The Restriction of Hazardous Substances (RoHS) directive, a European project meant to decrease the environmental impact on electronic or electrical products in the waste stream and enhance the recyclability of waste. Its initiative is to create electronic and electrical products that are sold in Europe to free from hazardous substances as of July 1, 2006. This means all firms that manufacture, import or rebrand electronic equipment destined for Europe must ensure their products adhere to RoHS guidelines.
Some manufacturers may find complying with PCB Screw Terminal Block costly and complex, nevertheless it could eventually help them inside the long run since there certain US states are passing their own ROHS regulations including SB20 and SB40 in California.
The Waste and Electrical Electronic Equipment (WEEE) directive, the catalyst behind RoHS, requires people who produce electronic equipment to take on the responsibility of recycling or recovering their products.
Breakdown of the RoHS Directive as well as its Requirements: Sometimes confused with the movement for “lead-free” electronic production, the RoHS command concentrates on six substances. Lead, a vital issue, and five other substances covered by the directive. The others include Hexavalent Chromium, Cadmium, Mercury, PBBs and PBDEs.
Banned/Restricted Substance Use/Where Found in Electronics
• Yellow pigments, phosphorescent coatings, paints, cadmium batteries, plastic additives, especially PVC and LEDs/detectors/devices.
• Lamps, lighting/bulbs (scanners, displays, projectors), pigments, Mercury Switches, paints and polyurethane materials (high gloss windows)
• Alloys, Hexavalent Chromium Metal finishes for deterioration protection- Chasses fastener- aluminum conversion coatings
• Flame retardants like cables, housings, plastics, connectors and paints, (PBBs) Polybrominated Byphenyls
• (PBDE) Polybrominated Diphenyl Ethers
• PVC cables- UV/heat stabilizers, chasses, washers, metal parts- Lead solder and interconnect paints, pigments, batteries, discrete components, sealing glasses, CRT glass, and piezoelectric devices
Who Must Comply and What Products Will It Cover? Barrier Terminal Block regulations include a wide class of products, including toys, sports, leisure, medical equipment, monitoring and control instruments, electrical/electronic instruments and IT/Telecom and consumer equipment.
Producers may have to make changes to product design stipulations and command different production processes for the subassemblies and components they utilize inside their products. The responsibility to comply lies with the producers, so that they must direct the actions of PCB fabrication, materials, assembly, component and other supplies to make certain everything contributes properly to terminate-product compliance.
Product Exceptions. Production exceptions include industrial tools, medical equipment and replacement parts. Producers can supply “original equipment” or non-conforming replacement parts to correct a product or service sold into the market before the RoHS took effect. However, they cannot use non-conforming replacement parts to repair conforming parts.
Typical Producer Compliance Sequence. Producers must revisit all existing product designs and specifications and go ahead and take necessary steps to create the products into compliance. Meanwhile, you may prepare specifications for brand new products at the beginning of the product development stage to ensure they conform to RoHS. This procedure may take weeks or months of work.
The Impact on PCB’s. Even though lead stands amongst the six substances restricted, this is a main concern in Printed Circuit Board assembly. To adhere to RoHS, PCBs have to make the transition to lead-free solders materials. Many other materials found in PCBs will need replacement to comply with RoHS.
For many years the electronic industries have tried tin/lead solder to sign up with the constituents towards the printed circuit boards. The board fabricators have also used tin/lead solders as a surface finish to protect the copper from corrosion. The 63/37 tin lead ratio of solder fit well in the assembly thermal parameters and the physical limitations of the base materials. RoHS requirements have changed the principles! With the new directive, tin lead solders are not allowed and for that reason major changes are needed within the printed circuit board fabrication and assembly arenas to adapt to this particular. Companies have addressed these concerns in a manner which is beneficial to both the assembler and also the consumer in the printed circuit boards we manufacture. Our lead free boards are made with laminate which have a higher Td (decomposition temperature) to stand up to the improved temperature and dwell times required during assembly. The plating finishes that we can offer eqrfdn also Module Box compatible. Currently the most often used lead free material is Isola IS410 and the lead-free finishes like immersion gold, immersion silver, immersion white tin or Lead free HASL (using SN100CL lead free solder from Florida CirTech).