Such is the nature of a blasted surface.
Sa 2 5 surface profile measurement.
Ra roughness meter surface profilo meter astm d 4417 b.
There must be adequate.
For example on a panel blasted with a mixture of coarse and fine staurolite sands replica tape measurements ranged between 1 8 and 2 9 mils stylus instruments between 1 8 and 2 8.
Sspc sp6 b sa2 c sa 2 and d sa 2 sspc sp7 b sa1 c sa 1 and d sa 1 descriptions of the sspc standards can be found on page 22.
We are a leading manufacturer of sa 2 5 surface roughness comparator we offer a wide range of sa 2 5 surface roughness comparator these two comparators item 017 for shot blasting 018 for grit blasting are specially designed to check the roughness of steel surfaces which have been blast cleaned to cleanliness grades sa 2 5 and sa 3 before painting.
While two dft measurements might be expected to be very close two surface profile measurements can differ considerably.
Coarse and extra coarse the surface profile measurement almost is a mandatory requirement by most coating specifications.
The coarse tape was made for the surface profile of 0 8 thru 2 mil 20 to 50 μm and extra coarse tape made for 1 5 to 4 5 mil 37 to 112 μm.
Amplitude surface profile amplitude is a measurement given in microns that shows the difference between the peaks and troughs in a metal surface produced by blast cleaning.
Rubert surface comparators 2 figure 5 the surface profile measurement principle figure 7 the replica tape kit showing the tapes on the left and the dial gauge on the right figure 8 the replica tape method.
Sa 2 5 or sa 2 1 2 sa 3 shot blasting grit blasting comparators iso8503 sa 2 1 2 sa2 5 sa 3 shot grit sand blasting surface comparator.
Sa 2 5 or sa 2 1 2 sa 3 shot blasting grit blasting comparators iso8503 sa 2 1 2 sa2 5 sa 3 shot grit sand blasting surface comparator rubert elcometer tqc elcometer e125 1 grit blasting section profiles 25 60 100 150μm elcometer e125 2 shot blasting section profiles 25 40 70 100μm tqc ld2040 tqc ld2050 rubert 17.
Hopefully someone who is more knowledgeable about this will answer because i don t see how you can measure things that are covered by sa 2 5 like discoloration visible oil and greyness with a profilometer.
D7127 methods of measuring blast surface profile in addition astm d4417 11 provides an alternative way to measure the blast profile.
0 3 4 mm 0.
Figure 3 the keene tator surface comparator 1 with magnifier 3 and shot grit and sand discs.
Hi s p s.
Digital surface profile gauge to measure ra value on sand shot grit blasted surfaces.
