NAFTOSEAL MC-780 C-1/3 (130-ml-Kit)

Additional Product Information

Overview

Naftoseal MC-780 Class C is a two-component polysulfide aircraft sealant designed for fuselage interfay sealing, wet riveting, and aircraft fuel tank sealing. Widely used across aviation manufacturing and MRO environments, it delivers long-term fuel and chemical resistance, strong adhesion across common aircraft substrates, and dependable performance in extreme temperatures. Aviation teams rely on this sealant for reliable leak prevention, structural protection, and adaptable cure times during both production and repair operations.

Key Technical Specs for Naftoseal MC-780 Class C

• Type: Two-component manganese-dioxide cured polysulfide sealant
• Size/Volume: Techkits (58–137 ccm), Kits (263–1050 ccm), Pails and Drums up to 162 L
• Color: Beige base / brown hardener (mixed color: brown)
• Viscosity/Consistency: 250–400 Pa·s at 23°C (73°F)
• Cure/Working Time: Application life variants from 20 minutes to 60 hours; accelerated curing possible up to 60°C (140°F)
• Peel Strength: ≥120 N/25 mm on aluminium and coated substrates
• Shore Hardness: Approx. Shore A 45 after full cure
• Service Temperature: −55°C to +130°C (−67°F to +266°F); short term +182°C (+360°F)
• Typical Uses: Fuselage sealing, fuel tank sealing, wet riveting, structural joint sealing

Approvals & Specifications

• Qualified to major aerospace OEM requirements
• Approved by Airbus, Bombardier, Embraer and other aircraft manufacturers
• Designed for aerospace fuel system and fuselage sealing applications

Typical Aircraft MRO / AOG Applications

• Aircraft fuel tank sealing and leak repair
• Fuselage interfay surface sealing
• Wet riveting of aircraft structures
• Sealing of structural joints and panels
• Maintenance, repair, and overhaul sealing operations

Compatibility & Safety Notes

• Compatible with aluminium, stainless steel, steel, titanium, composites and coated surfaces
• Epoxy primers typically require no additional adhesion promoter
• PUR and EP topcoats and composites may require adhesion promoter pre-treatment
• Use lint-free cloths and approved cleaners prior to application
• Wear appropriate PPE and follow Safety Data Sheet guidance

Packaging & Procurement

• Available in Techkits, Semkits, bulk kits, pails and drums
• Supports extrusion, injection gun and roller coating application
• Store below 26°C (78°F) for maximum shelf life
• Lower storage temperatures extend shelf life

Why Naftoseal MC-780 Class C is Chosen for AOG / MRO

• Excellent resistance to aviation fuels and chemicals
• Flexible cure profiles for varied repair timelines
• Reliable sealing in extreme temperature environments
• Self-filleting property improves sealing efficiency
• Trusted OEM-approved aerospace performance

Practical Suggestions for Your Team (AOG Mindset)

• Stock multiple working-time variants to support urgent and scheduled repairs
• Store in temperature-controlled environments to maximise shelf life
• Train technicians on surface preparation for optimal adhesion
• Use heated curing where possible to accelerate turnaround time

Manufacture / Aviation Spec Codes

• Manufacturer: Chemetall GmbH
• Product ID: Naftoseal MC-780 Class C
• Specification Reference: Aerospace OEM Qualified Product Lists (QPL)