(EU) 2016/425 vs ISO 12312-2: The Real Standard for Eclipse Glasses in Europe

Introduction

Solar eclipses bring millions of people outside, eager to witness one of nature’s rarest spectacles. The total solar eclipse on 12 August 2026 will cross Spain and parts of Europe, and demand for solar eclipse glasses is already rising. But confusion remains: should you trust products that claim ISO 12312-2 certification, or should you look for the EU regulation reference (EU) 2016/425?

In this guide, we’ll break down both terms, explain how they connect, and show you what really matters when buying or selling eclipse glasses in Europe.

Why Eclipse Glasses Are Regulated in Europe

Eclipse glasses aren’t toys or novelty items. They’re personal protective equipment (PPE) designed to protect your eyes against intense solar radiation. In the EU, that places them under Regulation (EU) 2016/425 on Personal Protective Equipment.

Category II PPE under (EU) 2016/425

The regulation divides PPE into three categories:

• Category I – minimal risks (e.g., gardening gloves)

• Category II – medium risks that are not minimal or irreversible, but serious if protection fails

• Category III – very serious or life-threatening risks (e.g., asbestos suits, fall arrest harnesses)

Solar eclipse glasses fall into Category II, because looking at the sun without proper filters can cause permanent eye damage but doesn’t immediately threaten life.

That means:

• They require an EU type-examination by a notified body.

• They must carry the CE mark.

• A Declaration of Conformity must be issued by the manufacturer.

ISO 12312-2 Explained

Now let’s talk about the other big term: ISO 12312-2:2015.

This is an international testing standard titled: “Eye and face protection — Sunglasses and related eyewear — Part 2: Filters for direct observation of the sun.”

It defines strict requirements for solar viewers:

• Transmittance limits for visible light, UV, and IR radiation

• Uniformity of the filter across the viewing area

• Mechanical integrity (no cracks, pinholes, or bubbles)

• Mounting of the filter into the frame

• Labelling requirements for safe use

Manufacturers test their products against ISO 12312-2, usually through accredited labs. Passing these tests is the technical proof that glasses are safe.

CE Marking Under (EU) 2016/425

Here’s the key connection: in Europe, compliance with ISO 12312-2 is how manufacturers prove that their eclipse glasses meet the safety requirements of (EU) 2016/425.

But consumers will rarely see “ISO 12312-2” written on packaging. What they will see is the CE mark.

What must appear on the product and packaging

When eclipse glasses are legally compliant in the EU, they must have:

• CE marking visibly printed on the product or packaging

• A reference to (EU) 2016/425

• Manufacturer’s or importer’s name and address

• A lot or batch number for traceability

• Instructions for safe use in all required EU languages (e.g., warnings not to use with telescopes or binoculars, discard if scratched or damaged, maximum safe viewing time, expiry date if applicable)

• A Declaration of Conformity (often available via QR code or website link)

Without these elements, the glasses are not legally marketable in the EU.

ISO vs (EU) 2016/425: Key Differences

👉 ISO is the science. EU 2016/425 is the law.

A manufacturer can say “ISO-tested,” but if it doesn’t carry CE marking under (EU) 2016/425, it’s not legally compliant for sale in Europe.

Red Flags for Unsafe Eclipse Glasses

With demand peaking before the 2026 eclipse, many unsafe or fake glasses will appear online. Watch out for:

• Packaging that says “ISO certified” but has no CE marking

• No manufacturer/importer address listed

• Missing lot or batch number

• Instructions only in English (instead of multi-language)

• No Declaration of Conformity available

• Suspiciously low prices from unknown sellers

If you see any of these signs, don’t risk your eyesight.

Final Checklist Before You Buy

When buying eclipse glasses in Europe, ask these questions:

1. Do they have a visible CE mark?

2. Do they mention (EU) 2016/425?

3. Is the manufacturer/importer name and address printed?

4. Can you see a lot/batch number for traceability?

5. Are instructions provided in multiple EU languages?

6. Is there a Declaration of Conformity (QR code or link)?

7. Do they look professionally made (no pinholes, scratches, flimsy material)?

If the answer is “yes” to all, you’ve likely found a safe pair.

Conclusion: The Real Standard in Europe

For the 2026 eclipse, don’t be fooled by buzzwords. ISO 12312-2 is important, but in Europe the real standard is compliance with (EU) 2016/425. That’s what makes eclipse glasses legal, traceable, and safe.

So when you’re preparing for the big event, remember: look for CE marking under (EU) 2016/425 — not just an ISO claim.

Your eyes are worth it.