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What is the glue on envelopes made of?

April 26, 2017answer Crafts envelopes Games glue Hobbies Recreation

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What is the glue on envelopes made of?

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I used to be in the glue industry. While “animal” glues do exist, they are not used for envelopes. The ones you lick are casein based, which comes from milk. Self-seal envelopes (glue on both flaps) are rubber based adhesive.