paste
NC258 Lead-Free & Tin-Lead Solder Paste

Best-in-Class pause-to print capabilities...

by: AIM Solder

S-910N Series
Fluid Dispensers S-910N/S-912N Fluid Dispensing Systems

Ideal for inline, high volume applications...

by: Asymtek

ProtoMat Series
PCB Milling Machine
ProtoMat Series PCB Milling Machine

State-of-the-art rapid PCB prototyping...

by: LPKF Laser...

X5 Professional
Screen Printer X5 Professional Screen Printer

High-performance printer...

by: ASYS Group

FX Series
AOI System
FX Series AOI

Automated in-line PCB inspection...


Aqueous Cleaning... AQUANOX A4241

Effective on the toughest...

by: Kyzen

Mark5 Series -
Reflow System
The Mark III Reflow System

Up to 40% reduction in nitrogen consumption...

by: Heller

Stencil Printer
SP700avi Inline Stencil Printer

Utilising the most advanced drive...

by: Speedprint

SMT / PCB Equipment Auctions

Masterwork Electronics Continued Operations - SMT Assembly Equipment

February 25 - 27

auction by: Cardinal Circuit Auctions

Cardinal Circuit - Equipment Auctions

Electronic Equipment Mart

Speedline UltraFlex...
Screen Printer
Speedline UltraFlex 3000 Screen Printer

IBE SMT Equipment

all marketplace listings

Crown Simplimatic
Reflow Exit Conveyor
Crown Simplimatic Reflow Exit Conveyor


all marketplace listings

Vitronics DELTA C...
Wave Solder...
Vitronics DELTA C 6721CC Wave Solder


all marketplace listings

Europlacer iineo ii
Pick and Place...
Europlacer iineo ii Pick and Place


all marketplace listings

Internet Marketing tip of the week

Control Your Description in Search Engines

Most of you know that getting your website on the first page of Google search results is quite important. However, when you accomplish this, you aren't done yet.

Now you need to make sure your website listing is clicked instead of the other results on the page. How do you accomplish this?

  1. We know the first five results on the page are clicked most often; therefore, strive to be in the top 5.
  2. Control your description in the search results. The description of your website in the search results can come from a few places:
    • Meta Description tag on your webpages - This is the best way to control what the user sees in the search engine results. If you right click on your webpage and choose 'view source' you should see a tag that looks something like:
    • Information that search engine spiders 'read' on your page. If there is no meta description in your website's code and if you don't have anything in the Open Directory Project then search engines will use information that they retrieve when spidering your website. This may cause your description to be much less enticing.
    • Open Directory Project - If your description in the search results comes from the Open Directory Project and you don't want that to appear, you can use the following meta tag in your code:
      <meta name="robots" content="NOODP" />
  3. Now that you are in control of what searchers see in the search results, you can try different messages to see what works best. Your meta description should be at least one full sentence and offer a specific solution to a specific problem. Make the user feel comfortable that your solution will solve his/her problem and you will get the click...

Roland Girouard, Managing Director, SMTnet

The marketing team provides internet marketing consulting services for the SMT Industry.

Contact us for more information »

Events Calendar

Cleaning Before Conformal Coating - Free Online Webinar
Feb. 14.

APEX Expo 2013
Feb. 19., San Diego, CA, USA

Career Center


SMT Equipment/Pick & Place Programmer

Huntington Beach, CA, USA | TRANTRONICS, INC.

Senior Customer Service Engineer


Field Service Technician

Madison, WI, USA | ASM Assembly Systems


Process Engineer

San Diego, CA, USA

Electronic Process Engineer

Brampton, Orlando, Canada

SMT Process Engineering Specialist

Kitchener, Ontario, Canada

Industry Associations Events


SMTA - Surface Mount Technology Association is a non-profit international association of companies and individuals (totalling 4,000) involved in all aspects of advanced electronics assembly, surface mount and related technologies. Membership Info | SMTA Certification | Bookstore

Next Event: Webtorial - Soldering Reliability Issues for the 21st Century - February 12 & 26


IPC - Association Connecting Electronics Industries is a US-based trade association dedicated to the competitive excellence and financial success of its nearly 2,600 member companies which represent all facets of the electronic interconnection industry, including design, printed wiring board manufacturing and electronics assembly. Membership Info | Training & Certification Programs | Standards & Publications - Online Store

Next Event: CID+ Certified Interconnect Designer � Advanced Workshop & Exam in conjunction with IPC APEX EXPO - February 15 - 17

Technical Editor - Davef (submit your technical articles)

Newsletter Editor - Anna Girouard, 98 Elm Street, Portland, Maine 04101 USA, Tel.207-780-0887.

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Capital Equipment Exchange - Used PCB Assembly Equipment

Zestron - cleaning products for the SMT industry

Unisoft Software for SMT Placement

Valor MSS Process Preparation

PCB Equipment Auctions

ii-Feed tape feeding solution for Europlacer machines

Europe's No. 1 source for pre-owned SMT equipment

The Mark III Reflow System

NexJet jetting technology

AIM Solder Paste

Nordson Yestech - AOI Solutions

PCB Depaneling

IPC Apex Expo 2013

IBE - Used SMT Equipment

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