Passive systems rely on heat-driven convection or heat pipes to circulate water or heating fluid in the system. Passive solar water heating systems cost less and have extremely low or no maintenance, but the efficiency of a passive system is significantly lower than that of an active system.
316L Stainless Steel. 316L Stainless Steel is commonly used for jewelry because with it will not oxidize nor turn black with only minimal maintenance. Its resistance to corrosion and staining, as well as its durability and sleek look have made stainless steel body jewelry the most popular type of material for piercing enthusiasts worldwide. Our body jewelry products are made with high quality 316L Surgical Steel which is safe for all types of body piercings or implants.
This is a base metal product with an extremely thin plating layer of silver applied to the surface. Even when jewelry is described as fine silver-plated, the overall silver content is a tiny fraction of a percent. Silver-plated jewelry is affordable costume jewelry. Plating can tarnish and will eventually wear off to expose the base metal underneath. Costume jewelry will not have a quality stamp but it may bear the manufacturers logo or hallmark. 8.