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Jeff Parker

21 posts
Packaging Science

What Paperboard Grades Actually Mean: A Plain-English Guide to ECT, Mullen and Caliper Ratings 

By Jeff Parker
August 3, 2026
Anyone who has ordered custom packaging more than once hasencountereda spec sheet full of numbers and abbreviations that nobody explains. 32 ECT. 200# Mullen. 18pt caliper. SBS. The supplier knows what these mean. The buyer oftendoesn’t, and asking…
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