RoHS Guide in Electronics: RoHS, WEEE and Lead-Free FAQhttp://www.flason-smt.com/new/RoHS-Guide-in-Electronics-RoHS-WEEE-and-Lead-Free-FAQ.html
If you are in Electronics Industry, Electronics Assembly and Manufacturing or Electronics Rework / repairing then you must have heard of RoHS, WEEE and Lead-Free.
- What is RoHS (Restriction of Hazardous Substances)?
- What is WEEE (Waste from Electrical and Electronic Equipment)?
- What is Lead-Free?
Let us discuss these in detail:
What is RoHS?
RoHS stands for Restriction of Hazardous Substances. RoHS, also known as Directive 2002/95/EC, originated in the European Union and restricts the use of specific hazardous materials found in electrical and electronic products. All applicable products in the EU market after July 1, 2006 must pass RoHS compliance.
What are the Restricted Materials Mandated Under RoHS?
The substances banned under RoHS are lead (Pb), mercury (Hg), cadmium (Cd), hexavalent chromium (CrVI), polybrominated biphenyls (PBB) and polybrominated diphenyl ethers (PBDE).
Why is RoHS compliance important?
The restricted materials are hazardous to the environment and pollute landfills, and are dangerous in terms of occupational exposure during manufacturing and recycling.
How are products tested for RoHS compliance?
Portable RoHS analyzers, also known as X-ray fluorescence or XRF metal analyzers are used for screening and verification of RoHS compliance. Other Products are also available to check presence of Hazardous Substances.
Which companies are affected by the RoHS Directive?
Any business that sells applicable electronic products, sub-assemblies or components directly to EU countries, or sells to resellers, distributors or integrators that in turn sell products to EU countries, is impacted if they utilize any of the restricted materials.
What is WEEE?
WEEE stands for Waste from Electrical and Electronic Equipment. WEEE, also known as Directive 2002/96/EC, mandates the treatment, recovery and recycling of electric and electronic equipment. All applicable products in the EU market after August 13, 2006 must pass WEEE compliance and carry the “Wheelie Bin” sticker.
How are RoHS and WEEE related?
WEEE compliance aims to encourage the design of electronic products with environmentally-safe recycling and recovery in mind. RoHS compliance dovetails into WEEE by reducing the amount of hazardous chemicals used in electronic manufacture.
What is Lead-Free?
Solder Wire with NO LEAD (Pb) is called Lead-Free or Lead-Free Solder.
Lead-Free Soldering – Why?
WEEE Recycle Chart
The simplest explanation for the tremendous interest in lead-free soldering is FEAR: Fear of Legislation, Fear of Trade Barriers, and Fear of Competition. Most companies do not necessarily want to change to lead-free, but rather are motivated by a combination of these three fears.
The WEEE / RoHS directives in Europe and similar mandates in Japan have instilled fear that a legislative body will prohibit the use of lead in electronics soldering.
If a particular country disallows lead in electronics, a trade barrier is created between that country and anyone not capable of providing lead-free electronics solutions. Of course, this also could take place between individual companies.
Some companies already are producing electronics products with lead-free solder alloys and marketing them as such. This has led to fears of being caught behind commercially.
Frequently Asked Questions (FAQ) On Lead-Free Soldering
Why is there a push for lead-free solders in electronics soldering applications?
The health and liability risks associated with the use of lead have led to government regulations concerning the elimination of lead from certain manufacturing processes. Lead already has been banned from paint, plumbing, and gasoline. Solder is likely to be regulated in the near future as well.
Why should some lead-free alloys be approached cautiously?
The compositions and traits of lead-free solder alloys vary greatly. However, some alloys should be approached cautiously:
- Tin migration during high temperature thermocycling is often associated with tin-silver alloys.
- Alloys with a high percentage of exotic or expensive metals may be cost prohibitive.
- Very high melting temperatures, which may damage parts, exist with some tin-silver and tin copper alloys.
- The inevitable damage or destruction of parts during repair, such as with conductive adhesives, is something to be wary of.
Are lead-free alloys as durable as tin-lead alloys?
Many of the available lead-free alloys offer significant durability advantages over tin-lead alloys. Benefits such as higher joint strength, better fatigue resistance, improved high temperature life, and harder solder joints are common to some of these alloys. However, these benefits vary greatly among the various lead-free alloys, and research is required in order to choose the correct alloy.
How do lead-free alloys compare to tin-lead alloys for application temperature requirements?
Typically, lead-free alloys have higher melting points than tin-lead alloys. These range from 215°C to 240°C. It is very important to consider the melting point while choosing a lead-free alloy, as many components and materials cannot withstand the very high reflow peak temperatures (upwards of 260°C) of some tin-silver and tin-copper alloys.
Are lead-free alloys compatible with all flux types?
In general, lead-free alloys may be used with most flux chemistry. Again, however, these alloys vary greatly, and compatibility with solder paste, cored wire solder, and liquid flux chemistry is dependent upon the melting point and composition of the alloy.
In what solder forms can lead-free alloys be produced?
Most lead-free alloys are available in all solder forms, including solder paste, cored wire solder, solid wire, bar solder, spheres and preforms. Exceptions to this are alloys that contain a high amount of indium or bismuth, which cannot be produced as cored wire solder due to manufacturing issues.
What are the attributes that one should look for while searching for a lead-free solder alloy?
Lead-free solder alloys should possess the following characteristics:
- No current or future negative environmental impact
- Low cost
- Easily repaired
- Compatibility with existing parts and processes
- No toxic or exotic constituents
Are lead-free alloys compatible with no clean flux chemistry?
