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Home  > Forum  > Coatings & raw material failures  > Change in color

Monday, 17 June 2019

Change in color

3 Posts

Wednesday 12 March 2008 1:00:00 am

I have a problem with a black coating changing to white in some localized areas after 24 hours of UV curing. The part is also black and is made in ABS. Does somebody have any idea for avoid this change?

Thank you

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Tuesday 01 April 2008 1:00:00 am

Dear Angelica,
I think the residual unreacted styrene in ABS plastic is reacting with the monomers and oligomers in UV curable coating.
ashish bhansali

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Monday 05 May 2008 1:00:00 am

Probably the change of black to white is due to change of refractive index of film. Maybe there is various reasons: the solvent of the film is occluded. Poor wetting of the pigment. It can have a separation of the pigment of the cured film. Is it a black u.v. coating or is a clear coating over black primer?Is there a lot of material in these white areas?

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Monday 26 May 2008 1:00:00 am

I am rachel . I just know our Thermochromic pigment and Photochromic pigment could change color when it meet different temperature and light

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