RoHS

RoHS (Restriction of Hazardous Substances)

Officially known as Directive 2002/95/EC (RoHS 1) and subsequently updated via 2011/65/EU (RoHS 2) and (EU) 2015/863 (RoHS 3), RoHS is a European Union directive that restricts the use of specific hazardous materials in the manufacture of various types of Electronic and Electrical Equipment (EEE). Mechanism: The directive functions by enforcing strict maximum concentration values (MCVs) for banned substances at the "homogeneous material" level—meaning any individual substance that cannot be mechanically disjointed (such as a wire insulation casing, a resistor coating, or the solder on a joint). To legally place an EEE product on the EU market, manufacturers must maintain technical documentation and display a CE mark confirming compliance.

Restricted Substances and Concentration Limits As of RoHS 3, there are ten regulated hazardous substances. The compliance framework mandates that these substances cannot exceed a threshold of 0.1% by weight (1,000 PPM), with the strict exception of cadmium, which is capped at 0.01% by weight (100 PPM).

  • Lead (Pb): Historically used in tin-lead solders and component finishes; restricted due to its severe neurotoxicity.
  • Mercury (Hg): Used in switches, relays, and lamps; restricted due to bioaccumulation and central nervous system toxicity.
  • Cadmium (Cd): Used in electroplating, pigments, and NiCd batteries; restricted as a known carcinogen (capped at 100 PPM). -. Hexavalent Chromium (Cr6+): Used in anti-corrosion coatings and chrome plating; restricted due to its highly carcinogenic nature.
  • Polybrominated Biphenyls (PBB) & Polybrominated Diphenyl Ethers (PBDE): Flame retardants used in plastics; restricted due to environmental persistence and endocrine disruption.
  • Phthalates (DEHP, BBP, DBP, DIBP): Added under RoHS 3; plasticizers used to soften PVC and cable insulation, restricted due to reproductive toxicity.

    Regulatory Framework & Global Impact

Directive Phase

Key Structural Changes

Industry Operational Impact

RoHS 1 (2002) Established the original restriction on the first six hazardous substances. Forced a massive industry shift toward lead-free manufacturing, requiring higher-temperature tin-silver-copper (SAC) solders.

Established the original restriction on the first six hazardous substances.

Forced a massive industry shift toward lead-free manufacturing, requiring higher-temperature tin-silver-copper (SAC) solders.

RoHS 2 (2011)

Made RoHS a mandatory requirement for achieving CE Marking and expanded the product categories covered.

Imposed mandatory conformity assessment and record-keeping duties (EN 50581/EN IEC 63000 standards).

RoHS 3 (2015/ 2019)

Expanded the restricted list from six to ten substances by adding four specific phthalates.

Severely impacted the sourcing of flexible plastics, wires, and cable insulation materials across the supply chain.

Interaction with REACH

While both are EU environmental directives that frequently intersect in electronics manufacturing, they target distinct regulatory mechanisms: • RoHS: A specialized, product-specific directive focused exclusively on the materials inside Electrical and Electronic Equipment (EEE). • REACH: A broad, overarching chemical regulation governing the lifecycle of all chemical substances manufactured or imported into the EU across all industries.