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SURFACE TECHNOLOGY

Surface Finishes Table Guide

Description BS 1449 Part 2 BS EN 10088-2 RA um (approx.)

Reflectivity %
60deg(approx)

 Glos Units
COARSE GROUND 80 GRIT 3A 2G 2.5 10 N/A
240 GRIT ALUM/OXIDE 3B OR 4 2J 1.0 10 N/A
180 GRIT ALUM/OXIDE 3B OR 4 2J 1.25 10 N/A
240S SILICON CARBIDE NO.5 2K 0.4 30 N/A
240 IMAGE NO.5 2K 0.4 30/40 N/A
SATIN BRUSH (Long grain) 3B BRUSH 2K 0.2 35/45 N/A
SATIN BRUSH (Short Grain) 3B BRUSH 2K 0.2 35/45 N/A
BRIGHT POLISH NO.7 2P 0.05 53/60 580/620
MIRROR NO.8 2P 0.05 58/63 590/630


B.S 1449 Part 2 & euro Standard. EN10088-2
Please note: Reference to the above standards does not ensure conformity from different suppliers and processors.

Ra um (Roughness Average) or (CLA)
Internationally recognised parameter of Roughness
Units can be: um - microns - millionth of a metre
uinch - microinches - millionth of an inch

1 um is approximately 40 uinch