Many users of fluxes and solder pastes have (justifiably) wondered if they will have to switch chemistry when they switch to a lead-free process. The answer is: It depends. If you switch to a high melting point alloy such as tin-silver or tin-copper, then it is likely that a change will have to be made. However, with lower melting point lead-free alloys (If there exists any) it is much more likely that you can continue to use the same flux chemistry without resulting in charred residues, dewetting, cleaning difficulties, etc. Of course, this is most dependent upon the thermal stability of the flux chemistry being used.
Lead-Free Alloy Element Tolerances
Solder alloys have an acceptable tolerance for each component element in the alloy. Per IPC-J-STD-006, elements that constitute up to 5% of an alloy may vary by up to ±0.2%, while elements that constitute greater than 5% of an alloy may vary by up to ±0.5%.
For example, the Sn63/Pb37 alloy may contain between 62.5% to 63.5% tin and 36.5% to 37.5% lead. The Sn62/Pb36/Ag2 alloy may contain between 61.5% to 62.5% tin, 35.5% to 36.5% lead and 1.8% to 2.2% silver.
Below is a chart of various lead-free alloy compositions and their potential elemental range.
Lead-Free Alloy Element Tolerances
Flason Electronic Co.,ltd provide a full smt assembly line solutions, including Lead free reflow oven, wave soldering machine, SMT pick and place machine, smt stencil printer, PCB conveyor manufacturer, PCB unloader, chip mounter, SMT AOI machine, SMT SPI machine, SMT X-Ray machine, SMT assembly line equipment, PCB production Equipment smt spare parts etc any kind SMT machines you may need, please contact us for more information: wechat whatsapp:008613691605420, Skype: flasonsmt, Email: firstname.lastname@example.org
1) This is the first time I use this kind of machine, is it easy to operate?
There is English manual or guide video that show you how to use machine.
If you still have any question, please contact us by e-mail / skype/ phone /trademanager online service.
2) If machine have any problem after I receive it, how can I do ?
Free parts send to you in machine warranty period.
If the part is less than 0.5KG, we pay the postage.
If it exceeds 0.5KG, you need to pay the postage.
3) MOQ ?
1 set machine, mixed order is also welcomed.
4) How can I buy this machine from you? ( Very easy and flexible !)
A. Consult us about this product on line or by e-mail.
B. Negotiate and confirm the final price , shipping , payment methods and other terms.
C. Send you the proforma invoice and confirm your order.
D. Make the payment according to the method put on proforma invoice.
E. We prepare for your order in terms of the proforma invoice after confirming your full payment.
And 100% quality check before shipping.
F.Send your order by air or by sea.
5)Why choose us ?
A. Gold supplier on Alibaba !
B. Trade assurance to US$54,000 !
C. Best price & Best shipping & Best service !
PREVIOUS：Basic Soldering Guide – How to Solder Electronic ComponentsNEXT：Electronic Components, Parts and Their Function
- Reflow oven provider-Flason
- Lead-free processes propose new requirem
- Nitrogen Protection Reflow Oven
- Mixed process of SMT reflow oven
- Solder Joint Reliability
- Company News
- Industry news
- How to Maintain a Reflow Oven?
- How to optimize the reflow profile?
- How the modern solder reflow oven works?
- SMT Defect List
- How to Prevent Solder Ball and Bridging Defects during the S
Add: Flason Industry park Shajing Town Baoan district shenzhen China 518104
When SMT matter to your business, partner with Flason. Where innovation takes form.
reflow oven lead free reflow oven LED strip reflow oven dual rail reflow oven custom reflow oven China reflow ovenSMT Peripheral Equipment SMT reflow oven
wave soldering machine pick and place machine lead free wave soldering machine custom wave soldering machinecustom pick and place machine SMT Assembly line
SMT Reflow Oven Manufacturer Wave Soldering Mahchine Manufacturer Pick and Place Machine ManufacturerReflow Oven Manufacturer SMT Spare Parts LED Pick and Place Machine
Andrey: email@example.com Wechat whatsapp:+86 13691605420
Keywords: Reflow Oven Manufacturer SMT Reflow Oven Manufacturer Wave Soldering Machine Manufacturer SMT Stencil Printer Manufacturer Pick and Place Machine Manufacturer SMT Inspection machine Manufacturer SMT Pick and Place machine Manufacturer SMT Peripheral Equipment Manufacturer SMT Spare Parts Manufacturer SMT Reflow oven SMT AOI Machine Manufacturer Chip Mounter Manufacturer Solder Paste Printers Manufacturer SMT Reflow Oven Manufacturer SMT Feeder Storage Cart Manufacturer Selective soldering machine Manufacturer SMT Nozzle Manufacturer Siemens Feeder SMT Feeder Manufacturer Wave Soldering Machine Manufacturer Lead Free Reflow Oven Manufacturer Selective Wave soldering machine LED strip Reflow Oven Manufacturer Wave Soldering Machine Manufacturer Automatic SMT Stencil Printer Juki RS-1 Pick and Place Machine SMT Peripheral Equipment Manufacturer China wave soldering machine manufacturer Small wave soldeirng machine
For More information,visit US: Reflow Oven Manufacturer or SMT Reflow Oven Manufacturer Wave Soldering Machine Manufacturer SMT Stencil Printer Manufacturer Pick and Place Machine Manufacturer SMT Inspection machine Manufacturer SMT Assembly Line Manufacturer SMT Peripheral Equipment Manufacturer SMT Spare Parts Manufacturer SMT Feeder Manufacturer SMT Nozzle Manufacturer SMT X Ray Machine Feeder storage cart Manufacturer SMT Reflow Oven Manufacturer manufacturer email us: firstname.lastname@example.org