Dear all,
As far as I know Sa2,5 indicates the surface cleaness (the rust grade) of the substrate see ISO 8501). Surface roughness calues can be estimated using surface profile comparators (e.g see EN ISO 8503)
Regards
S. Akyuz
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Pieper QSI
Sent: Friday, December 23, 2011 12:08 PM
To: materials-welding@googlegroups.com
Subject: RE: [MW:13277] Surface roughness measurement instruments.
Dear Mr. Rao,
Be aware that the microns you mention is not the surface roughness but the coating layer thickness (DFT = Drie Film Thickness).
For surface roughness you will have values like SA 2,5 microns or similar and in practice mostly the comparators are used for inspection prior to first layer of coating.
After fist coating layer there is no need to measure the roughness anymore.
Met vriendelijke groeten / Best Regards
Herman Pieper
Pieper Quality Support & Inspection
Phone: +31 (0)521 380083
Fax: +31 (0)84 7539225
Cell: +31 (0)6 51691215
www.pieper-qsi.nl
Van: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] Namens jsrisud@gmail.com
Verzonden: donderdag 22 december 2011 14:45
Aan: materials-welding@googlegroups.com
Onderwerp: Re: [MW:13259] Surface roughness measurement instruments.
Dear Mr. Rao,
There are portable surface roughness measuring instruments to measure as required.
UK based Rank Taylor Hobson instruments are available in India.
Srinivasan
Sent from BlackBerry® on Airtel
From: Vasantharao <vasantharao@yahoo.in>
Date: Thu, 22 Dec 2011 15:38:40 +0530 (IST)
ReplyTo: materials-welding@googlegroups.com
Subject: [MW:13256] Surface roughness measurement instruments.
Dear Experts,
I work as inspection Engineer. When i go for Blasting inspection, contractor provided me profile comparator for surface roughness measurement.
Contractor do Grit blasting in the shop.
I need to measure surface roughness - 75-100 microns Painting system No#1
50-75 microns Painting system No#2
Queries
Q 1: Comparator is enough for surface roughness measurements.
Q2: Is any other tools available for roughness measurement?.
Q3: What is the normal industry practice.
Pl. provide your valuable suggestions as i'm new for painting activities.
Rao.
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