Goggle frames have letters and numbers mostly in the inner section or on either side. All work safety glass frames must comply with EN166 standards.
3 – Provides protection against liquid dropping and splashes. Mostly found in the goggle type that is completely closed around the eyes.
4 – Provides protection against large dust particles (5 microns and above).
5 – Provides protection against small dust particles (5 microns and below).
S – Resistant against impact caused by small objects moving at 12 mt/s speed.
F – Resistant against impact caused by small objects moving at 45 mt/s speed.
B – Resistant against impact caused by small objects moving at 120 mt/s speed.
A – Resistant against impact caused by small objects moving at 190 mt/s speed.
T – Resistant against impact at extreme temperatures.
2 – UV protection with a colored light filter that may alter color recognition (corresponding with EN 170)
2C or 3 – UV protection filter, allowing good color recognition (corresponding with EN 170)
4 – IR (infrared) protection (EN171). For example, protection from heat.
5 – Solar protection (EN172). Provides 100% UV sun glare protection but no IR (infrared) protection.
6 – Solar protection (EN172). Provides 100% UV sun glare protection and IR (infrared) protection.
1.2 – Allows more than 74.4% light transmission (less than 100%)
1.7 – Allows more than 43.2% light transmission, but less than 58.1%
2.5 – Allows more than 17.8% light transmission, but less than 29.1%
3.1 – Allows more than 8.0% light transmission, but less than 17.8%
1 – Class 1 high optical quality. Suitable for continuous use, refractive power ± 0.06 diopter.
2 – Class 2 medium optical quality. Suitable for infrequent use, refractive power ± 0.12 diopter.
3 – Class 3 low optical quality. Suitable for use in extraordinary situations, refractive power ± 0.25 diopter.
F – Resistant against impact caused by small objects moving at 45 mt/s speed.
B – Resistant against impact caused by small objects moving at 120 mt/s speed.
A – Resistant against impact caused by small objects moving at 190 mt/s speed.
T – Resistant against impact at elevated heat.