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Technical Information

Product Capabilities: Custom Trims, Seals and More

A design engineer draws plans for a custom trim productTrim-Lok is known for precise repeatability. We are also the leading manufacturer for custom rubber seals, plastic trims, custom trim molding, plastic seals and gaskets. For over 50 years, we’ve provided customers around the world with custom products they depend on.
Watch our video to learn more. Check out the ways we work to accommodate your specific needs, from research and design assistance to prototyping and custom packaging. 


Our team has a wide array of skill sets and deep industry knowledge. We are prepared to solve your unique challenges and create efficient experiences. We work closely with you to determine your goals and exact requirements and keep these considerations in mind:

  • • How will you use your product?
  • • Do you need a waterproof product?
  • • Do you need color matching or other aesthetic requirements?
  • • Does your product need to withstand high or low temperatures?
  • • Does your product need to be flame resistant or flame retardant?
  • • Will your product encounter corrosives (e.g. oils)?

Answers to these questions help our researchers determine the right material, color and compound for your custom trim or rubber seal. Our engineers may also request CAD drawings from customers to understand how a custom door trim, car molding or rubber seal functions within the design.

Design Assistance

Our highly skilled, in-house engineering team creates our own drawings with interactive software and technology. Our expert team works with the latest:

  • • CAD software
  • • Technology
  • • Design programs
  • • Quality standards

We pair high-caliber designs with excellent materials knowledge and strong manufacturing expertise to ensure our custom products meet your standards for quality, strength, appearance and functionality. Learn what to consider during the design process with our spec sheets and testing data.

Secondary Design Processes for Custom Trims and Seals

Need additional customizations for your extruded rubber seal, plastic trim or custom car molding? Our team looks for every opportunity to provide the unique methods you require, such as:

  • • Mitered corners and frame assemblies
  • • Film splicing
  • • Slip coating
  • • Custom color matching
  • • Notching
  • • O-rings
  • • In-line printing
  • • Injection molded corners

To learn more about our custom capabilities and secondary design offerings, visit page 43 in our catalog.


At Trim-Lok, we utilize rapid prototyping. We supply a tangible form of your idea and help test and validate aspects of its conceptualization quickly so refinements can be made before manufacturing begins.

Quality Control

Quality doesn’t start after your custom trim or custom rubber seal is manufactured—it starts with strong management, responsive leadership and investment in our people.
Our goal is to maintain a quality management system that meets or exceeds the requirements of IATF 16949 and ISO 9001.

Custom Packaging

Trim-Lok can provide personalized packaging options for your custom trim molding, extruded rubber seals, custom door trims and more. Our custom packaging options include:

  • • Custom boxing
  • • Custom reels
  • • Custom bagging
  • • Header cards for retail
  • • Private label

Value add is a major component of our global, day-to-day service. Explore our additional capabilities to learn more about our custom engineered solutions.


Trim-Lok provides timely and cost-efficient shipping from our West Coast and Midwest warehouse locations. Most in-stock materials and products can ship on a same-day or next-day schedule. Ready to get started? Contact a sales representative to request a custom Trim-Lok product today. 

See how Trim-Lok created custom edge protection for a large retailer.

Contact a Sales Rep