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Like all materials, stainless steel may become stained or discolored over time, impairing the overall look. This brown discoloration, tea staining, has been identified in coastal applications in Australia and overseas.
Tea staining can be defined as: Discoloration of the surface of stainless steel that does not affect the structural integrity or the longevity of the material.
Tea staining occurs most commonly within about fifty kilometres of the surf and becomes progressively worse closer to the marine source. However, wind exposure, pollution levels and higher temperatures can create environments where tea staining might occur 50 kilometres from sea water. These same factors also increase corrosion rates of alternative materials.
Exposure of a particular grade of stainless steel to a more aggressive environment than it can resist will contribute to tea staining. Grade 316 should be selected as a minimum within five kilometres of the surf. The less expensive grades (such as 304 or 430) will probably become tea stained or even suffer more severe corrosion.
The Stainless Steel Woven Mesh used in Invisi-gard Stainless Security Products is 316 Marine Grade. The excellent stain resistance of 316 Marine Grade Stainless Steel Mesh makes this grade an absolute must in harsh environments such as coastal or industrial areas. Where lesser grades will ultimately stain and corrode, the 316 Marine Grade Stainless Steel Mesh used in all Invisi-gard Stainless Steel Security Products will retain its good looks and high strength for longer.
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