Cobalt blue optical filters for welding goggles From YOUJIA OPTICAL
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Name
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120*60*3mm cobalt blue optical filters for welding goggles
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Thickness(mm)
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0.5-30mm
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Size tolerance
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+/-0.02mm
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Edge Finish
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Ground and beveled
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Surface Quality
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60-40 scratch-dig
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Surface Flatness
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λ/4 @ 633 nm
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Parallelism
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≤3 arc min (≤0.9 mrad)
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Transmistance
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>90%
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