MIL SPEC antifreeze

[Schmoe]

Does anyone know if the "formula" has changed on milspec antifreeze? Been doing waste profiles under RCRA and had used antifreeze tested. It came back "hot" for selenium, over the 1.0 ppm limit. I've never seen that show up before. Just what or where does the selenium come from. Turned this stuff into a D listed waste.

 

[mojo]

Up to 1997, the military used a formulation based antifreeze MIL-A-46153. This had a specified compostion that was water, trisodium phosphate, ethylene glycol, vicinal glycols, sodium tetraborate, sodium salt of tolytriazole, a dye, and antifoaming agent. There was no requirement for selenium as I see it. Since 1997, the military has been using a commercial item description CID A-A-52624A which is a performance type specification. Although it has to meet the performance requirements of two existing ASTM standards for antifreeze, the CID does have a requirement to have a maximum silicon concentration of 250 parts per million. Hope this helps.