What is the difference between the two types of sheet protectors, and what are mylar hinges?

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What is the difference between the two types of sheet protectors, and what are mylar hinges?

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» Lost Luggage™ makes two types of sheet protectors: polyester and polypropylene. Polyester sheet protectors have a glossy finish to their plastic surface and are open on the top and bottom. Polypropylene sheet protectors have a matte finish, are more flexible and are only open on the top. The polyester pages are technically clearer (the polypropylene pages have a slight frost in order to give them their matte quality.) Both types come standard with black filler paper and both are archival.

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