3M™ Aerospace Ac-350 Class B-1/2 - 25 Gram Kit

Part# 09-05642
MFR Model# 7100094223


3Mô Aerospace Sealant AC-350 is a family of intermediate density, fast-curing, polysulfide fuel tank sealants that provides outstanding resistance to aviation fuels and petroleum chemicals. The Class A and B variants maintain bond strength on many metal, composite and coated substrates and help meet a range of applications for integral fuel tank and fuselage sealing.

The 3Mô Aerospace Sealant AC-350 family of polysulfide sealants provide a number of advantages and benefits compared to traditional sealants. With three classes, it meet a wide range of manufacturing and maintenance needs.
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  • Sealant resists aviation fuels and chemicals commonly used throughout the aviation industry
  • Various work lives and cure rates help meet a variety of process demands
  • Available in Class A, B and C to meet a range of requirements
  • Maintains bond strength on many metal, composite and coated substrates
  • Low shrinkage results in less rework


  • Application: Sealing
  • Application Life: 30 Minute
  • Brand: 3Mô
  • Capabilities: Aircraft Maintenance & Production Efficiency, Aircraft Sustainability, Aircraft Weight Reduction, Aviation Safety Enhancement
  • Color Brown
  • Cure Type: Fast Cure
  • Product Form: Kit
  • Product Volume: 0.5 Ounce
  • Storage Environment: Room Temperature

Class Distinction

  • When the Class A version is mixed, it provides a smooth pourable liquid that spreads evenly with a brush or roller to cover large areas quickly. Available in three different work lives, 3Mô Aerospace Sealant AC-350 Class A gives you the flexibility you need for various requirements. Rapid cure times keep your processes moving forward.
  • The Class B version mixes to a thixotropic paste that provides superb tooling properties when applied by injection gun or spatula. 3Mô Aerospace Sealant AC-350 Class B has no added solvents, which gives you more sealant by purchase volume and reduces the need for rework due to shrinkage. Available in multiple work lives, with rapid cure times, AC-350 increases your workflow flexibility.
  • Mixing the Class C version results in a flowable, faying surface grade material that is easily applied by brush, roller, spatula, or extrusion gun. Application and assembly times vary by product, allowing you to design flexibility into your workflow processes.
  • When used together, the Class A, B and C variants are ideal for sealing and/or repairing integral fuel tanks and sealing fuselages.
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Good product. Works as claimed by 3M.

Larry J Verified Purchase

3M AC TECH AC-350 B1/2 25G AMS-S-8802

June 16, 2021


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Can the 3M AC-350 be used on plastic fuel tanks?

This is designed to be used on metal substrates.

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