Flamemaster CS-3808 Class B1/2 Silicone Sealant (BMS-8-68)

The Flamemaster CS-3808 Class B is the thixotropic, non-flow variant of the two-part RTV silicone compound, specifically engineered for applications requiring structural filling, gasketing, and fillet formation in extreme thermal environments. Unlike the brushable Class A, the Class B consistency allows for precision application on vertical and overhead surfaces without slumping or flowing.

Key Features for Aviation:

• CS-3808 Class B cures at room temperature to form a durable, flexible silicone elastomer with unparalleled resistance to heat and electrical stress. Its high viscosity is tailored for mechanical application via a pressure gun or spatula.

Typical Aviation Applications:

• Formed-in-Place Gasketing: Used extensively to create resilient, reusable gaskets for engine access panels, inspection covers, and high-heat assemblies.

• Structural Filleting: Applied to create robust fillet seals in joints and seams within engine nacelles, thrust reversers, and firewall areas where high heat is present.

• Void and Gap Filling: Ideal for filling large structural voids or gaps that demand a material with high volume resistivity and thermal stability.

• Missile/Rocketry: Used as an insulating coating and thermal barrier where the non-sag property ensures precise placement in complex assemblies.
  

• 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.