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The idea: developing a snug-fitting stainless steel tea filter for glass tea jugs. Borosilicate glass is an excellent material for tea jugs; stainless steel is perfect for tea filters. How to make the two delicate materials touch without compromising the precise fit? The answer is silicone. Its elasticity counters the production tolerance of glass and makes it the perfect link between the glass jug and the steel filter. The coronated silicone collar provides a tight fit between the two and protects them from scratching. Silicone is neutral in taste and odor and heat resistant.