European Standard · Respiratory Protection
EN 136 – Full Face Masks: Requirements for High-Level Respiratory and Eye Protection
EN 136 is the European standard specifying requirements for full face masks that protect both the respiratory system and the eyes and face, used with replaceable filters or connected to breathing apparatus in demanding industrial and emergency response environments.
1. Scope
EN 136 covers full face masks divided into three classes: Class 1 for light duty use, Class 2 for general use, and Class 3 for high duty use such as firefighting and hazardous chemical environments. It specifies requirements for the visor, harness, valves, and filter or breathing apparatus connections.
2. Exclusions & Related Standards
- Does not cover half or quarter masks – see EN 140.
- Does not cover disposable filtering half masks – see EN 149.
- Replaces the need for separate eye protection since the full face visor already meets impact and optical requirements similar in intent to EN 166.
- Filters attached must separately meet EN 143 or appropriate gas filter standards.
3. Key Requirements & Marking
Full face masks must meet requirements for visor optical quality and impact resistance, inward leakage limits, exhalation valve performance, harness adjustability, and compatibility with standardised filter or breathing apparatus connectors. Class 3 masks undergo the most rigorous flame and heat resistance testing.
4. Testing Overview
Testing includes total inward leakage testing on human subjects, visor field of vision and optical distortion checks, flame engulfment resistance for Class 3 masks, valve and harness durability, and practical performance during simulated work tasks.
5. Selection Guide
Class 1 masks suit light industrial dust protection, Class 2 masks are appropriate for general industrial chemical and particulate hazards, and Class 3 masks are required for firefighting, hazardous material response, and situations involving flame or radiant heat exposure alongside respiratory hazards.
6. Inspection, Care and Maintenance
- Inspect the visor for scratches, cracks or UV degradation that could impair vision or seal integrity
- Clean and disinfect after each use, particularly for masks shared between multiple wearers
- Check exhalation valves for debris, cracking or improper seating
- Replace filters or check breathing apparatus air supply according to manufacturer schedules
- Store in a rigid protective case away from heat, sunlight and solvents
7. Frequently Asked Questions
What is the difference between Class 1, 2 and 3 full face masks?
Class 1 is for light duty use, Class 2 for general industrial use, and Class 3 for high duty applications such as firefighting where flame and heat resistance are essential.
Do EN 136 masks protect the eyes as well as the lungs?
Yes, the full face visor provides impact and optical protection to the eyes and face in addition to the respiratory seal provided by the mask.
Can EN 136 masks be used with supplied air systems?
Yes, many full face masks are designed to connect to supplied-air or self-contained breathing apparatus in addition to filter connections.
Are EN 136 masks suitable for firefighting?
Only Class 3 masks meeting the additional flame engulfment and heat resistance tests are suitable for firefighting and similar high-heat emergency response work.
How often should the visor be replaced?
The visor should be replaced whenever scratches, haze or cracks impair visibility, or according to the manufacturer’s recommended service life, typically every few years with normal use.