Grit blasting surface roughness ISO 8503
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Application of comparison samples after blasted surfaces according to ISO 8503-1:
Select the appropriate surface profile reference comparator to ISO 8503 ( Order-No. 921.217 Roughness specimens
to "shot blasting Type S" or Order-No. 921.218 Roughness specimens to "grit blasting Type G") and place it against
an area of the test surface. Compare, in turn, the test surface with the four sectors of the comparator directly or by
using a hand lens with magnification not exceeding X7, placed so that the test surface is viewed simultaneously with
a segment of the comparator. Asses the profiles on the comparator that are nearest to the profile of the test surface and,
from these, determine its grade.
Fine Grade: Profiles equal to Segment 1 and up to but excluding Segment 2
Medium Grade: Profiles equal to Segment 2 and up to excluding Segment 3
Coarse Grade: Profiles equal to Segment 3 and up to excluding Segment 4
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