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How much percentage (by volume) of surfactant is generally used in the surfactant compatibility test?

How much percentage (by volume) of surfactant is generally used in the surfactant compatibility test? Correct Answer 0.1 to 0.2 %

0.1 to 0.2 % (by volume) of surfactants are added to oil and water in surfactant compatibility test. The surfactant is added to the oil and water then stirred with high-speed.

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