this has been on my mind for some time now...

how would acetelyne be for a second stage refrigerant. according to the data sheet (boiling point and such aside), it will form acetelytes when more than 63% copper is exposed to it. these acetelytes will form explosives if they come in contact with moisture from water, but since there is no water moisture in a dd system (if it has been propperly vacuumed) it should do nothing, right?

now, say that you were to use 50% steel and 50% copper tubing in a dd system, would this overcome the danger of forming acetelytes or would they still form due to the copper tubing being 100% copper?

thanks for any input