The forms and replacement of RoHS-restricted six harmful ingredients.

1.Lead: Lead is mainly found in lead-containing solders, CRT glass, light bulbs, pigments, solid lubricants, rubber, lead-acid batteries, and PVC heat stabilizers. The solder of the circuit board is a eutectic solder consisting of 63% tin and 37% lead. The melting point of this solder is 183°C. Currently, lead-free soldering techniques and processes can be used to replace conventional soldering processes. Lead-free solder materials are also different due to different soldering equipment. Manual soldering generally uses Sn-Cu, Sn-Ag or Sn-Ag-Cu, dip soldering and wave soldering using Sn-Cu, and reflow soldering using Sn-Ag and Sn-Ag-Cu.

2.Cadmium: Cadmium is mainly found in switches, springs, connectors, housings, PCBs, fuses, paints and coatings, and semiconductor photoelectric sensors. The substitution of cadmium in the field of low-voltage electrical appliances may use silver tin oxide indium oxide (AgSnO2In2O3) instead of silver cadmium oxide (AgCdO).

3.Hg: Hg is mainly found in thermostats, sensors, relays, metal etchants, batteries, preservatives, disinfectants, adhesives, etc. Rechargeable batteries such as nickel hydride and lithium ion batteries can be used instead of mercury-containing batteries, and newer thermostats and sensors that do not contain mercury can be used.

4.Chromium (hexavalent): Chromium (hexavalent) mainly exists in metal anti-corrosion coatings, pigments, rust inhibitors, corrosion inhibitors, ceramic glazes,etc. Alkaline galvanization can be used instead of chrome plating, Cr3+ can be used instead of Cr6+ to reduce the harm to the environment, or no plating can be used.

5.Polybrominated biphenyls and Polybrominated diphenyl ethers: mainly found in flame retardants, PCBs, connectors, and plastic housings. Phosphorus-based flame retardants may be used instead of brominated flame retardants, or inorganic flame retardants such as magnesium hydroxide, aluminum hydroxide, and the like may be used.  

Kingford here strictly complies with the IPC standard, providing our customer products meet ROSH standards. Welcome contact us! [email protected]

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