Dear Sir,
From my knowledge , Sa2.5 or SSPC SP10 is level of cleanliness of surface preparation. Roughness should be the measurement of surface profile which is necessary for adhesion of a certain type of coating. Normally painting supplier will recommend to have surface preparation meet criteria of both properties to assure his painting performance. ( see attached highlighted clause as sample ). Very clean surface like Sa3 but not enough profile can create problem but select wrong size of grit can result in unnecessary too deep profile and make painting waste much more than normal.
Regards,
C.Nopadon
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Pieper QSI
Sent: Friday, December 23, 2011 5:08 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
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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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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