The usual sizing materials for paper and board are acid in reaction and interfere with certain chemicals useful for flame proofing. A wax sizing material precipitated by the action of calcium chloride produced excellent water resistance in insulating board and did not interfere with the flame proofing chemicals.
Proceedings of the Iowa Academy of Science
©1941 Iowa Academy of Science, Inc.
Arnold, L. K. and McLeod, J. B.
"A Neutral Sizing Material for Insulating Board (Abstract),"
Proceedings of the Iowa Academy of Science, 48(1), 245-245.
Available at: https://scholarworks.uni.edu/pias/vol48/iss1/43