The problem

Please improve the adhesion of our epoxy primer for steel constructions. Below are 8 factors that likely affect it. Tell me which of them influence adhesion and give me the settings that maximize it. The response is pull-off adhesion in N/cm² after seven days. Higher is better. Only settings inside the ranges are allowed, and the measurements are noisy.

Column Factor Unit Low, −1 High, +1
Formulation
X01 Silane adhesion promoter % 0 2
X02 Epoxy:amine index 0.8 1.2
X05 Primer dilution % 0 15
Surface preparation
X03 Surface profile (Ra) µm 0.5 2.5
X04 Degrease time min 1 10
Application and cure
X06 Flash-off time min 5 15
X07 Dry film thickness µm 40 80
X08 Cure temperature °C 20 60

How it works

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  3. 03

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