Understanding EN14594, EN397 and EN16321: blasting respirator standards explained

When you look at the specifications for a blasting helmet, you will see a series of standards references: EN14594, EN397, EN166, EN16321, sometimes EN12941. If you are responsible for selecting PPE, understanding what these standards actually mean, and what they guarantee, is essential to making the right purchase decision.

This article explains each standard, what it tests, and how to read a product's certification to evaluate whether it is fit for your application.

Standards are not marketing labels. They are independently tested certification requirements that define minimum performance thresholds. A product certified to EN14594 has been tested by an accredited body and proven to meet specific airflow, protection factor, and construction requirements. A product that claims compliance without third-party certification offers no such guarantee.

For HSE managers and safety buyers, purchasing certified equipment is also a legal protection: it demonstrates due diligence in selecting equipment appropriate to the identified risk.

This is the primary respiratory standard for blasting helmets that use a supplied air system (SAR: Supplied Air Respirator). It defines performance requirements for helmets and hoods that receive clean, breathable air via an airline connected to a compressor or clean air source.

• Minimum airflow delivered to the wearer (volume per minute)
• Inward leakage: how much contaminated ambient air can enter the breathing zone

   

• Carbon dioxide build-up inside the helmet

   

• Breathing resistance and comfort parameters

   

• Mechanical integrity and construction requirements

EN14594 products are classified by protection class:

• Class 3: Minimum airflow 120 L/min, suitable for lower-hazard environments
• Class 4B: Minimum airflow 170 L/min: the class required for abrasive blasting in most industrial applications. This is the class to look for on blasting helmets.

The Nova 3® Blasting Helmet is certified to EN14594 4B: the appropriate class for industrial airblasting operations.

Where EN14594 covers supplied-air (SAR) systems, EN12941 covers powered air-purifying respirators (PAPR): systems that filter ambient air through a motor-driven unit rather than drawing from a clean external source.

• TH1: Minimum protection factor 4, lowest class
• TH2: Minimum protection factor 12
• TH3: Minimum protection factor 500: the highest class, required for high-hazard environments

For blasting applications with significant dust generation, TH3 classification is recommended. The T-Link PAPR (EN12941 TH3) and Z-Link® (EN12941 TH3) meet this requirement.

This standard covers impact and penetration resistance for industrial hard hats. In the context of blasting, EN397 certification confirms that the outer shell of the blasting helmet provides protection against falling objects and accidental impacts, which is relevant in industrial environments where overhead hazards exist.

• Impact absorption: drop test with a defined force
• Penetration resistance
• Retention system strength (chin strap)
• Lateral deformation

Optional clauses cover additional hazards such as electrical insulation, molten metal splash resistance, and extreme temperature performance.
Blasting helmets certified to EN14594 AND EN397 provide both respiratory protection and head impact protection in a single unit, which is the appropriate specification for industrial blasting environments.

EN166 has long been the European standard for personal eye protection. In blasting helmets, it applies to the visor: the transparent panel through which the operator sees. The standard defines optical quality, mechanical strength, and resistance to various hazards.

However, EN166 is being progressively replaced by EN ISO 16321, which introduces updated testing methods, broader hazard coverage, and improved performance classifications for modern industrial applications, including blasting.

Eyewear manufactured according to the standards can still be used and will be replaced with glasses of a newer standard after their service life has expired.

• Class 1: Highest optical quality, recommended for extended use to prevent visual fatigue
• Class 2 and 3: Lower optical quality, suitable for shorter periods

• B: Medium energy impact resistance
• F: Low energy impact (insufficient for blasting)

Additional codes cover UV filtration, infrared filtration, and fogging resistance.

The new standard reorganizes and expands these requirements:

• Maintains high optical quality requirements for continuous wear (equivalent to Class 1)
• Introduces more detailed impact resistance categories and testing conditions
• Enhances requirements for durability, coating performance (e.g., anti-scratch, anti-fog), and environmental resistance
• Covers a wider range of hazards and aligns more closely with global ISO standards

For blasting applications, the equivalent of EN166 Class 1B remains the minimum benchmark: high optical quality combined with medium energy impact resistance. Under EN16321, users should ensure visors are certified for high optical performance and appropriate impact resistance for abrasive blasting environments.

The Nova 3® and Z-Link® visors, previously certified to EN166 Class 1B, are expected to transition to compliance with EN16321, maintaining equivalent or improved protection performance under the new standard.

A helmet specification might read: EN14594:2005 4B | EN12941:1998+A2:2008 TH3 P R SL | EN397:2012+A1:2012 | EN166:2001 Class 1B

This means:

• EN14594 4B: highest-class supplied-air respiratory protection for blasting
• EN12941 TH3 P R SL: TH3 PAPR protection, P=particle filter, R=reusable, SL=particle filter class
• EN397: hard hat impact protection
• EN166 Class 1B: optical quality 1, medium energy impact resistance

This combination, as found on the Nova 3®, represents a fully compliant specification for industrial airblasting.

• EN14594 Class 4B is the respiratory standard to look for in abrasive blasting helmets.
• EN12941 TH3 is the equivalent for PAPR systems used in high-dust blasting environments.
• EN397 ensures the helmet shell provides head impact protection; look for both EN14594 and EN397 on the same product.
• EN166 Class 1B is the minimum visor standard for extended blasting operations.
• Always verify certification against independent test reports, not just product labelling.