Military Specifications

Question:

You responded to a question on “Military Specifications” in the July issue of Products Finishing. If the person would like to talk to someone who is familiar with TT-C-490 and military paints, you could give him my name. TT-C-490, para. 3.2 requires preproduction approval for Type I and Type V coatings along with submission of phosphate coated panels and phosphate and painted panels for evaluation. The MIL-PRF-23377 is intended for use on chromated or anodized aluminum at the 0.0005 inch thickness but must be heavier when used on steel. However, 0.005 inch is excessive for this primer. If I can help in any way, feel free to contact me. J.M.

Answer:

In the July 2003, Painting Clinic, D. M. wanted technical information on applying the aforementioned coating as follows: "...Zn phosphating (TT-C-490D) and priming cylindrical forgings. The primer callout is MIL-PRF-23377G, Type I, Class C, (epoxy/catalyst, 4:1 mix, two part kit) to a minimum primer thickness of 0.0005 inch and combined Zn phosphate/Primer thickness of 0.005 inch. Where can I find “technical application information” for applying this primer to steel?"

Thanks for the information J. M. I didn’t think it was a good idea to publish your phone number in the Painting Clinic. You would be answering the phone all day. When I was the paint consultant for my company, my telephone rang incessantly. When I went home after work, I didn’t even want to look at a telephone.