Flamemaster CS-3209 B - STM40-109 - Electrically Conductive Fuel Resistant Sealant

CS 3209 Class B is a two-part, manganese dioxide cured polysulfide sealant uniquely engineered to be electrically conductive while providing excellent fuel resistance for aerospace applications. This innovative sealant incorporates conductive fillers, typically silver-coated particles, to create a low-resistance path, allowing for effective grounding or protection against static electricity and lightning strikes. The "Class B" designation indicates its trowelable consistency, making it suitable for application by spatula or extrusion gun for sealing seams, fasteners, and small access panels. Upon curing at room temperature, CS 3209 Class B forms a tough, flexible, and resilient rubber that maintains its integrity and conductivity even when exposed to aviation fuels, lubricants, and varying temperatures, ensuring both structural integrity and electrical continuity.

Key Features for Aviation:

• Two-Part System: Composed of a base compound and an accelerator, mixed immediately prior to application.
  Polysulfide Chemistry: Provides outstanding resistance to a wide range of aviation fuels, hydraulic fluids, and lubricants.
  
• Electrically Conductive: Contains conductive fillers (e.g., silver-coated glass beads or other conductive particles) to ensure electrical continuity across sealed joints, critical for grounding and EMI/RFI shielding.
  
• Manganese Dioxide Cure: A robust curing agent that contributes to the sealant's durable properties.
  
• Class B Consistency: Trowelable, making it easy to apply with a spatula, spreader, or extrusion gun for filleting and sealing.
  
• Excellent Adhesion: Forms strong, durable bonds to typical aircraft substrates, including aluminum, titanium, stainless steel, and composite materials.
  
• Superior Fuel and Fluid Resistance: Highly resistant to aviation jet fuels (JP-4, JP-5, JP-8, Jet A/B), hydraulic fluids (e.g., Skydrol), and engine oils.
  Wide Service Temperature Range: Maintains flexibility, sealing properties, and conductivity across the typical operating temperatures of aircraft.
  
• Flexibility and Resilience: Cures to a flexible, rubbery seal that can withstand aircraft vibrations, thermal cycling, and structural movement without cracking or delamination.
  
• Good Work Life (Pot Life): Provides sufficient time for application before curing, depending on the specific "B" class variant (e.g., B-1/2, B-2, B-4).

Typical Aviation Applications:

• Sealing Integral Fuel Tanks with Grounding Requirements: Used in fuel tanks where components (e.g., fuel probes, sensors) need to be electrically grounded to the airframe, or where lightning strike protection needs to be maintained across joints.
  
• Fastener Sealing with Conductivity: Applied around conductive fasteners (rivets, bolts) in fuel tank areas to ensure electrical continuity across the joint and prevent fuel leaks.
  
• Static Dissipation: Used to dissipate static electricity buildup in areas exposed to fuel, reducing the risk of ignition.
  
• EMI/RFI Shielding: Can contribute to maintaining electromagnetic interference (EMI) and radio frequency interference (RFI) shielding continuity across panel joints in fuel-wetted or electrically sensitive zones.
  
• Repair of Electrically Conductive Seals: Used for repairing existing electrically conductive fuel tank seals that have degraded.
  
• Fuel System Component Bonding: Applied where certain fuel system components need to be both sealed and electrically bonded to the surrounding structure.

• All in-stock orders are processed within 1–2 business days (excluding weekends and holidays) after receiving your order confirmation email.
• Orders with a lead time will ship according to the estimated shipping time shown on the product page.
• If we experience a high volume of orders or if an item is backordered, processing times may be slightly delayed. We will notify you promptly via email.

• Returns must be made within a maximum of 3 business days after receiving the product, with prior authorization from Aircraft Shop Supply (Return Material Authorization). Returns without prior notice or written authorization will not be accepted.
• For products with 3 to 6 months of remaining shelf life, claims must be made within the next 2 business days after receipt.
• Returns are not accepted for products with less than 3 months of remaining shelf life.
• Returns are not accepted for products purchased during a low Shelf Life promotion, items sold with discounts, or special orders that must be placed directly with the factory.
• The customer is responsible for the return shipping cost, except in cases where the return is due to an error on the part of Aircraft Shop Supply.
• Refunds will only be issued after the product has been inspected and no damage is found.
• A 25% Restocking Fee will be charged for returns of products in good condition that are either no longer needed or were ordered incorrectly.
• A 35% Restocking Fee will be charged for returns of products with one year or less of remaining shelf life.
• No Restocking Fee will be charged if Aircraft Shop Supply is responsible for incorrectly shipping a product, or if the order is damaged upon leaving the warehouse.
• Hazardous Materials & Dangerous Goods: These items are sold as final and are not eligible for return approval.