Printer Friendly

XRF equipment and materials characterization for RoHS compliance: an evaluation of five systems showed broad performance differences.

Ed: For the complete article, visit

We selected two handheld and three desktop XRF spectrometers because of their main specifications, performance and cost. They are Vendor 1-D, Vendor 2-D, Vendor 3-D, Vendor 4-H and Vendor 5-H. We used this XRF equipment for Cpk, stability, Gage R & R, detection level versus acquisition time studies with 12 standard samples, and correlation studies with 11 production samples.

We found:

* Energy dispersive XRF is one of the more suitable analysis methods for parts screening because of its nondestructive, fast and efficient analysis.

* Each XRF has different accuracy levels for measuring banned substances. We suggest obtaining deviation (different) results for main elements of the XRF in order to learn which samples need to be sent to an outside laboratory for confirmation of RoHS compliance.

* In general, desktop XRF performed better than handheld XRF. However, the handheld XRF from Vendor 4 performed better than some desktop XRF. Table 19 summarizes the performances.

* Choose a reliable test laboratory for identifying samples that are inconclusive (in between the RoHS-compliant and noncompliant ranges).

* The experiment results listed are primary studies with XRF for RoHS enforcement. The results obtained from this evaluation showed the equipments' capability to quantify banned substances by RoHS initiative and demonstrated that XRF technique is a feasible testing method for manufacturing to perform quick verifications. However, a safety margin must be chosen to prevent equipment uncertainty from affecting final decisions.

* Despite the benefits of this technique, important limitations should be considered, such as the inability to quantify PBB, PBDE and chromium VI; the inability to detect banned substances in the inner part of a thick component/part; the inability to differentiate the banned substance contents of a nonhomogeneous component/part (the XRF result is a sum of different homogeneous materials), etc. A trial run is highly recommended to study effectiveness before final approval. Also, a well-trained operator is required to judge the results.

Ed.: This article was first published at Apex in February 2007 and is published with permission of the authors.

Hector Rene Marin Hernandez, RefugioVicente Escobedo Alva, Zhen (Jane) Feng, Ph.D., Joao Ofenboeck, and Murad Kurwa are with Flextronics International (;

Hector Rene Marin Hernandez, RefugioVicente Escobedo Alva, Zhen (Jane) Feng, Ph.D., Joao Ofenboeck and Murad Kurwa
COPYRIGHT 2007 UP Media Group, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2007, Gale Group. All rights reserved.

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:Comparing XRF
Comment:XRF equipment and materials characterization for RoHS compliance: an evaluation of five systems showed broad performance differences.(Comparing XRF)
Author:Hernandez, Hector Rene Marin; Alva, RefugioVicente Escobedo; Feng, Zhen (Jane); Ofenboeck, Joao; Kur
Publication:Circuits Assembly
Article Type:Reprint
Date:Sep 1, 2007
Previous Article:Still strong in Singapore: two decades after making its mark, Singapore remains an epicenter of manufacturing excellence. Here's why.
Next Article:Using AOI in the 01005 assembly process: a multiple inspection strategy improves detection without increasing false calls.

Related Articles
Optoelectronic substrates--will it happen? The economic model for the optoelectronic interconnect favors high data rate transmission over moderate to...
A familiar picture: Ibiden reigned (again) as the top PCB fabricator in 2006.
Nanotech final finish.
Multilayer design tool.
Growing at light speed: after a false start, OE is fast becoming a key differentiator for many new products.
Driving lean through the visual factory: visual instructions offer the simplicity employees need.
Iron and copper release in drinking-water distribution systems.

Terms of use | Privacy policy | Copyright © 2022 Farlex, Inc. | Feedback | For webmasters |