Sealant shelf life
Sealant shelf life
(OP)
Some people at my company wants to use PR1422 after the shelf-life has expired for economic reasons. Shelf-life is stated to be "at least 9 mo. when stored btw 40 and 60 F". Intended use after 9 mo. will be secondary sealing like floor boards, cargo liners etc. Not for structural repairs.
Being the one to write the instructions for the extended usage I am at loss as to whether this is possible and how long the extension might be.
The request is for 3 extra months.
Brgds
Dan
Being the one to write the instructions for the extended usage I am at loss as to whether this is possible and how long the extension might be.
The request is for 3 extra months.
Brgds
Dan





RE: Sealant shelf life
I believe BSS7002 allowed PR 1422 to be used based on its appearance. If the user isn't happy with the way it looks based on previous experience, don't use it.
RE: Sealant shelf life
Thanks, bf109g.
Meanwhile I discovered a huge number of outdated sem-kits. Will test them and see at what age they fail to e.g. cure.
I do not have access to BSS7002.
Dan
RE: Sealant shelf life
PR1422 meets AMS-S-8802
Yes the shelf life is 9 months.
But, good news, you can retest your material and extend the shelf life an additional 3 months if results are OK. You can retest up to three times.
Take a look at AMS-S-8802 for further details.
If you don't do this you are going to aeronautic's hell with eternal damnation.
RE: Sealant shelf life
OOOh, I do not want to go to aeronautic's hell, I'll call AMS right away.
RE: Sealant shelf life
Be careful referencing BSS 7002.
Even though this is a current Boeing document, Boeing does not allow this to be referenced for Shelf/Shop life requirements. They said this was for a specific program and can not be used for general reference.
I was trying to clarify a BSS7002 disparity and was chastised by the Spec owner for using it, even though it is still current.
RE: Sealant shelf life
In any event, I'm no longer in a position where I need to make these dispositions. I just provided my experience using BSS7002 as data acceptable to the FAA while working at XXX. Most of what I looked at was minutia like, believe it or not, tape. Anything like structural adhesives, sealants or protective coatings were kept to strict performance specfication requirements.
RE: Sealant shelf life
Thanks for your input.
I believe BSS 7002 is only a legal document within Boeing. It is generated by Boeing for Boeing use.
However, it is a good reference basis for your own organisation' s standards.
Dan