You've definitely seen it before. On PCB spec sheets, component datasheets, or product packaging — the words "RoHS" or "RoHS compliant." You might not have paid much attention, thinking it's just another environmental label. But RoHS is one of the most important regulations in the electronics industry — without it, your product can't even enter the European market.

In this guide, I'll explain what RoHS means, what substances it restricts, who needs to comply, and how to become compliant. Plain English, no fluff.

1. What Exactly Is RoHS?

RoHS stands for Restriction of Hazardous Substances — a European Union regulation first adopted in 2003 to restrict the use of certain hazardous materials in electrical and electronic products.

In simple terms: RoHS is a "banned substances list" — it tells you which toxic materials you can't use in electronics.

RoHS has three core goals: protect the environment, protect workers, and protect consumers. When electronics are discarded, lead, mercury, and cadmium can leach into soil and groundwater — RoHS stops these substances at the source.

2. What Substances Does RoHS Restrict?

RoHS originally restricted 6 substances. It has since expanded to 10 substances:

Note: Cadmium's limit is 0.01% (100ppm) — 10 times stricter than other substances. The four phthalates were added later — China RoHS officially added them starting January 1, 2026.

These limits apply to "homogeneous materials" — every individual material in a product (copper foil, solder mask, plastic housing) must meet the limits on its own, not as an average across the whole board.

3. Who Needs to Comply with RoHS?

Any manufacturer, importer, or distributor selling electronic products in the EU market must ensure RoHS compliance.

If you sell electronics in the EU, you must be RoHS compliant.

RoHS covers almost everything with a plug or battery — home appliances, computers, mobile phones, telecom equipment, consumer electronics, lighting, power tools, toys, medical devices.

4. What Are RoHS Exemptions?

Some products can't yet use lead-free alternatives for technical reasons — certain high-temperature solders, medical devices (extreme reliability), aerospace (harsh environments).

RoHS allows these cases to temporarily use restricted substances — these are called exemptions.

But exemptions aren't permanent. The EU regularly reviews them. In 2025-2026, the EU is reassessing multiple lead exemptions — some are being extended, others are expiring. Many companies are redesigning products and switching to lead-free alternatives to prepare for expiring exemptions.

5. What Does RoHS Compliance Require?

For manufacturers, RoHS compliance isn't just "filling out a form" — it's a system-wide process.

1. Supply Chain Review

Check every supplier's components and materials — do plastics contain phthalates? Is the solder lead-free? Are coatings free of hexavalent chromium?

2. Material Testing

Test materials using XRF (X-ray fluorescence spectroscopy) and other methods. Send products to accredited labs for formal testing if needed.

3. Documentation

Prepare complete compliance documents — material declarations, test reports, declarations of conformity. These can be audited at any time.

4. Product Marking

Apply RoHS compliance marks, provide hazardous substance content tables, and display the environmentally-friendly use period (EFUP).

6. RoHS Is No Longer Just About Europe

RoHS started in the EU, but it has spread globally. China, Japan, South Korea, and the US all have similar regulations.

In 2026, China RoHS underwent a major expansion:

• Expanded from 12 product categories to 33

• Added 23 new categories — smartwatches, smart speakers, robot vacuums, servers, glucose monitors, and more

• New categories take effect August 1, 2027

• Expanded from 6 to 10 restricted substances (adding four phthalates)

Global manufacturers must now meet both EU RoHS and China RoHS requirements.

7. What Does RoHS Mean for PCB Manufacturing?

For custom PCB manufacturers, RoHS means:

• Materials must be compliant: PCB substrates, solder mask, surface finish, solder — every material must stay under the limits

• Suppliers must be controlled: All raw material suppliers must provide RoHS compliance certificates

• Processes must be controlled: Lead-free soldering requires tighter temperature control and more demanding processes than leaded soldering

A standard FR4 board using RoHS-compliant materials costs more, requires more complex processes, and needs more reliability verification. But it's the entry ticket to global markets.

8. Summary

RoHS compliance means ensuring that 10 hazardous substances in electronic products stay below legally defined limits.

It's not "nice to have" — it's a mandatory requirement for entering the EU market. Without RoHS compliance, your product won't clear customs. In 2026, China RoHS is also expanding significantly, and the compliance burden on global electronics manufacturers will only get stricter.

For manufacturers, RoHS compliance means: manage your supply chain, test your materials, prepare your documentation, and label your products correctly. It's a lot of work — but that's the cost of doing business in modern electronics manufacturing.