Vacuum Bagging Films

Aerospace Vacuum Bagging Film & Sealant Tape

Vacuum bagging film and sealant tape are foundational consumables in aerospace composite repair and manufacturing. Bagging film forms the airtight enclosure over the composite layup; sealant tape seals the bag perimeter against the tooling surface to maintain vacuum integrity throughout the cure cycle. SkyGeek carries high-temperature nylon bagging film, vacuum bag sealant tape, and mold sealer from established composite processing brands including Airtech®, Tacky Tape®, General Sealants®, and Henkel Loctite®.

What Is Vacuum Bagging Film Used For in Aerospace?

Vacuum bagging film serves as the outermost layer of a vacuum bag assembly. Once sealed and connected to a vacuum source, it draws the composite layup tight against the tool surface throughout the oven or autoclave cure cycle. In aerospace maintenance and repair, bagging film is used for:
1. Bonded composite repairs to fuselage panels, control surfaces, fairings, and nacelles
2. Autoclave and oven processing of prepreg composite layups
3. Vacuum-assisted resin infusion and wet layup cure operations
4. Repair procedures governed by OEM structural repair manuals and composite repair programs

Vacuum Bag Sealant Tape

Vacuum bag sealant tape creates the airtight seal between the bagging film and the tool surface. Without a reliable seal, vacuum cannot be maintained during cure — leading to voids, poor consolidation, and non-conforming parts. SkyGeek carries standard and high-temperature sealant tape formulations from Tacky Tape®, General Sealants®, and Airtech®, including both tacky and butyl compound options to suit different tooling surfaces and cure cycle requirements.

Selecting the Right Vacuum Bagging Supplies

Bagging Film Width

Select a film width that covers the part with enough overlap to seal at the bag perimeter without requiring film seams. Seams introduce potential vacuum leak paths. Bagging film is available in a range of standard widths to accommodate small repair patches through large structural panel repairs.

Bagging Film Thickness

2 mil (.002"): Standard gauge offering good conformability across a range of vacuum bagging applications and part geometries.

3 mil (.003"): Heavier gauge with increased puncture resistance for complex geometries, rough mold surfaces, or repair environments where bag integrity is a higher concern.

Sealant Tape Temperature Rating

For standard and moderate-temperature cure cycles, a general-purpose tacky sealant tape is typically sufficient. For elevated-temperature autoclave or oven cures, specify a high-temperature formulation to ensure the seal remains intact throughout the full cure cycle.

Sealant Tape Compound

Tacky compound sealant tapes are the most widely used option for vacuum bagging applications. Butyl formulations offer an alternative sealing compound where process specifications or tooling requirements call for a different material.

For composite repair adhesives and additional consumables, visit SkyGeek's aerospace composites category.

SkyGeek has supported aerospace composite repair operations for over 40 years. Browse the full selection above to source bagging film, sealant tape, and vacuum bag consumables for your repair program. No membership or minimum order required.

Frequently Asked Questions

What is vacuum bagging film used for in aerospace composite repair?

Vacuum bagging film forms the airtight outer layer of a vacuum bag assembly used to consolidate composite layups during the cure cycle. In aerospace MRO, it is applied during bonded composite repairs to control surfaces, fuselage panels, fairings, and structural components, creating the vacuum environment needed for proper laminate consolidation and void reduction.

How do I choose the right width of vacuum bagging film?

Select a width that covers the part and provides enough margin to seal at the bag perimeter without requiring seams. Film is available in a range of widths to accommodate everything from small component repairs to large structural panel operations.

What is the difference between 2 mil and 3 mil vacuum bagging film?

The 2 mil (.002") film is the standard gauge for most aerospace vacuum bagging applications, offering good conformability over typical part geometries. The 3 mil (.003") film provides additional puncture resistance and is suited to complex geometry repairs, rough mold surfaces, or applications where a more robust bag is required.

What is vacuum bag sealant tape used for?

Vacuum bag sealant tape seals the perimeter of the vacuum bag to the tool surface. It is applied along the tool flange before the bag is laid up and pressed into contact. A reliable seal is essential - without it, vacuum cannot be maintained through the cure cycle, resulting in voids and poor laminate consolidation.

What is the difference between standard and high-temperature vacuum bag sealant tape?

Standard sealant tape formulations are suitable for room-temperature and moderate-temperature cure cycles. For elevated-temperature autoclave or oven processing, a high-temperature formulation must be specified to maintain seal integrity at higher cure temperatures. Using an incorrect sealant tape for the cure temperature can result in seal failure mid-cycle.

What is the difference between tacky and butyl vacuum bag sealant tape?

Tacky compound sealant tape is the most widely used option in aerospace vacuum bagging. Butyl formulations offer a different sealing compound that may be specified for particular tooling surfaces, process requirements, or when an alternative to tacky tape is called for in a repair procedure.

Can SkyGeek supply vacuum bagging consumables for a large composite repair program?

Yes. Bagging film is available in large-roll formats across a full range of widths, and select sealant tapes are available in case quantities.