SYMPOSIA PAPER Published: 01 January 1987
STP19395S

Selection of Wetting Adjuvants

Source

Wetting of crop foliage by aqueous emulsion sprays can be quantitatively described, and the conditions for perfect wetting can be predicted. An empirical relationship from the literature for wetting of high-energy organic surfaces has been found to be applicable to wetting of both broad leaves and grasses. A graph of the cosine of the spray droplet contact angle against the surface tension can be extrapolated to predict the surface tension necessary to achieve a zero contact angle (perfect wetting). Surfactants and emulsifiers typically used in pesticide formulations cannot reduce aqueous surface tension sufficiently to achieve a zero contact angle. Certain silicone and fluorocarbon surfactants were found to reduce aqueous surface tension sufficiently to produce a zero or near-zero contact angle.

Author Information

McKay, BM
FMC Corp., Princeton, NJ
Koch, R
FMC Corp., Princeton, NJ
Herbert, RM
FMC Corp., Princeton, NJ
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Details
Developed by Committee: E35
Pages: 27–31
DOI: 10.1520/STP19395S
ISBN-EB: 978-0-8031-5007-2
ISBN-13: 978-0-8031-0943-8