Table of Contents
What is SOC?
SOC means “Substance of Concern” or “Substances of very high Concern reach” or “Substance of high Concern”
SOC Substances pose a potential risk to human health and the environment.
Substance of High Concern | Effect on the Environment
- Soil Contamination
- Water Contamination
- Acid Rain
- Expanding Desert
Substance of High Concern | Effect on the Human Body
- Asbestos – Lungs Cancer
- Lead (Pb) – Brain & Bone
- Cr(VI) – Lungs, Kidney, Liver
- Mercury (Hg) – Nervous, Digestive & Immune System
- PBB & PBDE – Stomach & Joints
Substance of Very High Concern List
The substances of very high concern reach list with applications and their adverse effects:
| Substance | Adverse effect | Few Application Area |
| Lead (Pb) | Nervous system | Battery / Paint / Rubber Compound / Solders / Terminals |
| Cadmium (Cd) | Respiratory system | Thick Film Paste for PCB / Glass / Mirror / EV Batteries active material |
| Mercury (Hg) | Nervous system, digestive system and Immune system | Switches / HID Lamps / Display screen Speedometer |
| Hexavalent Chromium (Cr6+) | Skin Problem | Chrome Passivation |
| Asbestos | Lungs Cancer | Brake Pads / Clutch Disc / Gaskets / PP Containing Talc / Epoxy resin/Adhesives |
| Liver, Stomach, Joints | Lever, Stomach, Joints | Plasticizers for PVC / Rubber/Adhesives/Ink/Epoxy |
| POPs, (e.g. PFOA, PFHXs, DP) Persistent Organic Pollutants | Cancers, birth defects, reproductive systems, and damages to nervous systems. | Lubricants & Flame Retardants for Fabric / Mat /Teflon |
Substance of High Concern | Common SOCs List
| Substance / group | Typical uses | Why it’s a concern | Typical limits / notes |
|---|
| Lead (Pb) | Solders, finishes, alloys, batteries | Toxic; bioaccumulative; developmental neurotoxin | Regulated by RoHS, ELV; many parts must be < threshold mg/kg |
| Cadmium (Cd) | Plating, stabilizers, pigments | Carcinogen, toxic to kidneys | Restricted in RoHS/REACH |
| Hexavalent chromium (Cr(VI)) | Corrosion protection, plating | Carcinogenic, skin sensitizer | Restricted; replace with trivalent chromium where possible |
| Mercury (Hg) | Switches, lamps, sensors | Neurotoxin; persistent | Strictly controlled; many bans |
| Brominated flame retardants (BFRs, e.g., PBDEs) | Plastics, PCBBs | Persistent, bioaccumulative, endocrine disruption | Many restricted under RoHS/REACH |
| Phthalates (DEHP, DBP, BBP, etc.) | Plasticizers in PVC | Reproductive toxicity, endocrine disruption | Listed in RoHS/REACH; specific bans in toys/child products |
| Per- and polyfluoroalkyl substances (PFAS) | Coatings, sealants | Persistent, mobile, toxic | Increasing regulatory scrutiny worldwide |
| SVHCs (REACH: Substances of Very High Concern) | Various | Carcinogenic / mutagenic / reproductive / PBT/vPvB | Requires notification, authorization |
| Nickel (release) | Stainless/finish parts, jewelry | Allergen; in some cases regulatory limits on release | Nickel release testing required in some product categories |
| Asbestos | (Historically) insulation, gaskets | Carcinogenic | Banned or strictly prohibited |
| Formaldehyde | Resins, adhesives | Carcinogen; irritant | Limits in indoor air/products |
| Polychlorinated biphenyls (PCBs) | Transformers, capacitors (legacy) | Toxic, persistent | Prohibited; legacy remediation |
Evolution of SOC Regulations
SOC Regulations History at the World Level:
YEAR 2000 | End-of-Life Vehicle Directive
Pb, Cd, Hg, Cr6+ Restriction of Heavy Metals
YEAR 2006 | RoHS -Restriction of Hazardous Substance
Directive Heavy Metals + PBB + PBDE 4 Phthalates (ROHS3)
YEAR 2007 | REACH
REACH – Registration, Evaluation, Authorization, and Restriction of Chemicals
YEAR 2012 | Asbestos Prohibition
Asbestos 6 Substances banned
YEAR 2018 | POPs & Phthalates Restriction
Restriction on POPs Substances and 4 Phthalates
SOC Control Contents
“SOC control” contents to be exempt from restriction.
REACH Stands for – Registration Evaluation Authorization and Restriction of Chemicals
SVHC Stands for – Substances of Very High Concern
ELV Stands for – End of Life Vehicles
RoHS Stands for – Restriction of Hazardous Substance
IMDS Stands for – International Material Data System. It helps in achieving Substance Level Analysis. Substance of Concern (SOC) Compliance.
General mitigation strategy for SOCs
- Identify & map : Use IMDS or a similar tool to build a bill-of-materials (BOM) or component-level map showing potential SOC locations.
- Screen & prioritize : Prioritize materials based on risk (toxicity, concentration, exposure pathways, and product criticality) and check them against regulatory lists (REACH, RoHS, and local regulations).
- Control at source : Whenever feasible, get rid of or replace dangerous materials.
- Supplier management : demand contractual restrictions, analytical testing, audits, and declarations
- Verification & testing : carry out routine laboratory tests and incoming inspection.
- Process controls : waste management, segregation, PPE, emission controls, and containment.
- Documentation & traceability : maintain version control, change notification, and traceability (IMDS entries, test reports).
- Monitoring & update : continual improvement, recurring re-audits, and regulatory monitoring.
- End-of-life & circularity : design for recovery initiatives, safe disposal routes, and recycling.
