Flamemaster CS-9903 Primer (MIL-P-47215 / MMS-K328)

Flamemaster CS-9903 Primer is a single-component, solvent-based adhesion promoter specifically engineered to enhance the bond strength and durability of various silicone-based sealants and coatings, particularly Flamemaster CS-3808. It is designed to chemically modify the substrate surface, creating an optimal interface for the silicone to adhere to, especially on difficult-to-bond materials. This primer is a crucial step in achieving a reliable and long-lasting seal in demanding aerospace, missile, and electronic applications where high performance and environmental resistance are paramount. It is typically applied as a thin, uniform coat and allowed to dry before the application of the silicone sealant.

Key Features for Aviation:

• Single-Component: Ready to use directly from the container, requiring no mixing.
  Solvent-Based: Contains volatile solvents that evaporate after application, leaving behind the active adhesion-promoting agents.
  
• Adhesion Promoter: Specifically formulated to significantly improve the adhesion of silicone sealants (such as Flamemaster CS-3808) to various substrates.
  
• Versatile Substrate Compatibility: Effective on a wide range of materials commonly found in aerospace, including metals (aluminum, stainless steel, titanium), glass, and some plastics.
  
• Enhanced Durability: Improves the overall durability and environmental resistance of the silicone bond, particularly against moisture, temperature cycling, and fluid exposure.
  
• Fast Drying: Typically dries quickly, allowing for efficient processing and subsequent sealant application.
  
• Transparent/Clear: Usually appears colorless or slightly translucent, minimizing visual impact on the substrate.
  
• Essential for Optimal Performance: For many silicone aerospace applications, a primer like CS-9903 is critical to achieve the specified bond strength and long-term performance.

Typical Aviation Applications:

• Preparation for Silicone Sealant Application: The primary use is to prepare surfaces before applying silicone sealants like Flamemaster CS-3808. This ensures maximum adhesion and prevents delamination, particularly in:
  
• High-Temperature Sealing: Critical for sealing joints and components in engine bays, exhaust areas, or other hot zones where CS-3808 is used.
  
• Electrical Potting and Encapsulation: Enhances adhesion when potting or encapsulating sensitive electronic components and wiring with silicone for protection against moisture, vibration, and thermal stress.
  
• Environmental Sealing: Improves the bond of silicone seals on access panels, fairings, and other aircraft structures exposed to environmental elements.
  
• Bonding to Difficult Substrates: Particularly important when bonding silicone to typically challenging surfaces like certain metals (e.g., anodized aluminum, stainless steel) or glass.
  
• Repair and Overhaul: Used during MRO (Maintenance, Repair, and Overhaul) activities to ensure new silicone sealant applications achieve optimal bond strength on previously exposed or repaired surfaces.
  
• Missile and Electronic Assembly: Crucial for ensuring the integrity of silicone bonds in missile systems and other high-performance electronic 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.