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

topic 736

Finishing aluminum for special optical properties


I have a spacecraft application, and need a process (anodize or some other) which will provide Absorptance, Alpha < .65 and a ratio of Absorptance to Emittance (Alpha/Epsilon)< .8

I am trying to avoid paints, and am hoping to find an anodize or plating process. I have heard that Sulfuric Acid anodize may work but I don't have data.

If you have any info or suggestions please let me know.

-John Z.

John Ziavras

A website with solar absorptance "a" and normal emittance "e" values for various coatings from NASA-GSFC can be found at:

Based on this data, clear anodize will meet your needs.
a = 0.27-0.35
e = 0.76-0.84

Chris Jurey, Past-President IHAA
Luke Engineering & Mfg. Co. Inc.
supporting advertiser
Wadsworth, Ohio

luke engineering banner

Ed. note: that site no longer exists, so we have struck thru the URL

Apply for a free subscription to NASA Tech Briefs . . ." BORDER=0 style="vertical-align:bottom">


There's an article in the Nov. '96 NASA Tech Briefs (vol. 20 No.11) page 69, that may be of interest to you.

Derek Vanek
Independence, Ohio


We have worked with Rocket Research on Thermal Emittance values in anodizing for space station freedom & McDonnell Douglas, Please contact us.

Max T. Faeth
- Los Angeles, California, USA

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 This Week's HOT 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     -    Privacy Policy
How Google uses data when you visit this site.