Flamemaster CS-247 Class B2 Aircraft Windshield Sealant (AMS3333 Type II)

The Flamemaster CS-247 Class B2 is a highly specialized, two-part, polysulfide sealant formulated specifically for sealing transparent plastic windows and windshields in aerospace applications. This formulation is non-crazing and non-fogging, meeting the stringent requirements of AMS3333 Type II, which is essential for preserving the optical clarity and structural integrity of sensitive acrylic and polycarbonate materials. The Class B consistency is a thixotropic, non-sag paste suitable for creating robust fillets and beads. The B2 designation indicates a 2-hour application life, providing MRO technicians with ample time for detailed, large-area applications, cleanup, and complex joint sealing before the material begins to cure.

Typical Aviation Applications:

The CS-247 Class B2 is the preferred sealant for critical transparency sealing tasks requiring a longer working time:

• Large Window Filleting: Used to create the primary exterior fillet seal around large passenger windows, complex cockpit windshields, and canopies (acrylic or polycarbonate).
  

• Stress Absorption: Forms a durable, flexible seal between the transparency and the frame, absorbing structural stress, thermal expansion, and vibration without inducing crazing or micro-cracking.
  

• Complex Assembly: The 2-hour work life is ideal for assemblies that require meticulous tooling, inspection, or simultaneous application across multiple joints by a team.

• 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.