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#1
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prepreg fiberglass question
I've heard of prepregs which have the resin and hardener separated
within the fabric, which can be activated by applying pressure with a squeegee or similar tool. I searched the internet but I can only find the standard premixed prepregs which need to be kept in a refrigerator and cured at elevated temperatures. Anyone know what I am talking about or where I can buy this thing? I am basically looking for a way to avoid having to hand make long lengths of fiberglass tapes for noncritical applications. But it has to cure fast at room temperature like any standard epoxy so the premixed ones won't work. Thanks! |
#2
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prepreg fiberglass question
Andrew Sarangan wrote:
I've heard of prepregs which have the resin and hardener separated within the fabric, which can be activated by applying pressure with a squeegee or similar tool. I searched the internet but I can only find the standard premixed prepregs which need to be kept in a refrigerator and cured at elevated temperatures. Anyone know what I am talking about or where I can buy this thing? I am basically looking for a way to avoid having to hand make long lengths of fiberglass tapes for noncritical applications. But it has to cure fast at room temperature like any standard epoxy so the premixed ones won't work. Thanks! Prepregs are literally pre-impregnated with catalyzed resin. They are kept from hardening by being kept at low temperature. It has nothing to do with pressure - certainty not from something as flimsy as a squeegee. Sounds like you need to hit the books. There are LOTS of tehm. Try Amazon? Richard -- (remove the X to email) |
#3
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prepreg fiberglass question
On May 12, 9:58 am, cavelamb himself wrote:
Andrew Sarangan wrote: I've heard of prepregs which have the resin and hardener separated within the fabric, which can be activated by applying pressure with a squeegee or similar tool. I searched the internet but I can only find the standard premixed prepregs which need to be kept in a refrigerator and cured at elevated temperatures. Anyone know what I am talking about or where I can buy this thing? I am basically looking for a way to avoid having to hand make long lengths of fiberglass tapes for noncritical applications. But it has to cure fast at room temperature like any standard epoxy so the premixed ones won't work. Thanks! Prepregs are literally pre-impregnated with catalyzed resin. They are kept from hardening by being kept at low temperature. It has nothing to do with pressure - certainty not from something as flimsy as a squeegee. Sounds like you need to hit the books. There are LOTS of tehm. Try Amazon? Richard -- (remove the X to email) I am very familiar with the standard prepregs and how to work with them (as I indicated on the original post). But the type I am thinking of is an unusual type. It has the resin and hardener separated by a thin membrane inside the glass, and when you squeeze it hard the membrane ruptures and mixes the two components (I think the color also changes to indicate proper mixing). If you have a reference or vendor for this item, I would appreciate any info. |
#4
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prepreg fiberglass question
Andrew Sarangan wrote:
On May 12, 9:58 am, cavelamb himself wrote: Andrew Sarangan wrote: I've heard of prepregs which have the resin and hardener separated within the fabric, which can be activated by applying pressure with a squeegee or similar tool. I searched the internet but I can only find the standard premixed prepregs which need to be kept in a refrigerator and cured at elevated temperatures. Anyone know what I am talking about or where I can buy this thing? I am basically looking for a way to avoid having to hand make long lengths of fiberglass tapes for noncritical applications. But it has to cure fast at room temperature like any standard epoxy so the premixed ones won't work. Thanks! Prepregs are literally pre-impregnated with catalyzed resin. They are kept from hardening by being kept at low temperature. It has nothing to do with pressure - certainty not from something as flimsy as a squeegee. Sounds like you need to hit the books. There are LOTS of tehm. Try Amazon? Richard -- (remove the X to email) I am very familiar with the standard prepregs and how to work with them (as I indicated on the original post). But the type I am thinking of is an unusual type. It has the resin and hardener separated by a thin membrane inside the glass, and when you squeeze it hard the membrane ruptures and mixes the two components (I think the color also changes to indicate proper mixing). If you have a reference or vendor for this item, I would appreciate any info. Sorry, Andrew, never heard of them in private hands, Richard -- (remove the X to email) Now just why the HELL do I have to press 1 for English? John Wayne |
#5
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prepreg fiberglass question
On May 12, 9:05*am, Andrew Sarangan wrote:
