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, Sun, 16 Apr 2023 12:25:17
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I used the Chemseal B2 Tank Sealant based on a SaabNet recommendation from a number of years ago. Chemseal is a polysulfide sealant and some of the information I found is shown below. The fuel resistance seems certain, but there seems to be some concern about the use of polysulfide sealants on some plastics because the sealant can degrade the plastic. I have had a pinhole gas tank leak sealed with Chemseal for about three years now and so far so good. I would be interested to hear if anyone else has long-term experience with the sealant. Polyurethane sealants are also fuel resistant and may be an alternative.
Advantages of polysulfide adhesives for aerospace
Polysulfides have a number of properties that make them advantageous for use in aerospace manufacture. Importantly, they are highly resistant to jet and other fuels so they can be used to seal fuel tanks. They are also a good dielectric material, so they can be used for potting or sealing electronic components within tanks as well. Flexibility when cured allows polysulfides to withstand vibration, joint movement and impact experienced in travel. Polysulfide sealants are also resistant to thermal cycling and can withstand temperatures in the -80F to 250F range.
In addition to fuel tank applications, polysulfides find use in general fuselage sealing such as in gap filling between floor panels. They adhere well to materials used in aerospace manufacture including aluminum stainless steel and composites.
Polysulfides are the sealant of choice for many aerospace applications. Other adhesives and sealants usually can't match the combination of fuel resistance, adhesion and flexibility polysulfides offer. Modern formulations are also quite lightweight - allowing them to contribute to overall weight reduction in construction. Application is simple with brushing or troweling - meter-mix and pre-mixed packaging is also availabl
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, Sun, 16 Apr 2023 07:15:23, Mon, 17 Apr 2023 04:43:45
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