GS#424 Black MIL-S-11030F Type III Polysulfide Sealant Tape for Aircraft Structural Sealing
General Sealants GS#424 Black is a pre-formed polysulfide sealant tape meeting MIL-S-11030F Type III specification, designed for use as a faying surface sealant, gasket sealant, or joint sealant in aircraft structural applications. Its tape format eliminates the mess and waste associated with gun-applied sealants, providing consistent, pre-metered sealant thickness for uniform joint sealing across large production runs.
The black polysulfide formulation provides excellent fuel resistance, chemical resistance, and flexibility, maintaining a reliable seal over the wide temperature and pressure cycling range experienced by aircraft structures in service. MIL-S-11030F Type III classification indicates the sealant has been tested and qualified for aerospace structural sealing applications requiring a cured sealant with defined hardness, adhesion, and environmental resistance properties.
The 1/32 x 5/8 x 90 roll dimensions are optimized for panel lap joint and faying surface applications commonly encountered in aircraft skin panel and structural assembly, providing a pre-formed sealant bead of consistent cross-section for reliable joint sealing.
Product Specifications
| Attribute | Detail |
|---|---|
| Manufacturer Part Number (MPN) | GS424-MIL-S-11030F-1-32S-8X90 |
| Brand | General Sealants |
| Product Series | GS#424 |
| Specification | MIL-S-11030F Type III |
| Color | Black |
| Product Type | Polysulfide Sealant Tape |
| Dimensions | 1/32 inch x 5/8 inch x 90 foot Roll |
| Substrate | Metal, Composite, Aircraft Structure |
| Application | Tape / Pre-formed Faying Surface Sealant |
| Industry Use | Aircraft Assembly, Structural MRO |
Technical Information
GS#424 polysulfide sealant tape cures through a polysulfide oxidative crosslinking mechanism, developing its final mechanical properties and chemical resistance as the cure progresses after joint assembly. The pre-formed tape format ensures consistent cross-section thickness, preventing the over- or under-application issues that can occur with gun-applied sealants on production assembly lines.
The cured polysulfide film provides outstanding resistance to Jet A and JP-8 aviation fuels, hydraulic fluids, lubricating oils, and environmental moisture. Its inherent flexibility allows it to accommodate structural movement and thermal expansion/contraction without cracking or losing adhesion — critical properties for maintaining seal integrity over thousands of flight cycles.
Proper surface preparation including cleaning, deoxidizing, and application of compatible adhesion promoter per MIL-S-11030F requirements is essential before tape application. The tape should be applied with uniform hand pressure to ensure full contact with both faying surfaces before fastener installation compresses the joint to final thickness.
Why Choose GS#424 Sealant Tape?
- ✅ MIL-S-11030F Type III Qualified — Aerospace spec polysulfide sealing
- ✅ Pre-Formed Tape Format — Consistent thickness, no mixing or gun required
- ✅ Excellent Fuel Resistance — Maintains seal in fuel tank and wet zone areas
- ✅ Flexible Cured Film — Accommodates structural movement and thermal cycling
Frequently Asked Questions
Q: What applications is GS#424 tape used for?
A: GS#424 is used for faying surface sealing, lap joint sealing, and gasket applications in aircraft structural assembly and MRO where MIL-S-11030F Type III polysulfide sealant is specified.
Q: What dimensions does this roll come in?
A: This listing is for the 1/32 x 5/8 x 90 foot roll. MPN: GS424-MIL-S-11030F-1-32S-8X90.
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