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Don't forget the cost of testing anything like that to get it "certified."
Y'all know I sell custom earplugs. The silicone putty I use for that costs about $30 an ounce. Why? Because it originally cost over $100,000 to get that chemical formulation both approved by the FDA for long-term skin contact and then ANSI testing to get an official NRR sound suppression rating. It takes a long time for my company to absorb that testing expense - and they sell that putty to 2,500 dealers like me.
The cost of police and fire gear has to include all the testing expenses, too.
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