On May 12, 9:58 am, cavelamb himself wrote: Andrew Sarangan wrote: *I've heard of prepregs which have the resin and hardener separated within the fabric, which can be activated by applying pressure with a squeegee or similar tool. I searched the internet but I can only find the standard premixed prepregs which need to be kept in a refrigerator and cured at elevated temperatures. Anyone know what I am talking about or where I can buy this thing? I am basically looking for a way to avoid having to hand make long lengths of fiberglass tapes for noncritical applications. But it has to cure fast at room temperature like any standard epoxy so the premixed ones won't work. Thanks! Prepregs are literally pre-impregnated with catalyzed resin. They are kept from hardening by being kept at low temperature. It has nothing to do with pressure - certainty not from something as flimsy as a squeegee. Sounds like you need to hit the books. There are LOTS of tehm. Try Amazon? Richard -- (remove the X to email) I am very familiar with the standard prepregs and how to work with them (as I indicated on the original post). But the type I am thinking of is an unusual type. It has the resin and hardener separated by a thin membrane inside the glass, and when you squeeze it hard the membrane ruptures and mixes the two components *(I think the color also changes to indicate proper mixing). If you have a reference or vendor for this item, I would appreciate any info.- Hide quoted text - - Show quoted text - I have seen what you are discussing in a clay like form but never in an impregnated glass. The concept sounds great but I can't see how you would ever achieve a good and consistant mixture. |
#6
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prepreg fiberglass question
On May 11, 9:56*pm, Andrew Sarangan wrote:
...I am basically looking for a way to avoid having to hand make long lengths of fiberglass tapes for noncritical applications. But it has to cure fast at room temperature like any standard epoxy so the premixed ones won't work. For that application I'd be inclined to consider pre-pregging chunks of cloth with UV-curing vinylester, and sandwiching it between two sheets of one-mil nylon sheet. Chuck it into a ziploc bag in a dark cabinet. Then cut strips of tape off the edges and use them at need. After applying, zap with UV light or just point at the sun. Thanks, Bob K. |
#7
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prepreg fiberglass question
On Sun, 11 May 2008 21:56:48 -0700 (PDT), Andrew Sarangan
wrote: I've heard of prepregs which have the resin and hardener separated within the fabric, which can be activated by applying pressure with a squeegee or similar tool. I searched the internet but I can only find the standard premixed prepregs which need to be kept in a refrigerator and cured at elevated temperatures. Anyone know what I am talking about or where I can buy this thing? I am basically looking for a way to avoid having to hand make long lengths of fiberglass tapes for noncritical applications. But it has to cure fast at room temperature like any standard epoxy so the premixed ones won't work. Thanks! If this stuff doesn't exist, based on the responses, I would suggest patenting the concept. Imagine a two (or greater) sandwich of S glass, with encapsuated layers of resin and catalyst. The fabric is draped over a male plug (permanent or removable). It is then vacuum bagged. The compressive force of the vaccuum ruptures the encapsulations and the binary system begins to mix. A vibrating or centrifugal base could be used to acheive optimal mixing of the components. What you could wind up with is a near perfect composite structure,not dependent on squeegee force or perfect application of squeegee pressure (impossible given time constraints and the stress from time pressure). If it does exist, I'd like to know how to obtain it also. T.L. Davis |
#8
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prepreg fiberglass question
"T.L. Davis" wrote in message ... On Sun, 11 May 2008 21:56:48 -0700 (PDT), Andrew Sarangan wrote: I've heard of prepregs which have the resin and hardener separated within the fabric, which can be activated by applying pressure with a squeegee or similar tool. I searched the internet but I can only find the standard premixed prepregs which need to be kept in a refrigerator and cured at elevated temperatures. Anyone know what I am talking about or where I can buy this thing? I am basically looking for a way to avoid having to hand make long lengths of fiberglass tapes for noncritical applications. But it has to cure fast at room temperature like any standard epoxy so the premixed ones won't work. Thanks! If this stuff doesn't exist, based on the responses, I would suggest patenting the concept. Imagine a two (or greater) sandwich of S glass, with encapsuated layers of resin and catalyst. The fabric is draped over a male plug (permanent or removable). It is then vacuum bagged. The compressive force of the vaccuum ruptures the encapsulations and the binary system begins to mix. A vibrating or centrifugal base could be used to acheive optimal mixing of the components. What you could wind up with is a near perfect composite structure,not dependent on squeegee force or perfect application of squeegee pressure (impossible given time constraints and the stress from time pressure). If it does exist, I'd like to know how to obtain it also. T.L. Davis Something sensitive enough to be ruptured by a vacuum bag would be real susceptible to handling damage. A single blem in a large panel could scrap a lot of expensive material. The UV-curing vinylester would seem more user friendly. |
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