Spiral Wound gaskets can be fabricated of any metal which is available in thin strip and which can be welded; therefore they can be used against virtually any corrosive medium dependent upon the choice of the metal and filler.
Theoretically, it is no longer contagious when there is no more fluid leaking from the sore, and no new blisters are forming. However, I always assume that a cold sore is contagious until it is completely healed, and to the best of my knowledge I've never transmitted the virus to anyone else. Abreva is a very good remedy. If applied when you first feel the tingle you can actually prevent the cold sore from erupting into blisters.
How Long Is Pneumonia Contagious? Bacterial pneumonia becomes less contagious when a sick individual has taken antibiotic treatment for about 1-2 days. However, for some bacteria, such as those causing tuberculosis, it may take at least 2 weeks of treatment before a person becomes less contagious. People with viral pneumonia become less contagious after their symptoms recede. However, coughing may persist for several weeks even if one is not contagious anymore.