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 and damage claims must be made within a maximum of 3 business days after receiving the product, with prior authorization from Aircraft Shop Supply (Return Material Authorization - RMA). Returns without prior notice or written authorization will not be accepted. We strongly recommend inspecting the product upon delivery; many products require special storage conditions for which we are not responsible once they arrive to the client's facility. Please review the product's SDS for proper storage and handling.
• 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.

At Aircraft Shop Supply, we are committed to shipping the highest quality and freshest product possible. To ensure efficient stock rotation and meet aviation industry standards, our inventory management is governed by the following policy:

1. Scope of Application
All Sales Channels: This policy applies to all orders processed by Aircraft Shop Supply, including but not limited to: website purchases, direct email orders, formal Purchase Orders (POs), phone orders, and contract agreements.

2. Inventory Management (FIFO)
All products with an expiration date are managed and shipped on a strict "First In – First Out" (FIFO) basis.

3. Minimum Shipping Margin
Standard Guarantee: We will not ship any products with fewer than 30 days of use remaining (days before expiration), unless previously coordinated and agreed upon with the customer.

No Automatic Guarantees: Outside of this 30-day minimum margin, Aircraft Shop Supply does not make any automatic guarantee as to the specific length of time remaining on any shelf-life item for standard orders.

4. Special Customer Requirements
We understand that certain projects, maintenance schedules, or regulatory standards require strict specifications. If your order has specific shelf-life requirements, please proceed as follows:

How to Request: If you require a specific Date of Manufacture (DOM), Date of Expiration (DOE), or a specific minimum shelf-life percentage (%), you must clearly state this requirement:

In the Comments/Notes section when placing an online order.

Explicitly written on your Purchase Order (PO) or quote request email for offline orders.

Validation Process: Once your requirement is received:

We will ship your order if the available stock matches your specifications.

If we do not have the exact batch, we will contact you prior to shipping with the shelf-life percentage (%) or dates we have available for your acceptance.

5. Limitation of Liability and Validity of Information
To ensure transparency and manage expectations, the following terms and conditions apply:

Time-Limited Validity: Any information provided by our team regarding the remaining shelf-life percentage (%) is valid only at the exact time the inquiry is made. Due to high inventory turnover, availability is subject to change without prior notice.

Informational Purposes Only: Shelf-life data provided by Aircraft Shop Supply is strictly for informational purposes and reflects the availability at the moment of inquiry. It does not constitute a batch reservation or a product warranty.

Supply Chain Liability Exclusion: Aircraft Shop Supply is not responsible for the time elapsed or any product expiration that occurs after the order has been prepared and packed. This includes, but is not limited to: the time between order placement, carrier transit times, intermediary storage, customs delays, and final delivery to the end user. It is the customer's responsibility to account for these logistical lead times within their planning.