EXCESS DFT OF PAINT

[vinu raveendran]

Dear Friends!

I would like to know if there is any problem in DFT of paint which is actually 2 times the specified DFT. And how do i correct this problem.? Should i remove the paint?

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VINU RAVEENDRAN

[Arun Yadav]

Dear Vinu,

For DFT there is two possible ways

1-Remove the DFT by emery paper (It is not advisable for 100% area because it may remove all paints instead of required paint dft).
.2-Remove the paint and do the all process like blasting and paint coating.


Regards
Arun
EIL

--
VINU RAVEENDRAN

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[Pieper QSI]

Dear Vinu,

 

It completely depends on your paint specification, in general DFT is the minimum average film thickness.

 

For example ISO 19840 specifies the measurement of, and acceptance criteria for, the thickness of dry films on rough surfaces.

I’m not 100% sure but as far as I know this specification allows a maximum of three times the specified DFT as maximum.

 

Met vriendelijke groeten / Best Regards,

 

Herman Pieper

QA-QC Inspector / IWI-C / IWT / Materials expert

 

Job van der Havestraat 6

8384 DB, Wilhelminaoord

Tel: 06-51691215

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[Sandeep K P]

Dear Mr.Vinu,

DFT thickness shall not be varied more than + / - 20% of required thickness (refer SSPC PA2 - CL# 4.3.1 & 4.3.2).

And also we have to refer client provided project specification for final acceptance. 

Thank you,

 

Sandeep.k.p

QA/QC Inspector

Dubai,UAE

Mob:- +971 557405828

sandee...@gmail.com

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[sevak hiren]

Dear ,

Only individual values at some locations are allowed max 3 times the nominal DFT as per ISO -12944-5 (As outlined in ISO 19840).

Not the complete area...

But as per my opinion in general, The minimum DFT should be atleast 80% of nominal DFT & maximum DFT should be 120% of nominal DFT.

I think you should consult the paint manufacturer.

Here is the extract of ISO 19840.


Here is the extract of 12944-5

[manpreet]

Hi Mate,

ISO 12944-5 Sec 5.4 states that “It is recommended that the maximum dry film thickness (individual value) is not greater than THREE TIMES the nominal dry film thickness.”

Do some tests such as adhesion test and solvent rub test.

Cheers.


On Sun, 14 Oct 2012 14:39:23 +0530 wrote
>Dear Friends!I would like to know if there is any problem in DFT of paint which is actually 2 times the specified DFT. And how do i correct this problem.? Should i remove the paint?

--
VINU RAVEENDRAN

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>
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[kumar mahesh]

Dear Vinu

As the DFT increases it will lead to cracking  if the particular substrate is under going for bending

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Chichula Mahesh Kumar
+91 9700081617

[Declan Foley]

Vinu,

The specified DFT will probably be a minimum, you are supplying

More corrosion protection than is required,

Your client may be quite happy with this,

Why don't you ask them. It is better to have too much

Than not enough

Declan

Sent from my iPhone