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Protective N 8 finish

Kindly let me know what is Protective N 8 finish in aluminum jobs ?

Sharnpal Singh Taggar
central tool room a-5 , focal point , ludhiana - India
2006

2006

Perhaps a Roughness Grade Number?
N8 is an Ra of 3.2 microns -- see letter 7560.

Ken Vlach [deceased]
- Goleta, California

Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at finishing.com, continue to benefit from.

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