Your Guide to Sourcing Custom Silicone Sponge Extrusions

What’s the most critical element of product design? It often comes down to the materials and how well they support the application.

That’s why SRP is excited to announce we now have direct access to a specialized manufacturer of silicone sponge extrusions: ​​expanSil™ by Silicone Engineering. To learn more about the features and available products in the expanSil line, visit our dedicated page, which provides all the key details. 

Customization Vs. Stock Products for Silicone Extrusions 

What’s the advantage of sourcing silicone sponge extrusions through SRP? You unlock the benefits of customization. Thanks to our direct access to expanSil™ products, all your silicone sponge extrusions are made-to-order. You can select from a wide range of shapes, widths, and colors to perfectly suit your application.

When material quality is essential, sourcing your silicone extrusions from SRP offers a superior alternative to off-the-shelf products. Unlike stock items, you can be confident that your custom extrusions meet exact specifications and are manufactured by a company with a strong reputation for quality control. Customization ensures enhanced reliability and performance, while also reducing the risk of supply disruptions.

You’ll also streamline your vendor relationships. Fewer vendors typically lead to better pricing and improved efficiency.

Getting a Quote on Custom Silicone Extrusions 

To begin your order, here’s a quick guide. Your requirements may vary depending on whether you’re working with an existing formulation already used in an application or if you’re developing a new application.

What Do I Need to Get a Quote on an Existing Extrusion? 

For a fast and accurate quote, please provide the following information: 

  1. A drawing (if available)
  2. Material specifications
  3. Color requirements 
  4. Length requirements 
  5. Per purchase quality and frequency
  6. Estimated Annual Usage (EAU) to help secure the best freight rates
  7. Current packaging method (e.g., coiled, boxed, reel or bagged)

When quoting for tubing, providing the Inner Diameter (ID) and wall thickness — rather than the ID and Outer Diameter (OD) — ensures the tubing remains concentric, maintaining a uniform wall thickness. This consistency is essential for structural integrity and reliable performance.

For extended rolls, material splicing is available to join pieces into a continuous length.

Note: Silicone Engineering does not extrude shapes with inserts (e.g., wire, metal), dual durometer shapes, or any EMI/RFI conductive materials.

What Do I need to Get a Quote on a New Extrusion? 

If you’re sourcing a custom silicone extrusion for a new application, we’ll need a few additional details beyond the basics to ensure the ideal match:

  1. A drawing 
  2. A description of the application 
  3. Material specifications including
    • Hardness 
    • Compression set 
    • Closure force 
    • Solid or sponge 
    • Adhesive (if needed)
  4. Environmental conditions, including:
    • Operating temperature 
    • Chemical resistance 
  5. For lighting applications: Light housing lens material (to assess outgassing) 

Your quote will include a recommended material based on an analysis of the information you provided, along with relevant data sheets and cross-sectional tolerances.

SRP: Your Complete Resource for Custom Materials and Components 

Whether you’re seeking a new vendor for silicone sponge extrusion or identifying the best formulation for a new application, our team is here to help. Get started your fast and accurate quote today.