In the photo are samples that we provide to customers to show the different types of finishes available in the design and manufacturing of equipment for industries that require a high degree of sanitation.
From the left:
2B Finish: Has common corrosion resistance properties, heat resistant, smooth (not brushed) steel. The RA (roughness average) is 36 to 15 depending on the gauge of the material.
#4 Finish: Is Characterized by short, polished brushed lines and is suitable for caustic wash down procedures. The RA is from 29 – 40 depending on the gauge of the material.
Pickle Passivation: A treatment also referred to as descaling, pickle passivation removes the scale and leaves a matte finish that is free from contamination. Apache’s tests have proven an increase in RA smoothness up to 25%, compared to measurements before the material was pickle passivated.
Bead Blast: Bead blasting utilizes material such as glass, ceramic beads to produce a non-directional, textured surface with a satin appearance and low reflectivity. The finish is not necessarily smooth, depending on the process and blasting medium. RA readings are typically greater than 45.
Electropolish: Surface metal is dissolved, removing all embedded contaminants, which creates a smooth, mirror-like finish. Apache’s tests have proven to increase smoothness up to 50%, compared to measurement before the material was electropolished.
For detailed information about these finishes and processes, download our white paper “Leveraging Stainless Steel Finishes on Sanitary Equipment”.