Flamemaster CS-135 B1/2 Fuel Tank and Fuselage Sealant (AMS-S-8802 Type II /AMS-3276)

Flamemaster CS 135 is a two-part, synthetic rubber compound (specifically a polysulfide polymer) designed as a fuel tank and fuselage sealant for aerospace applications. It cures at room temperature to form a tough, flexible, and resilient seal with excellent adhesion to various aircraft substrates including aluminum, magnesium, titanium, and steel alloys. This sealant provides superior resistance to aviation fuels, jet oils, lubricants, hydraulic fluids, water, and weathering, ensuring long-term performance and structural integrity.

Key Characteristics:

• Two-Part System: Requires mixing of a base compound and an accelerator/catalyst.
  
• Polysulfide Based: Provides excellent fuel and chemical resistance.
  
• Room Temperature Cure: Cures without the need for external heat.
  
• Flexible and Resilient: Accommodates movement and vibration within the aircraft structure.
  
• Excellent Adhesion: Forms a strong bond with common aircraft materials.
  
• Wide Service Temperature Range: Maintains its properties across typical aircraft operating temperatures.
  
• Long Service Life: Offers durable and reliable sealing for extended periods.
  
• Resistant to Degradation: Withstands exposure to harsh aviation environments.
  

Application in Aviation:
Flamemaster CS 135 is primarily used for creating leak-proof seals in integral fuel tanks of aircraft. This is critical for preventing fuel loss and ensuring safe operation. Additionally, it is widely applied for sealing fuselage lap joints, seams, and access doors to maintain cabin pressurization and protect the internal structure from environmental elements like moisture and corrosion. The sealant is typically applied as a viscous paste using extrusion guns, spatulas, or other specialized tools to ensure complete filling of gaps and interfaces. Its flexibility allows it to withstand the stresses and strains experienced during flight.

• 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.