Need some help with Chemistry for a product

[stylinexpat]

Wondering if there are any geniuses here who know why discoloration takes place here turning this from clear white to a golden/brownish/yellowish color on just one side when placed under direct sunlight.. Key point to note as well is that there are two sides to this and only one side had changed color. Both sides have a sticky nano glue like substance. One side for suction cup mount and other to object like windshield. The side with discoloration taking place is inner side side where suction cup mount is mounted. Inside house with no sun no discoloration takes place but when placed under sun you can see what happens. Why does this happen and how can this be prevented? Why just one side and not the other? Inside an office or home it never changes color

 

[bunnspecial]

It's hard to guess without knowing the type of plastic and the specific composition of the glue. If I had it in the lab, I'd do a quick IR of the plastic, the discolored glue, and the undisturbed side. The two glue samples would be especially telling as it would tell what chemically is changing to give some clues as to what's going on.

Since cars tend to get a whole lot hotter than inside a household, it's also possible that whatever is mounted to it on the inside is offgassing something at in-car temperatures. The discoloration has a bromine red-brown color, and often times brominated compounds are used in plastics as a fire retardant, but I'm purely speculating on that being the cause.

 

[stylinexpat]

It's hard to guess without knowing the type of plastic and the specific composition of the glue. If I had it in the lab, I'd do a quick IR of the plastic, the discolored glue, and the undisturbed side. The two glue samples would be especially telling as it would tell what chemically is changing to give some clues as to what's going on.

Since cars tend to get a whole lot hotter than inside a household, it's also possible that whatever is mounted to it on the inside is offgassing something at in-car temperatures. The discoloration has a bromine red-brown color, and often times brominated compounds are used in plastics as a fire retardant, but I'm purely speculating on that being the cause.

Thanks for kind reply, 👍 Do you work in a lab?

 

[bunnspecial]

Yes, although not back again until June 30th.

I'm an analytical chemist by training and profession.

 

[stylinexpat]

Yes, although not back again until June 30th.

I'm an analytical chemist by training and profession.

That's quite some time. I guess you would need a full lab analysis to tell right..? I am not chemist here 😇 What do you reckon would be something to look for or ask for? Was going to ask manufacturer