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PDBE and PBB replacements???

jdumont

#33179

PDBE and PBB replacements??? | 11 March, 2005

Looking for some info on these two substances. Are there any suitable replacements for these? How prevalent are they in the mfg of PCBs and harnesses? Thanks in advance JD

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RDR

#33181

PDBE and PBB replacements??? | 11 March, 2005

I'm stupid, what exactly are these for my future reference?

Russ

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#33182

PDBE and PBB replacements??? | 11 March, 2005

Russ: In December 2003, the European Commission released the following statement: �The commission services have prepared a draft Commission decision establishing maximum concentration values pursuant to Article5(1)(a) of Directive 2002/95/EC. The proposed values have been discussed at the Technical Adaptation Committee (TAC) meetings this year.�

The values they refer to are the 0.1% for lead, mercury, hexavalent chromium, PBB and PBDE and 0.01% for cadmium.

The most significant bromine sources of a printed circuit board are flame retardants and resins, both based on bromine, for example tetra-bromo-bisphenol A [TBBA].

At the present time, typical bromine contents of current FR4 base material types lie between 18 and 21% by weight of bromine. But also in some solder resists bromine-based components are formulated in order to meet the requirements of the non-flammability test according to UL 94 V-0.

Incineration of some brominated flame retardant produces toxins: * polybrominated biphenyl ether (PBBE) * polybrominated biphenyl oxide (PBBO)

Polybrominated diphenyl ether (PBDE) [Three most common commercial products are penta-BDE, octa-BDE and deca-BDE.] PBDEs have been used extensively over the past two decades as flame retardants in plastics, textiles, coatings and electrical components found in many common products including televisions, computers, and electrical appliances.

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#33183

PDBE and PBB replacements??? | 11 March, 2005

JD: It's important to note that FR-4 does not contain PBB or PBDE. The bromine in FR-4 epoxy comes in the form of tetra-bromo-bisphenol A [TBBA], which polymerizes and become part of the cross-linked epoxy. Bromine, in the form of hydrogen bromide, is generated when the material is exposed to flames or otherwise heated above its decomposition temperature, and this is what inhibits combustion of the laminate.

Some reports [refer to below] mention that PBB and PBDE may be in paper-phenolic (FR-1) laminates (used mainly in SE Asia to make circuit boards for inexpensive consumer products), and rubber-insulated cables are mentioned several times.

IVF carried out an international study on alternatives to halogenated flame retardants with 12 major European and Japanese electronics manufacturers and material suppliers. The report covers technical as well as environmental and economic aspects of a shift from brominated flame retardants. A public report of the project "Alternatives To Halogenated Flame Retardants In Electronic And Electrical Products - Results From A Conceptual Study" is available at: http://www.ivf.se/elektronik/Ep/Publications/pub1f.htm

Or a summary can be found at: http://www.mst.dk/udgiv/Publications/1999/87-7909-416-3/html/kap09_eng.htm

For more information on flame retardents, try: * http://www.bsef.com

* http://www.firesafety.org

For the summary of a study of flame retardants try: http://www.surrey.ac.uk/PRC/

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Jdumont

#33190

PDBE and PBB replacements??? | 12 March, 2005

Great answers! Basically im looking for where these materials exist to conform to RoHS. Ill check those links out.

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RDR

#33195

PDBE and PBB replacements??? | 14 March, 2005

Thanks Dave, greatly appreciated

Russ

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GS

#33313

PDBE and PBB replacements??? | 21 March, 2005

Hello Gents,

Many thanks Davef for your always helpful informations.

I have a question, pls, related to : which kind of Test Method are they going to be used to perform analysis (Rohs Compliance verification tests) on EEE in order to find out oncentration of BFRs like PBB, PBDE by using GCMS, FTIR, XRF equipment ?

Thank You GS I

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#33320

PDBE and PBB replacements??? | 21 March, 2005

RoHS Substance||RoHS MCV Limits||Typical Testing Approaches Lead||1000 ppm* ||Wet chemical digestion followed by ICP (Inductively coupled plasma) or AAS (atomic absorption) spectroscopy ||||XRF (X-ray fluorescence) spectroscopy Cadmium||100 ppm ||Wet chemical digestion followed by ICP or AAS ||||XRF Hexavalent Chromium||1000 ppm || Wet chemical digestion followed by UV-VIS (ultraviolet and visible absorption) spectroscopy ||||XRF (for elemental Cr only) Mercury||1000 ppm ||Wet chemical digestion followed by AAS ||||XRF PBB/PBDE||1000 ppm ||Solvent extraction followed by GC/MS (gas chromatography/mass spectroscopy) ||||XRF (for elemental Br only) *Note: A California Prop 65 ruling limits lead to 300 ppm in external cables to avoid product warning labels. [10 Steps Toward RoHS Directive Compliance, H Evans & J Johnson, Circuits Assembly, 2/05, p68-70]

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GS

#33328

PDBE and PBB replacements??? | 21 March, 2005

Many thanks Davef. Regards........... GS

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rush316

#33890

PDBE and PBB replacements??? | 25 April, 2005

You indicate that PBBs and PBDEs are included in FR4 materials!! Does this include PCB (Printed Circuit Boards)??

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#33892

PDBE and PBB replacements??? | 25 April, 2005

rush316

First, no one stated that PBB and/or PCBE are in FR4. FR4 contain tetra-bromo-bisphenol A [TBBA].

Second, there are classes [and grades] of dielectric materials used in fabricating printed circuit boards. Grades, NEMA LI-1. From these grades, laminators produce technical laminates: * Glass Fabric Grades: G3, G7, G10, G11, FR4, FR5 * Cotton Fabric Grades: L, C, CE, LE * Paper Grades: X, XP, XXP, XXXP(C)/FR2, FR3

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