Here's one that came about from out of left field!
While at my Brothers house on Sunday and thumbing thru a current book on boat repair I came across a statement that Polyester never cures and is always out gassing and getting brittle and dry.
I new this about many plastics and the Dash board and such in cars drying out and cracking is a classic example of such, but even with out the UV factor as in plastic in cars going south, how if anything will The out gassing of Polyester caps effect there life?
Cap question
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Stevem
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Cap question
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Re: Cap question
I believe that the comment that "polyester never cures" was in reference to polyesters used in boat building and finishing. I have some experience with catalyzed polyester casting, and it can be a problem. If you don't do special things, it can remain slightly sticky forever.
However, I can assure you that with proper processing in a controlled industrial setting (very unlike boat repair) polyester curing does go to completion. That is the case for polyester film products. Much of the plastic film packaging in the world is polyester film. Think "Mylar", which is a trade name for polyester film. Mylar and other polyester films are used for archival purposes for artwork. Not possible if the film gets sticky or outgasses.
The films used for polyester caps are chosen for high stability, and processed accordingly. They can't stand to "never cure". So it's extremely unlikely that it will be outgassing.
The "getting brittle and dry" is a problem with plastics that have, as you note, been subjected to heating and UV when they have previously been made supple by filling them with "plasticizers", an additive that can make harder plastics more flexible. Plasticizers are typically not used in polyester films intended for electronics use because component designers know full well about flex and outgassing, and don't want it in their products.
Net - your polyester film caps are not going to die from outgassing or dry-and-crack in any forseeable time. They'll outlive you.
However, I can assure you that with proper processing in a controlled industrial setting (very unlike boat repair) polyester curing does go to completion. That is the case for polyester film products. Much of the plastic film packaging in the world is polyester film. Think "Mylar", which is a trade name for polyester film. Mylar and other polyester films are used for archival purposes for artwork. Not possible if the film gets sticky or outgasses.
The films used for polyester caps are chosen for high stability, and processed accordingly. They can't stand to "never cure". So it's extremely unlikely that it will be outgassing.
The "getting brittle and dry" is a problem with plastics that have, as you note, been subjected to heating and UV when they have previously been made supple by filling them with "plasticizers", an additive that can make harder plastics more flexible. Plasticizers are typically not used in polyester films intended for electronics use because component designers know full well about flex and outgassing, and don't want it in their products.
Net - your polyester film caps are not going to die from outgassing or dry-and-crack in any forseeable time. They'll outlive you.
"It's not what we don't know that gets us in trouble. It's what we know for sure that just ain't so"
Mark Twain
Mark Twain
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Stevem
- Posts: 5144
- Joined: Fri Jan 24, 2014 3:01 pm
- Location: 1/3rd the way out one of the arms of the Milkyway.
Re: Cap question
I'LL be 62 in May, so I guess they will out live me , lol!
Thanks for the info as always!
Thanks for the info as always!
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!