finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing

HomeFAQsSuggested
Books
Help
Wanteds
Advertise
on this site
FORUM
(current
topics)
topic 9084

Discolouration of red and orange coloured anodising layer


(2001)

Q. We have some anodised Aluminum parts that's dyed in orange and red. After exposure to sunlight (a few days), we've found the colours had gone lighter. I understand some organic dyes are not UV resistant, but can it be improved? And is there any type of dye we can use? Which kinds of colours are not recommended for UV exposure?

WY Wong
- HK


(2001)

A. If the dyes are not UV resistant, you can not do much about it. However, you can try the following methods to improve your situation:

- Increase the depth of the shade can increase the lightfastness.

- Increase the thickness of anodic coating and/or lower dye concentration and dye at 60 °C (you may need to increase the dye time).

- Increase seal time and seal at boil.

Good Luck.

S. Y. Yuen
- Hong Kong, China


(2001)

A. Most dyes that all the major makers of dyes make are not to be used for outside exposure. They are recommended only for internal. Clariant has a section of dyes that go by the title of Sandalor (when they were Sandoz chemical) and then the subsequent color they attach to it, for example Sandalor Red, etc etc. These are the only suitable dyes for exterior use and even still their abilities to withstand light are unknown in terms of long term exposure. If anyone has information on test done to confirm lifespan on dyes I'd love to see it myself.

Matthew Stiltner
- Toledo, Ohio



This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView CURRENT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2017 finishing.com     -    Privacy Policy
How Google uses data when you visit this site.