Lisan ühe normaalse inglise keelse kokkuvõtte Z87 kohta. Jälgige "+" markerit ja high velocity katse reaalseid genereeritud džaule!! Kasutatakse küll teraskuuli, aga kuna kiirus on väiksem siis džaulid on ka väiksemad, isegi väiksemad kui airsofti BB'l kiirest relvast!
Z87 Safety Standards
There's several different versions of the ANSI Z87 standard with the current version being Z87.1-2010. The the basic Z87.1-2010 and Z87.1-2003 standards do not REQUIRE impact testing.
The "Impact protector" (Z87.1-2010+) and "High impact" (Z87.1-2003+) sub-standards are the impact part of Z87. Both use a "+" symbol in the markings. This you be looking for eye protection marked "Z87+" or "Z87-2+" (the "-2" is used in the 2010 standard for RX lenses). Protection marked "Z87" and "Z87-2" (no "+") ARE NOT IMPACT RATED.
Different types of eyewear are required to meet different standards to be Z87+ impact rated (see below).
There are also Z87 ratings for light filters, UV filters, IR filters, tints, etc.. These may be marked with "W", "U", "L", "V", "H", and "S" (some with numbers) on the frame or lenses.
For the "Z87+" impact standard, the relevant "High Velocity" impact is testing:
- For glasses, they are shot with a 6.35mm diameter, 1.05 gram, steel ball at 150 fps (1.09 joules)
- For goggles, they are shot with a 6.35mm, 1.05 gram, steel ball at 300 fps (4.39 joules).
Each test is repeated six times under the current Z87.1-2010 standard. The older Z87.1-2003 standard tests required 20 hits.
In addition, Z87.1-2010+ and Z87.1-2003+ testing requires a "Drop-Ball Impact" test where a 1 inch diameter steel ball (66.9 grams) on the goggles from 50 inches (impacting at 8.3 fps with 0.21 joules). There is also a "High Mass Impact" test where a 500 gram "pointed" weight dropped from 50 (2010) or 60 (2003) inches (impacting at 8.3 or 8.9 fps with 1.61 or 1.82 joules).None of these tests are relevant to airsoft BB impacts, though it may help if run face-first into a tree.
The troubling thing is none of the Z87+ tests are faster than 300 fps, and some Z87+ eye protection isn't tested beyond 150 fps.
MIL SPEC MIL-PRF-32432 and MIL-PRF-31013
The standards cover things like weight, optical clarity, mildew resistance (really), usability with issue helmets and gunsights, degredation over time from sunlight exposure, etc., but for for airsoft protection what we really care about is impact resistance.
The old document was MIL-PRF-31013 clause sections 3.5.1.1 (spectacles) and 3.5.1.10 (goggles) and the new document is MIL-PRF-32432 section 4.4.3.3.4 and 4.4.3.3.5. The actual tests are the same in both documents.
- Glasses ("spectacles") are shot with a shaped steel projectile 3.81mm diameter, 0.379 grams in mass, at 650 fps (7.438 joules) ONCE.
- Goggles are shot with a shaped steel projectile 5.588mm in diameter, 1.102 grams in mass, at 550 fps (15.48 joules) THREE TIMES.
Impacts are from the front (slightly off center of the lens). The shape of the projectile is basically a pointy cylinder.
