Tantalum washer and screws which is a perfect metal which handles high temperature and high corrosive activities. tantalum heat exchangers which have low investment and run for longtime with low maintenance costs. Tantalum heat exchangers which are mainly used in high-corrosive environments in the chemical and pharmaceutical industries and highly corrosion-resistant to Hydrochloric acid, Nitric acid, Phosphoric acid, Strong organic acids, Bromine and theirs mixtures.