Technical Library: chemical and flux (Page 1 of 5)

Function and Operational Theory of Condenser Tube Flux Collection System

Technical Library | 2023-01-17 17:50:59.0

Heller's new Condenser Tube Flux Recovery System is designed to provide more efficient flux collection than earlier Heller flux collection systems; while providing minimal down time for inspection and cleaning. The entire system easily fits within the rear of the top shell of an 1800-EXL oven. The system utilizes a different set of top shell caps specially designed to provide the best serviceability of both the flux collection system and maintenance of the heater zone blower motors.

Heller Industries Inc.

The Nature of White Residue on Printed Circuit Assemblies

Technical Library | 1999-05-07 10:47:00.0

White residue remaining after cleaning circuit board assemblies can be caused by a variety of chemicals and reactions. Rosin and water-soluble fluxes, circuit board resins and epoxies, component materials and other contamination all contribute to this complex chemistry. This paper discusses many of the sources of the residues that seem to be an ever-increasing occurrence.

Kester

VOC-Free Wave Solder Flux Evaluation

Technical Library | 1999-04-26 15:51:30.0

The goal of the flux evaluation was to identify one product that would meet the needs of all SICN's wave solder products and processes while producing high quality assemblies. At the outset of the evaluation, it was unclear whether a single flux chemistry could satisfy such a broad range of demands, particularly because SICN's utilization of less aggressive, low-impact chemicals.

Siemens Process Industries and Drives

Contamination Profile of Printed Circuit Board Assemblies in Relation to Soldering Types and Conformal Coating

Technical Library | 2017-12-11 22:31:06.0

Typical printed circuit board assemblies (PCBAs) processed by reflow, wave, or selective wave soldering were analysed for typical levels of process related residues, resulting from a specific or combination of soldering process. Typical solder flux residue distribution pattern, composition, and concentration are profiled and reported. Presence of localized flux residues were visualized using a commercial Residue RAT gel test and chemical structure was identified by FT-IR, while the concentration was measured using ion chromatography, and the electrical properties of the extracts were determined by measuring the leak current using a twin platinum electrode setup. Localized extraction of residue was carried out using a commercial C3 extraction system. Results clearly show that the amount and distribution of flux residues are a function of the soldering process, and the level can be reduced by an appropriate cleaning. Selective soldering process generates significantly higher levels of residues compared to the wave and reflow process. For conformal coated PCBAs, the contamination levels generated from the tested wave and selective soldering process are found to be enough to generate blisters under exposure to high humidity levels.

Technical University of Denmark

Flux Collection and Self-Clean Technique in Reflow Applications

Technical Library | 2008-05-14 15:44:58.0

This paper will review some basic past and present flux chemistries that affect flux collection methodology. It will also review some of the most common flux collection methods, self-cleaning techniques, and maintenance goals. And, finally, data will be presented from high volume production testing of an advanced flux management system.

Speedline Technologies, Inc.

Best Practices in Selecting Coatings and Pottings for Solar Panel Systems; Junction Boxes and Inverters

Technical Library | 2020-08-13 01:12:57.0

The solar industry has driven solutions that result in electronics systems that are required to perform in outside environments for over 25 years. This industry expectation has resulted in solutions to protect the electronics from failure that can result from interaction with moisture, and various chemicals leading to corrosion and shorting of the systems. Potting and encapsulation compounds can impart the very high level of protection from environmental, thermal, chemical, mechanical, and electrical conditions that the solar applications demand.

DfR Solutions (acquired by ANSYS Inc)

Manufacturing Considerations When Implementing Voc-Free Flux Technology

Technical Library | 1999-05-07 11:44:26.0

In 1990 the United States Environmental Protection Agency Issued the Clean Air Act. The Clean Air Act and subsequent amendments are designed to limit the use of chemicals that contain volatile organic compounds (VOCs). The document goes into great detail setting limits for allowable VOC emissions for different industries.

Kester

BTC and SMT Rework Challenges

Technical Library | 2019-05-22 21:24:05.0

voidless treatment Smaller components -> miniaturization (01005 capability) Large board handling -> dynamic preheating for large board repair Repeatable processes -> flux and paste application (Dip and Print), residual solder removal (scavenging), dispensing, multiple component handling, and traceability Operator support -> higher automation, software guidance

kurtz ersa Corporation

Different Types of Pressure Transmitters, Working Principle, and How to Select Pressure Transmitter

Technical Library | 2021-11-25 01:24:20.0

Pressure transmitter is a kind of pressure measuring instrument widely used in many transmitters. It is widely used in petroleum, chemical, metallurgy, food, electric power, medicine, papermaking, textile and other industries. It is mainly used to detect the differential pressure, pressure, absolute pressure and liquid level of fluid.

OKmarts Industrial Parts Mall

Materials Compatibility and Aging for Flux and Cleaner Combination

Technical Library | 2016-05-30 22:54:52.0

New engineered cleaning and defluxing agents promise great improvement in cleaning and reliability for electronic assemblies. As complexity grows and dimensions shrink in high reliability electronics, the need for materials compatibility and effectiveness in cleaning and rinsing is vital.

Sandia National Laboratories

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