About Us

A global leader in antimicrobial protection, Thomson Research Associates (TRA) was established in 1955 in Toronto, Canada. Today, our Ultra-Fresh and Silpure antimicrobial products are used by hundreds of manufacturers in more than 50 countries around the world.


A symbol for lasting freshness and hygiene in textiles and polymers.

Ultra Fresh


Harness the power of natural silver to inhibit bacterial growth in textiles and garments.



Who We Are

Read about Thomson Research Associates – the experts behind the Ultra-Fresh and Silpure brands. Read More

Our Lab

Demonstrate the effectiveness of your treated product in our laboratories. Read More

How We Work With You

Learn about our collaborative process. Read More

Our Brands

Discover why our customers trust Ultra-Fresh and Silpure brands. Read More


Browse frequently asked antimicrobial, antifungal, and antibacterial questions. Read More