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What does "All surfaces Class 4" mean from an anodizer

December 14, 2009

Recently we received our 4th shipment of extruded and anodized parts from our extruder.
The previous 3 were perfect as per initial sample. This fourth shipment has just about all with unacceptable blemishes. We sent a small sample lot to them, and they say, all parts meet "Class 4" specification. I haven't been able to find anywhere what this class standards are. I would appreciate any help.

Thanks

Reginaldo Martinez
product designer - Mundelein, Illinois, USA

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