Examples include making moisture cure products or hot melt adhesives that need to be clear and air-free when the batch is complete.
Vacuum for the most part has been overlooked when it comes to pigment dispersions because of the added purchase and maintenance expenses of vacuum-capable equipment. A few of the expensive parts of a vacuum system are sturdier vacuum tanks, seals to hold the vacuum, “O” rings on tank lids, dome lids on tanks, and vacuum pumps. For standard pigment dispersions, it did not make sense to pay extra money for vacuum equipment unless necessary. Why pull vacuum on a pigment dispersion and pay extra for equipment and maintenance if you can m
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