Standard Test Method for Determining the Arc Rating and Standard Specification for Arc Rated Eye or Face Protective Products
ASTM F2178 establishes the requirements and test methods used to evaluate arc-rated face protective products, including arc flash face shields, hoods, balaclavas, and integrated helmet systems. The standard ensures that face protection used in electrical work provides a known level of protection against arc flash hazards and meets minimum performance requirements.
Key aspects of this standard include:
Arc Rating Determination
ASTM F2178 uses controlled electric arc exposures to determine the Arc Thermal Performance Value (ATPV) or Energy Breakopen Threshold (EBT) of face protective products. The resulting arc rating is expressed in cal/cm², allowing users to match the face protection to the anticipated incident energy hazard.
Complete System Evaluation
Unlike material-only testing, ASTM F2178 evaluates the entire face protection assembly, including:
- Face shield or visor
- Hood materials
- Chin cups
- Helmet interfaces
- Mounting hardware
- Viewing windows
This ensures the complete system performs as intended during an arc flash event.
Heat Transfer Measurement
The test measures the amount of thermal energy transmitted through the face protection system. Sensors positioned behind the product determine the level of energy reaching the wearer and establish the arc rating.
Physical Performance Requirements
Products are evaluated for:
- Melting
- Dripping
- Ignition
- Structural failure
- Lens distortion
- Break-open events
- Component separation
The standard ensures that protective equipment maintains its integrity during arc exposure and does not introduce additional hazards to the worker.
Optical and Visibility Requirements
Because face shields and visors are used for electrical work requiring visual accuracy, ASTM F2178 includes requirements for:
- Light transmission
- Optical clarity
- Visibility through the viewing area
- Post-exposure lens performance
This helps ensure workers maintain adequate vision before, during, and after exposure conditions.
Product Classification and Labeling
ASTM F2178 requires manufacturers to clearly label products with their tested arc rating and provide information necessary for proper PPE selection and use. This supports compliance with standards such as NFPA 70E and CSA Z462.
