What truly separates a professional brewing vessel from a simple stainless steel container? The answer lies in the surface.
Welcome to a detailed look at the CASSMAN tank polishing and passivation process—a critical, multi-stage procedure that defines the quality, cleanability, and longevity of every fermenter and brite tank we build. This isn't just about aesthetics; it's about microbial security.
A microscopically smooth interior surface is your first line of defense against spoilage organisms. In this video, we demonstrate how we achieve a sanitary finish that protects your beer and your reputation:
The Art of Mechanical Polishing: Witness our skilled technicians meticulously polishing every inch of the tank's interior. We showcase the process of achieving a mirror-like finish with a surface roughness (Ra) of ≤0.4μm, far exceeding basic standards. A lower Ra value means fewer microscopic peaks and valleys for bacteria and beerstone to hide in.
The Science of Passivation: Polishing is only half the story. We then show the crucial chemical passivation step. This process removes any free iron from the surface and rebuilds a robust, passive layer of chromium oxide—the true protective shield of stainless steel against corrosion and chemical attack.
Sanitary Welds, Seamless Finish: The video also focuses on how we grind and polish our interior welds to be perfectly flush and smooth with the parent material, eliminating any potential harborage points for microbes.
Easier, Faster, & More Effective Cleaning: A smoother surface reduces cleaning time, saves on chemical usage, and provides greater certainty in your CIP cycles.
Enhanced Beer Quality & Stability: By minimizing microbial risk and preventing metallic off-flavors, our tanks provide a neutral, stable environment for your beer.
Superior Longevity: A properly passivated tank resists corrosion and pitting, ensuring your investment lasts for decades.
A Reflection of Your Brand: The flawless finish of a CASSMAN tank is a visible testament to your own commitment to quality.
This process is a core part of the "CASSMAN Difference." It's a non-negotiable standard built into every tank because we believe your peace of mind is as important as the quality of your beer.
