ROHS Compliance
ROHS COMPLIANT ECOLOGICALLY FRIENDLY RESISTORS
The directive 2011 / 65 / EU of European Parliament and of the Council dated 02 Jan 2013 prohibits and in some cases restricts the use of certain substances.
At HTR it has been determined by proof of declaration from our suppliers or by audit of the bill of materials that our ROHS compliant resistors comply with the relevant European ROHS directives as per our understanding and declare that our ROHS compliant declared resistors do not contain or contain less than:
- 0.01% (100 ppm) of Cadmium.
- 0.1% (1000 ppm) of hexavalent Chromium, polybrominated biphenyl (pbb), Polybrominated diphenyl ether (pbde), Mercury or Lead.
- 0.1% (1000 ppm) of Perfluoro-octane sulfonates.
- 0.1% (1000 ppm) of Decabromodiphenyl ether (deca-BDE), Pentabrominated diphenyl either (penta-BDE), Octabrominated diphenyl ether (octa-BDE).
At HTR the ” ∗ ” symbol is the sign for a ROHS compliant part. The absence of the ” ∗ ” symbol means it is a standard part and may not be ROHS compliant.
Our lead free resistor terminations have been extensively tested for good solderability with the existing tin/lead solders available in the market.
However, for the full compliance with the notification it will be necessary for the manufacturer of electrical / electronic products our customers to not only use lead free components but also to use lead free solders with their relevant fluxes.
These lead free solders will be alloys of tin / silver / copper OR tin / silver / bismuth.
At HTR our ROHS Compliant resistors are also tested for solderability using a lead free alloy having composition Tin – 96.4%, Silver – 3.2% & Copper – 0.4%.
As per recent studies it appears that the Tin / Silver / Copper alloy gives the best results in terms of reliability but this solder requires a higher temperature to be used which is approximately 270°C as against 235°C for Tin / Lead solder and therefore the manufacturer of electrical / electronic products will have to reset his soldering process taking this into account which may involve change of soldering equipment / parts and solder profile.
